- up to 5.5.18

[packages/mysql.git] / group_commit.patch

--- a/include/my_sys.h
+++ b/include/my_sys.h
@@ -524,6 +524,8 @@
 
 #define my_b_tell(info) ((info)->pos_in_file + \
 			 (size_t) (*(info)->current_pos - (info)->request_pos))
+#define my_b_write_tell(info) ((info)->pos_in_file + \
+			       ((info)->write_pos - (info)->write_buffer))
 
 #define my_b_get_buffer_start(info) (info)->request_pos 
 #define my_b_get_bytes_in_buffer(info) (char*) (info)->read_end -   \
--- a/include/mysql/plugin.h
+++ b/include/mysql/plugin.h
@@ -559,6 +559,8 @@
 
 #define EXTENDED_FOR_USERSTAT
 
+#define EXTENDED_FOR_COMMIT_ORDERED
+
 /**
   Create a temporary file.
 
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -90,6 +90,8 @@
 static TYPELIB known_extensions= {0,"known_exts", NULL, NULL};
 uint known_extensions_id= 0;
 
+static int commit_one_phase_low(THD *thd, bool all, THD_TRANS *trans,
+                                bool is_real_trans);
 
 
 static plugin_ref ha_default_plugin(THD *thd)
@@ -1119,7 +1121,8 @@
   */
   bool is_real_trans= all || thd->transaction.all.ha_list == 0;
   Ha_trx_info *ha_info= trans->ha_list;
-  my_xid xid= thd->transaction.xid_state.xid.get_my_xid();
+  bool need_commit_ordered;
+  my_xid xid;
   DBUG_ENTER("ha_commit_trans");
 
   /*
@@ -1152,13 +1155,20 @@
     DBUG_RETURN(2);
   }
 
-  if (ha_info)
+  if (!ha_info)
+  {
+    /* Free resources and perform other cleanup even for 'empty' transactions. */
+    if (is_real_trans)
+      thd->transaction.cleanup();
+    DBUG_RETURN(0);
+  }
+  else
   {
     uint rw_ha_count;
     bool rw_trans;
     MDL_request mdl_request;
 
-    DBUG_EXECUTE_IF("crash_commit_before", DBUG_SUICIDE(););
+    DBUG_EXECUTE_IF("crash_commit_before", abort(););
 
     /* Close all cursors that can not survive COMMIT */
     if (is_real_trans)                          /* not a statement commit */
@@ -1197,57 +1207,80 @@
         !thd->slave_thread)
     {
       my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
-      ha_rollback_trans(thd, all);
-      error= 1;
-      goto end;
+      goto err;
     }
 
-    if (!trans->no_2pc && (rw_ha_count > 1))
+    if (trans->no_2pc || (rw_ha_count <= 1))
     {
-      for (; ha_info && !error; ha_info= ha_info->next())
+      error= ha_commit_one_phase(thd, all);
+      DBUG_EXECUTE_IF("crash_commit_after", DBUG_ABORT(););
+      goto end;
+    }
+
+    need_commit_ordered= FALSE;
+    xid= thd->transaction.xid_state.xid.get_my_xid();
+
+      for (Ha_trx_info *hi= ha_info; hi; hi= hi->next())
       {
         int err;
-        handlerton *ht= ha_info->ht();
+        handlerton *ht= hi->ht();
         /*
           Do not call two-phase commit if this particular
           transaction is read-only. This allows for simpler
           implementation in engines that are always read-only.
         */
-        if (! ha_info->is_trx_read_write())
+        if (! hi->is_trx_read_write())
           continue;
         /*
           Sic: we know that prepare() is not NULL since otherwise
           trans->no_2pc would have been set.
         */
-        if ((err= ht->prepare(ht, thd, all)))
-        {
-          my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
-          error= 1;
-        }
+        err= ht->prepare(ht, thd, all);
         status_var_increment(thd->status_var.ha_prepare_count);
+        if (err)
+          my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
+
+        if (err)
+          goto err;
+
+        need_commit_ordered|= (ht->commit_ordered != NULL);
       }
-      DBUG_EXECUTE_IF("crash_commit_after_prepare", DBUG_SUICIDE(););
-      if (error || (is_real_trans && xid &&
-                    (error= !(cookie= tc_log->log_xid(thd, xid)))))
+      DBUG_EXECUTE_IF("crash_commit_after_prepare", DBUG_ABORT(););
+
+      if (!is_real_trans)
       {
-        ha_rollback_trans(thd, all);
-        error= 1;
+        error= commit_one_phase_low(thd, all, trans, is_real_trans);
+        DBUG_EXECUTE_IF("crash_commit_after", DBUG_ABORT(););
         goto end;
       }
-      DBUG_EXECUTE_IF("crash_commit_after_log", DBUG_SUICIDE(););
-    }
-    error=ha_commit_one_phase(thd, all) ? (cookie ? 2 : 1) : 0;
-    DBUG_EXECUTE_IF("crash_commit_before_unlog", DBUG_SUICIDE(););
-    if (cookie)
+
+    cookie= tc_log->log_and_order(thd, xid, all, need_commit_ordered);
+    if (!cookie)
+      goto err;
+
+    DBUG_EXECUTE_IF("crash_commit_after_log", DBUG_ABORT(););
+
+    error= commit_one_phase_low(thd, all, trans, is_real_trans) ? 2 : 0;
+    DBUG_EXECUTE_IF("crash_commit_after", DBUG_ABORT(););
+    if (is_real_trans)          /* userstat.patch */
+      thd->diff_commit_trans++; /* userstat.patch */
+    RUN_HOOK(transaction, after_commit, (thd, FALSE));
+
+    DBUG_EXECUTE_IF("crash_commit_before_unlog", DBUG_ABORT(););
       if(tc_log->unlog(cookie, xid))
       {
         error= 2;
         goto end;
       }
-    DBUG_EXECUTE_IF("crash_commit_after", DBUG_SUICIDE(););
-    if (is_real_trans)
-      thd->diff_commit_trans++;
-    RUN_HOOK(transaction, after_commit, (thd, FALSE));
+
+    DBUG_EXECUTE_IF("crash_commit_after", DBUG_ABORT(););
+    goto end;
+
+    /* Come here if error and we need to rollback. */
+err:
+    error= 1;                                  /* Transaction was rolled back */
+    ha_rollback_trans(thd, all);
+
 end:
     if (rw_trans && mdl_request.ticket)
     {
@@ -1260,9 +1293,6 @@
       thd->mdl_context.release_lock(mdl_request.ticket);
     }
   }
-  /* Free resources and perform other cleanup even for 'empty' transactions. */
-  else if (is_real_trans)
-    thd->transaction.cleanup();
   DBUG_RETURN(error);
 }
 
@@ -1279,7 +1309,6 @@
 
 int ha_commit_one_phase(THD *thd, bool all)
 {
-  int error=0;
   THD_TRANS *trans=all ? &thd->transaction.all : &thd->transaction.stmt;
   /*
     "real" is a nick name for a transaction for which a commit will
@@ -1295,8 +1324,16 @@
     transaction.all.ha_list, see why in trans_register_ha()).
   */
   bool is_real_trans=all || thd->transaction.all.ha_list == 0;
-  Ha_trx_info *ha_info= trans->ha_list, *ha_info_next;
   DBUG_ENTER("ha_commit_one_phase");
+  DBUG_RETURN(commit_one_phase_low(thd, all, trans, is_real_trans));
+}
+
+static int
+commit_one_phase_low(THD *thd, bool all, THD_TRANS *trans, bool is_real_trans)
+{
+  int error= 0;
+  Ha_trx_info *ha_info= trans->ha_list, *ha_info_next;
+  DBUG_ENTER("commit_one_phase_low");
 
   if (ha_info)
   {
@@ -1894,7 +1931,16 @@
 {
   bool warn= true;
 
+  /*
+    Holding the LOCK_commit_ordered mutex ensures that we get the same
+    snapshot for all engines (including the binary log).  This allows us
+    among other things to do backups with
+    START TRANSACTION WITH CONSISTENT SNAPSHOT and
+    have a consistent binlog position.
+  */
+  mysql_mutex_lock(&LOCK_commit_ordered);
   plugin_foreach(thd, snapshot_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, &warn);
+  mysql_mutex_unlock(&LOCK_commit_ordered);
 
   /*
     Same idea as when one wants to CREATE TABLE in one engine which does not
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -756,6 +756,53 @@
      and 'real commit' mean the same event.
    */
    int  (*commit)(handlerton *hton, THD *thd, bool all);
+   /*
+     The commit_ordered() method is called prior to the commit() method, after
+     the transaction manager has decided to commit (not rollback) the
+     transaction. Unlike commit(), commit_ordered() is called only when the
+     full transaction is committed, not for each commit of statement
+     transaction in a multi-statement transaction.
+
+     Not that like prepare(), commit_ordered() is only called when 2-phase
+     commit takes place. Ie. when no binary log and only a single engine
+     participates in a transaction, one commit() is called, no
+     commit_ordered(). So engines must be prepared for this.
+
+     The calls to commit_ordered() in multiple parallel transactions is
+     guaranteed to happen in the same order in every participating
+     handler. This can be used to ensure the same commit order among multiple
+     handlers (eg. in table handler and binlog). So if transaction T1 calls
+     into commit_ordered() of handler A before T2, then T1 will also call
+     commit_ordered() of handler B before T2.
+
+     Engines that implement this method should during this call make the
+     transaction visible to other transactions, thereby making the order of
+     transaction commits be defined by the order of commit_ordered() calls.
+
+     The intention is that commit_ordered() should do the minimal amount of
+     work that needs to happen in consistent commit order among handlers. To
+     preserve ordering, calls need to be serialised on a global mutex, so
+     doing any time-consuming or blocking operations in commit_ordered() will
+     limit scalability.
+
+     Handlers can rely on commit_ordered() calls to be serialised (no two
+     calls can run in parallel, so no extra locking on the handler part is
+     required to ensure this).
+
+     Note that commit_ordered() can be called from a different thread than the
+     one handling the transaction! So it can not do anything that depends on
+     thread local storage, in particular it can not call my_error() and
+     friends (instead it can store the error code and delay the call of
+     my_error() to the commit() method).
+
+     Similarly, since commit_ordered() returns void, any return error code
+     must be saved and returned from the commit() method instead.
+
+     The commit_ordered method is optional, and can be left unset if not
+     needed in a particular handler (then there will be no ordering guarantees
+     wrt. other engines and binary log).
+   */
+   void (*commit_ordered)(handlerton *hton, THD *thd, bool all);
    int  (*rollback)(handlerton *hton, THD *thd, bool all);
    int  (*prepare)(handlerton *hton, THD *thd, bool all);
    int  (*recover)(handlerton *hton, XID *xid_list, uint len);
--- a/sql/log.cc
+++ b/sql/log.cc
@@ -49,6 +49,7 @@
 
 #include "sql_plugin.h"
 #include "rpl_handler.h"
+#include "debug_sync.h"
 
 /* max size of the log message */
 #define MAX_LOG_BUFFER_SIZE 1024
@@ -71,6 +72,25 @@
 static int binlog_rollback(handlerton *hton, THD *thd, bool all);
 static int binlog_prepare(handlerton *hton, THD *thd, bool all);
 
+static LEX_STRING const write_error_msg=
+  { C_STRING_WITH_LEN("error writing to the binary log") };
+
+static my_bool mutexes_inited;
+mysql_mutex_t LOCK_group_commit_queue;
+mysql_mutex_t LOCK_commit_ordered;
+
+static ulonglong binlog_status_var_num_commits;
+static ulonglong binlog_status_var_num_group_commits;
+
+static SHOW_VAR binlog_status_vars_detail[]=
+{
+  {"commits",
+    (char *)&binlog_status_var_num_commits, SHOW_LONGLONG},
+  {"group_commits",
+    (char *)&binlog_status_var_num_group_commits, SHOW_LONGLONG},
+  {NullS, NullS, SHOW_LONG}
+};
+
 /**
    purge logs, master and slave sides both, related error code
    convertor.
@@ -167,41 +187,6 @@
 }
 
 /*
-  Helper class to hold a mutex for the duration of the
-  block.
-
-  Eliminates the need for explicit unlocking of mutexes on, e.g.,
-  error returns.  On passing a null pointer, the sentry will not do
-  anything.
- */
-class Mutex_sentry
-{
-public:
-  Mutex_sentry(mysql_mutex_t *mutex)
-    : m_mutex(mutex)
-  {
-    if (m_mutex)
-      mysql_mutex_lock(mutex);
-  }
-
-  ~Mutex_sentry()
-  {
-    if (m_mutex)
-      mysql_mutex_unlock(m_mutex);
-#ifndef DBUG_OFF
-    m_mutex= 0;
-#endif
-  }
-
-private:
-  mysql_mutex_t *m_mutex;
-
-  // It's not allowed to copy this object in any way
-  Mutex_sentry(Mutex_sentry const&);
-  void operator=(Mutex_sentry const&);
-};
-
-/*
   Helper classes to store non-transactional and transactional data
   before copying it to the binary log.
 */
@@ -211,7 +196,8 @@
   binlog_cache_data(): m_pending(0), before_stmt_pos(MY_OFF_T_UNDEF),
   incident(FALSE), changes_to_non_trans_temp_table_flag(FALSE),
   saved_max_binlog_cache_size(0), ptr_binlog_cache_use(0),
-  ptr_binlog_cache_disk_use(0)
+  ptr_binlog_cache_disk_use(0), commit_bin_log_file_pos(0),
+  using_xa(FALSE), xa_xid(0)
   { }
   
   ~binlog_cache_data()
@@ -270,6 +256,8 @@
       variable after truncating the cache.
     */
     cache_log.disk_writes= 0;
+    using_xa= FALSE;
+    commit_bin_log_file_pos= 0;
     DBUG_ASSERT(empty());
   }
 
@@ -411,6 +399,20 @@
  
   binlog_cache_data& operator=(const binlog_cache_data& info);
   binlog_cache_data(const binlog_cache_data& info);
+
+public:
+  /*
+    Binlog position after current commit, available to storage engines during
+    commit_ordered() and commit().
+  */
+  ulonglong commit_bin_log_file_pos;
+
+  /*
+    Flag set true if this transaction is committed with log_xid() as part of
+    XA, false if not.
+  */
+  bool using_xa;
+  my_xid xa_xid;
 };
 
 class binlog_cache_mngr {
@@ -1627,7 +1629,7 @@
 */
 static inline int
 binlog_flush_cache(THD *thd, binlog_cache_data* cache_data, Log_event *end_evt,
-                   bool is_transactional)
+                   bool is_transactional, bool all)
 {
   DBUG_ENTER("binlog_flush_cache");
   int error= 0;
@@ -1646,8 +1648,8 @@
       were, we would have to ensure that we're not ending a statement
       inside a stored function.
     */
-    error= mysql_bin_log.write(thd, &cache_data->cache_log, end_evt,
-                               cache_data->has_incident());
+    error= mysql_bin_log.write_transaction_to_binlog(thd, cache_data,
+                                                     end_evt, all);
   }
   cache_data->reset();
 
@@ -1666,12 +1668,12 @@
 */
 static inline int
 binlog_commit_flush_stmt_cache(THD *thd,
-                               binlog_cache_mngr *cache_mngr)
+                               binlog_cache_mngr *cache_mngr, bool all)
 {
   Query_log_event end_evt(thd, STRING_WITH_LEN("COMMIT"),
                           FALSE, FALSE, TRUE, 0);
   return (binlog_flush_cache(thd, &cache_mngr->stmt_cache, &end_evt,
-                             FALSE));
+                             FALSE, all));
 }
 
 /**
@@ -1684,12 +1686,12 @@
     nonzero if an error pops up when flushing the cache.
 */
 static inline int
-binlog_commit_flush_trx_cache(THD *thd, binlog_cache_mngr *cache_mngr)
+binlog_commit_flush_trx_cache(THD *thd, binlog_cache_mngr *cache_mngr, bool all)
 {
   Query_log_event end_evt(thd, STRING_WITH_LEN("COMMIT"),
                           TRUE, FALSE, TRUE, 0);
   return (binlog_flush_cache(thd, &cache_mngr->trx_cache, &end_evt,
-                             TRUE));
+                             TRUE, all));
 }
 
 /**
@@ -1702,12 +1704,12 @@
     nonzero if an error pops up when flushing the cache.
 */
 static inline int
-binlog_rollback_flush_trx_cache(THD *thd, binlog_cache_mngr *cache_mngr)
+binlog_rollback_flush_trx_cache(THD *thd, binlog_cache_mngr *cache_mngr, bool all)
 {
   Query_log_event end_evt(thd, STRING_WITH_LEN("ROLLBACK"),
                           TRUE, FALSE, TRUE, 0);
   return (binlog_flush_cache(thd, &cache_mngr->trx_cache, &end_evt,
-                             TRUE));
+                             TRUE, all));
 }
 
 /**
@@ -1722,11 +1724,11 @@
 */
 static inline int
 binlog_commit_flush_trx_cache(THD *thd, binlog_cache_mngr *cache_mngr,
-                              my_xid xid)
+                              my_xid xid, bool all)
 {
   Xid_log_event end_evt(thd, xid);
   return (binlog_flush_cache(thd, &cache_mngr->trx_cache, &end_evt,
-                             TRUE));
+                             TRUE, all));
 }
 
 /**
@@ -1788,7 +1790,7 @@
     do nothing.
     just pretend we can do 2pc, so that MySQL won't
     switch to 1pc.
-    real work will be done in MYSQL_BIN_LOG::log_xid()
+    real work will be done in MYSQL_BIN_LOG::log_and_order()
   */
   return 0;
 }
@@ -1821,7 +1823,7 @@
 
   if (!cache_mngr->stmt_cache.empty())
   {
-    error= binlog_commit_flush_stmt_cache(thd, cache_mngr);
+    error= binlog_commit_flush_stmt_cache(thd, cache_mngr, all);
   }
 
   if (cache_mngr->trx_cache.empty())
@@ -1840,7 +1842,7 @@
     Otherwise, we accumulate the changes.
   */
   if (!error && ending_trans(thd, all))
-    error= binlog_commit_flush_trx_cache(thd, cache_mngr);
+    error= binlog_commit_flush_trx_cache(thd, cache_mngr, all);
 
   /*
     This is part of the stmt rollback.
@@ -1884,7 +1886,7 @@
   }
   else if (!cache_mngr->stmt_cache.empty())
   {
-    error= binlog_commit_flush_stmt_cache(thd, cache_mngr);
+    error= binlog_commit_flush_stmt_cache(thd, cache_mngr, all);
   }
 
   if (cache_mngr->trx_cache.empty())
@@ -1932,7 +1934,7 @@
          (trans_has_updated_non_trans_table(thd) &&
           ending_single_stmt_trans(thd,all) &&
           thd->variables.binlog_format == BINLOG_FORMAT_MIXED)))
-      error= binlog_rollback_flush_trx_cache(thd, cache_mngr);
+      error= binlog_rollback_flush_trx_cache(thd, cache_mngr, all);
     /*
       Truncate the cache if:
         . aborting a single or multi-statement transaction or;
@@ -2907,6 +2909,7 @@
 MYSQL_BIN_LOG::MYSQL_BIN_LOG(uint *sync_period)
   :bytes_written(0), prepared_xids(0), file_id(1), open_count(1),
    need_start_event(TRUE),
+   group_commit_queue(0), num_commits(0), num_group_commits(0),
    sync_period_ptr(sync_period),
    is_relay_log(0), signal_cnt(0),
    description_event_for_exec(0), description_event_for_queue(0)
@@ -5279,19 +5282,15 @@
   SYNOPSIS
     write_cache()
     cache    Cache to write to the binary log
-    lock_log True if the LOCK_log mutex should be aquired, false otherwise
-    sync_log True if the log should be flushed and synced
 
   DESCRIPTION
     Write the contents of the cache to the binary log. The cache will
     be reset as a READ_CACHE to be able to read the contents from it.
  */
 
-int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache,
-                               bool lock_log, bool sync_log)
+int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
 {
-  Mutex_sentry sentry(lock_log ? &LOCK_log : NULL);
-
+  mysql_mutex_assert_owner(&LOCK_log);
   if (reinit_io_cache(cache, READ_CACHE, 0, 0, 0))
     return ER_ERROR_ON_WRITE;
   uint length= my_b_bytes_in_cache(cache), group, carry, hdr_offs;
@@ -5402,6 +5401,8 @@
     }
 
     /* Write data to the binary log file */
+    DBUG_EXECUTE_IF("fail_binlog_write_1",
+                    errno= 28; return ER_ERROR_ON_WRITE;);
     if (my_b_write(&log_file, cache->read_pos, length))
       return ER_ERROR_ON_WRITE;
     thd->binlog_bytes_written+= length;
@@ -5410,9 +5411,6 @@
 
   DBUG_ASSERT(carry == 0);
 
-  if (sync_log)
-    return flush_and_sync(0);
-
   return 0;                                     // All OK
 }
 
@@ -5453,8 +5451,6 @@
   if (!is_open())
     DBUG_RETURN(error);
 
-  LEX_STRING const write_error_msg=
-    { C_STRING_WITH_LEN("error writing to the binary log") };
   Incident incident= INCIDENT_LOST_EVENTS;
   Incident_log_event ev(thd, incident, write_error_msg);
   if (lock)
@@ -5496,104 +5492,320 @@
     'cache' needs to be reinitialized after this functions returns.
 */
 
-bool MYSQL_BIN_LOG::write(THD *thd, IO_CACHE *cache, Log_event *commit_event,
-                          bool incident)
+bool
+MYSQL_BIN_LOG::write_transaction_to_binlog(THD *thd, binlog_cache_data *cache_data,
+                                           Log_event *end_ev, bool all)
 {
-  DBUG_ENTER("MYSQL_BIN_LOG::write(THD *, IO_CACHE *, Log_event *)");
+  group_commit_entry entry;
+  bool ret;
+  DBUG_ENTER("MYSQL_BIN_LOG::write_transaction_to_binlog");
+
+  entry.thd= thd;
+  entry.cache_data= cache_data;
+  entry.error= 0;
+  entry.all= all;
+
+  /*
+    Log "BEGIN" at the beginning of every transaction.  Here, a transaction is
+    either a BEGIN..COMMIT block or a single statement in autocommit mode.
+
+    Create the necessary events here, where we have the correct THD (and
+    thread context).
+
+    Due to group commit the actual writing to binlog may happen in a different
+    thread.
+  */
+  Query_log_event qinfo(thd, STRING_WITH_LEN("BEGIN"), TRUE, FALSE, TRUE, 0);
+  entry.begin_event= &qinfo;
+  entry.end_event= end_ev;
+  if (cache_data->has_incident())
+  {
+    Incident_log_event inc_ev(thd, INCIDENT_LOST_EVENTS, write_error_msg);
+    entry.incident_event= &inc_ev;
+    ret = write_transaction_to_binlog_events(&entry);
+  }
+  else
+  {
+    entry.incident_event= NULL;
+    ret = write_transaction_to_binlog_events(&entry);
+  }
+  if (!ret)                                          /* userstat.patch */
+    thd->binlog_bytes_written += qinfo.data_written; /* userstat.patch */
+  DBUG_RETURN(ret);
+}
+
+bool
+MYSQL_BIN_LOG::write_transaction_to_binlog_events(group_commit_entry *entry)
+{
+  /*
+    To facilitate group commit for the binlog, we first queue up ourselves in
+    the group commit queue. Then the first thread to enter the queue waits for
+    the LOCK_log mutex, and commits for everyone in the queue once it gets the
+    lock. Any other threads in the queue just wait for the first one to finish
+    the commit and wake them up.
+  */
+  entry->thd->clear_wakeup_ready();
+  mysql_mutex_lock(&LOCK_group_commit_queue);
+  group_commit_entry *orig_queue= group_commit_queue;
+  entry->next= orig_queue;
+  group_commit_queue= entry;
+  DEBUG_SYNC(entry->thd, "commit_group_commit_queue");
+  mysql_mutex_unlock(&LOCK_group_commit_queue);
+
+  /*
+    The first in the queue handle group commit for all; the others just wait
+    to be signalled when group commit is done.
+  */
+  if (orig_queue != NULL)
+    entry->thd->wait_for_wakeup_ready();
+  else
+    trx_group_commit_leader(entry);
+
+  if (likely(!entry->error))
+    return 0;
+
+  switch (entry->error)
+  {
+  case ER_ERROR_ON_WRITE:
+    my_error(ER_ERROR_ON_WRITE, MYF(ME_NOREFRESH), name, entry->commit_errno);
+    break;
+  case ER_ERROR_ON_READ:
+    my_error(ER_ERROR_ON_READ, MYF(ME_NOREFRESH),
+             entry->cache_data->cache_log.file_name, entry->commit_errno);
+    break;
+  default:
+    /*
+      There are not (and should not be) any errors thrown not covered above.
+      But just in case one is added later without updating the above switch
+      statement, include a catch-all.
+    */
+    my_printf_error(entry->error,
+                    "Error writing transaction to binary log: %d",
+                    MYF(ME_NOREFRESH), entry->error);
+  }
+
+  /*
+    Since we return error, this transaction XID will not be committed, so
+    we need to mark it as not needed for recovery (unlog() is not called
+    for a transaction if log_xid() fails).
+  */
+  if (entry->cache_data->using_xa && entry->cache_data->xa_xid)
+    mark_xid_done();
+
+  return 1;
+}
+
+/*
+  Do binlog group commit as the lead thread.
+
+  This must be called when this thread/transaction is queued at the start of
+  the group_commit_queue. It will wait to obtain the LOCK_log mutex, then group
+  commit all the transactions in the queue (more may have entered while waiting
+  for LOCK_log). After commit is done, all other threads in the queue will be
+  signalled.
+
+ */
+void
+MYSQL_BIN_LOG::trx_group_commit_leader(group_commit_entry *leader)
+{
+  DBUG_ENTER("MYSQL_BIN_LOG::trx_group_commit_leader");
+  uint xid_count= 0;
+  uint write_count= 0;
+
+  /*
+    Lock the LOCK_log(), and once we get it, collect any additional writes
+    that queued up while we were waiting.
+  */
   mysql_mutex_lock(&LOCK_log);
+  DEBUG_SYNC(leader->thd, "commit_after_get_LOCK_log");
+  mysql_mutex_lock(&LOCK_group_commit_queue);
+  group_commit_entry *current= group_commit_queue;
+  group_commit_queue= NULL;
+  mysql_mutex_unlock(&LOCK_group_commit_queue);
+
+  /* As the queue is in reverse order of entering, reverse it. */
+  group_commit_entry *queue= NULL;
+  while (current)
+  {
+    group_commit_entry *next= current->next;
+    current->next= queue;
+    queue= current;
+    current= next;
+  }
+  DBUG_ASSERT(leader == queue /* the leader should be first in queue */);
 
+  /* Now we have in queue the list of transactions to be committed in order. */
   DBUG_ASSERT(is_open());
   if (likely(is_open()))                       // Should always be true
   {
     /*
-      We only bother to write to the binary log if there is anything
-      to write.
-     */
-    if (my_b_tell(cache) > 0)
+      Commit every transaction in the queue.
+
+      Note that we are doing this in a different thread than the one running
+      the transaction! So we are limited in the operations we can do. In
+      particular, we cannot call my_error() on behalf of a transaction, as
+      that obtains the THD from thread local storage. Instead, we must set
+      current->error and let the thread do the error reporting itself once
+      we wake it up.
+    */
+    for (current= queue; current != NULL; current= current->next)
     {
+      binlog_cache_data *cache_data= current->cache_data;
+      IO_CACHE *cache= &cache_data->cache_log;
+
       /*
-        Log "BEGIN" at the beginning of every transaction.  Here, a
-        transaction is either a BEGIN..COMMIT block or a single
-        statement in autocommit mode.
+        We only bother to write to the binary log if there is anything
+        to write.
       */
-      Query_log_event qinfo(thd, STRING_WITH_LEN("BEGIN"), TRUE, FALSE, TRUE, 0);
-      if (qinfo.write(&log_file))
-        goto err;
-      thd->binlog_bytes_written+= qinfo.data_written;
-      DBUG_EXECUTE_IF("crash_before_writing_xid",
-                      {
-                        if ((write_error= write_cache(thd, cache, false, true)))
-                          DBUG_PRINT("info", ("error writing binlog cache: %d",
-                                               write_error));
-                        DBUG_PRINT("info", ("crashing before writing xid"));
-                        DBUG_SUICIDE();
-                      });
+      if (my_b_tell(cache) > 0)
+      {
+        if ((current->error= write_transaction(current)))
+          current->commit_errno= errno;
 
-      if ((write_error= write_cache(thd, cache, false, false)))
-        goto err;
+        write_count++;
+      }
 
-      if (commit_event && commit_event->write(&log_file))
-        goto err;
-      if (commit_event)
-        thd->binlog_bytes_written+= commit_event->data_written;
+      cache_data->commit_bin_log_file_pos= my_b_write_tell(&log_file);
+      if (cache_data->using_xa && cache_data->xa_xid)
+        xid_count++;
+    }
 
-      if (incident && write_incident(thd, FALSE))
-        goto err;
 
+    if (write_count > 0)
+    {
       bool synced= 0;
       if (flush_and_sync(&synced))
-        goto err;
-      DBUG_EXECUTE_IF("half_binlogged_transaction", DBUG_SUICIDE(););
-      if (cache->error)				// Error on read
       {
-        sql_print_error(ER(ER_ERROR_ON_READ), cache->file_name, errno);
-        write_error=1;				// Don't give more errors
-        goto err;
+        for (current= queue; current != NULL; current= current->next)
+        {
+          if (!current->error)
+          {
+            current->error= ER_ERROR_ON_WRITE;
+            current->commit_errno= errno;
+          }
+        }
+      }
+      else
+      {
+        signal_update();
       }
 
       if (RUN_HOOK(binlog_storage, after_flush,
-                   (thd, log_file_name, log_file.pos_in_file, synced)))
+                   (leader->thd, log_file_name, log_file.pos_in_file, synced)))
       {
         sql_print_error("Failed to run 'after_flush' hooks");
-        write_error=1;
-        goto err;
+        for (current= queue; current != NULL; current= current->next)
+        {
+          if (!current->error)
+          {
+            current->error= ER_ERROR_ON_WRITE;
+            current->commit_errno= errno;
+          }
+        }
       }
 
-      signal_update();
     }
 
     /*
-      if commit_event is Xid_log_event, increase the number of
-      prepared_xids (it's decreasd in ::unlog()). Binlog cannot be rotated
+      if any commit_events are Xid_log_event, increase the number of
+      prepared_xids (it's decreased in ::unlog()). Binlog cannot be rotated
       if there're prepared xids in it - see the comment in new_file() for
       an explanation.
-      If the commit_event is not Xid_log_event (then it's a Query_log_event)
-      rotate binlog, if necessary.
+      If no Xid_log_events (then it's all Query_log_event) rotate binlog,
+      if necessary.
     */
-    if (commit_event && commit_event->get_type_code() == XID_EVENT)
+    if (xid_count > 0)
     {
-      mysql_mutex_lock(&LOCK_prep_xids);
-      prepared_xids++;
-      mysql_mutex_unlock(&LOCK_prep_xids);
+      mark_xids_active(xid_count);
     }
     else
       if (rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED))
-        goto err;
+      {
+        for (current= queue; current != NULL; current= current->next)
+        {
+          if (!current->error)
+          {
+            current->error= ER_ERROR_ON_WRITE;
+            current->commit_errno= errno;
+          }
+        }
+      }
   }
+  DEBUG_SYNC(leader->thd, "commit_before_get_LOCK_commit_ordered");
+  mysql_mutex_lock(&LOCK_commit_ordered);
+  /*
+    We cannot unlock LOCK_log until we have locked LOCK_commit_ordered;
+    otherwise scheduling could allow the next group commit to run ahead of us,
+    messing up the order of commit_ordered() calls. But as soon as
+    LOCK_commit_ordered is obtained, we can let the next group commit start.
+  */
   mysql_mutex_unlock(&LOCK_log);
+  DEBUG_SYNC(leader->thd, "commit_after_release_LOCK_log");
+  ++num_group_commits;
 
-  DBUG_RETURN(0);
-
-err:
-  if (!write_error)
+  /*
+    Wakeup each participant waiting for our group commit, first calling the
+    commit_ordered() methods for any transactions doing 2-phase commit.
+  */
+  current= queue;
+  while (current != NULL)
   {
-    write_error= 1;
-    sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
+    group_commit_entry *next;
+
+    DEBUG_SYNC(leader->thd, "commit_loop_entry_commit_ordered");
+    ++num_commits;
+    if (current->cache_data->using_xa && !current->error)
+      run_commit_ordered(current->thd, current->all);
+
+    /*
+      Careful not to access current->next after waking up the other thread! As
+      it may change immediately after wakeup.
+    */
+    next= current->next;
+    if (current != leader)                      // Don't wake up ourself
+      current->thd->signal_wakeup_ready();
+    current= next;
   }
-  mysql_mutex_unlock(&LOCK_log);
-  DBUG_RETURN(1);
+  DEBUG_SYNC(leader->thd, "commit_after_group_run_commit_ordered");
+  mysql_mutex_unlock(&LOCK_commit_ordered);
+
+  DBUG_VOID_RETURN;
 }
 
+int
+MYSQL_BIN_LOG::write_transaction(group_commit_entry *entry)
+{
+  binlog_cache_data *cache_data= entry->cache_data;
+  IO_CACHE *cache= &cache_data->cache_log;
+
+  if (entry->begin_event->write(&log_file))
+    return ER_ERROR_ON_WRITE;
+
+  DBUG_EXECUTE_IF("crash_before_writing_xid",
+                  {
+                    if ((write_cache(entry->thd, cache)))
+                      DBUG_PRINT("info", ("error writing binlog cache"));
+                    else
+                      flush_and_sync(0);
+
+                    DBUG_PRINT("info", ("crashing before writing xid"));
+                    abort();
+                  });
+
+  if (write_cache(entry->thd, cache))
+    return ER_ERROR_ON_WRITE;
+
+  if (entry->end_event->write(&log_file))
+    return ER_ERROR_ON_WRITE;
+
+  if (entry->incident_event && entry->incident_event->write(&log_file))
+    return ER_ERROR_ON_WRITE;
+
+  if (cache->error)                           // Error on read
+    return ER_ERROR_ON_READ;
+
+  return 0;
+}
 
 /**
   Wait until we get a signal that the relay log has been updated.
@@ -5999,6 +6211,68 @@
 }
 
 
+void
+TC_init()
+{
+  mysql_mutex_init(key_LOCK_group_commit_queue, &LOCK_group_commit_queue, MY_MUTEX_INIT_SLOW);
+  mysql_mutex_init(key_LOCK_commit_ordered, &LOCK_commit_ordered, MY_MUTEX_INIT_SLOW);
+  mutexes_inited= TRUE;
+}
+
+
+void
+TC_destroy()
+{
+  if (mutexes_inited)
+  {
+    mysql_mutex_destroy(&LOCK_group_commit_queue);
+    mysql_mutex_destroy(&LOCK_commit_ordered);
+    mutexes_inited= FALSE;
+  }
+}
+
+
+void
+TC_LOG::run_commit_ordered(THD *thd, bool all)
+{
+  Ha_trx_info *ha_info=
+    all ? thd->transaction.all.ha_list : thd->transaction.stmt.ha_list;
+
+  mysql_mutex_assert_owner(&LOCK_commit_ordered);
+  for (; ha_info; ha_info= ha_info->next())
+  {
+    handlerton *ht= ha_info->ht();
+    if (!ht->commit_ordered)
+      continue;
+    ht->commit_ordered(ht, thd, all);
+    DEBUG_SYNC(thd, "commit_after_run_commit_ordered");
+  }
+}
+
+int TC_LOG_MMAP::log_and_order(THD *thd, my_xid xid, bool all,
+                               bool need_commit_ordered)
+{
+  int cookie;
+
+  cookie= 0;
+  if (xid)
+    cookie= log_one_transaction(xid);
+
+  if (need_commit_ordered)
+  {
+    /* Only run commit_ordered() if log_xid was successful. */
+    if (cookie)
+    {
+      mysql_mutex_lock(&LOCK_commit_ordered);
+      run_commit_ordered(thd, all);
+      mysql_mutex_unlock(&LOCK_commit_ordered);
+    }
+  }
+
+  return cookie;
+}
+
+
 /********* transaction coordinator log for 2pc - mmap() based solution *******/
 
 /*
@@ -6135,6 +6409,7 @@
   mysql_mutex_init(key_LOCK_pool, &LOCK_pool, MY_MUTEX_INIT_FAST);
   mysql_cond_init(key_COND_active, &COND_active, 0);
   mysql_cond_init(key_COND_pool, &COND_pool, 0);
+  mysql_cond_init(key_COND_queue_busy, &COND_queue_busy, 0);
 
   inited=6;
 
@@ -6142,6 +6417,8 @@
   active=pages;
   pool=pages+1;
   pool_last=pages+npages-1;
+  commit_ordered_queue= NULL;
+  commit_ordered_queue_busy= false;
 
   return 0;
 
@@ -6247,7 +6524,7 @@
     to the position in memory where xid was logged to.
 */
 
-int TC_LOG_MMAP::log_xid(THD *thd, my_xid xid)
+int TC_LOG_MMAP::log_one_transaction(my_xid xid)
 {
   int err;
   PAGE *p;
@@ -6386,7 +6663,9 @@
     mysql_mutex_destroy(&LOCK_sync);
     mysql_mutex_destroy(&LOCK_active);
     mysql_mutex_destroy(&LOCK_pool);
+    mysql_cond_destroy(&COND_active);
     mysql_cond_destroy(&COND_pool);
+    mysql_cond_destroy(&COND_queue_busy);
   case 5:
     data[0]='A'; // garble the first (signature) byte, in case mysql_file_delete fails
   case 4:
@@ -6596,42 +6875,87 @@
   mysql_cond_destroy(&COND_prep_xids);
 }
 
-/**
-  @todo
-  group commit
+/*
+  Do a binlog log_xid() for a group of transactions, linked through
+  thd->next_commit_ordered.
 
   @retval
     0    error
   @retval
     1    success
 */
-int TC_LOG_BINLOG::log_xid(THD *thd, my_xid xid)
+int TC_LOG_BINLOG::log_and_order(THD *thd, my_xid xid, bool all,
+                                 bool need_commit_ordered __attribute__((unused)))
 {
-  DBUG_ENTER("TC_LOG_BINLOG::log");
+  DBUG_ENTER("TC_LOG_BINLOG::log_and_order");
   binlog_cache_mngr *cache_mngr=
     (binlog_cache_mngr*) thd_get_ha_data(thd, binlog_hton);
+
+  cache_mngr->trx_cache.using_xa= TRUE;
+  cache_mngr->trx_cache.xa_xid= xid;
   /*
     We always commit the entire transaction when writing an XID. Also
     note that the return value is inverted.
    */
-  DBUG_RETURN(!binlog_commit_flush_stmt_cache(thd, cache_mngr) &&
-              !binlog_commit_flush_trx_cache(thd, cache_mngr, xid));
+  DBUG_RETURN(!binlog_commit_flush_stmt_cache(thd, cache_mngr, all) &&
+              !binlog_commit_flush_trx_cache(thd, cache_mngr, xid, all));
 }
 
-int TC_LOG_BINLOG::unlog(ulong cookie, my_xid xid)
+/*
+  After an XID is logged, we need to hold on to the current binlog file until
+  it is fully committed in the storage engine. The reason is that crash
+  recovery only looks at the latest binlog, so we must make sure there are no
+  outstanding prepared (but not committed) transactions before rotating the
+  binlog.
+
+  To handle this, we keep a count of outstanding XIDs. This function is used
+  to increase this count when committing one or more transactions to the
+  binary log.
+*/
+void
+TC_LOG_BINLOG::mark_xids_active(uint xid_count)
 {
-  DBUG_ENTER("TC_LOG_BINLOG::unlog");
+  DBUG_ENTER("TC_LOG_BINLOG::mark_xids_active");
+  DBUG_PRINT("info", ("xid_count=%u", xid_count));
+  mysql_mutex_lock(&LOCK_prep_xids);
+  prepared_xids+= xid_count;
+  mysql_mutex_unlock(&LOCK_prep_xids);
+  DBUG_VOID_RETURN;
+}
+
+/*
+  Once an XID is committed, it is safe to rotate the binary log, as it can no
+  longer be needed during crash recovery.
+
+  This function is called to mark an XID this way. It needs to decrease the
+  count of pending XIDs, and signal the log rotator thread when it reaches zero.
+*/
+void
+TC_LOG_BINLOG::mark_xid_done()
+{
+  my_bool send_signal;
+
+  DBUG_ENTER("TC_LOG_BINLOG::mark_xid_done");
   mysql_mutex_lock(&LOCK_prep_xids);
   // prepared_xids can be 0 if the transaction had ignorable errors.
   DBUG_ASSERT(prepared_xids >= 0);
   if (prepared_xids > 0)
     prepared_xids--;
-  if (prepared_xids == 0) {
+  send_signal= (prepared_xids == 0);
+  mysql_mutex_unlock(&LOCK_prep_xids);
+  if (send_signal) {
     DBUG_PRINT("info", ("prepared_xids=%lu", prepared_xids));
     mysql_cond_signal(&COND_prep_xids);
   }
-  mysql_mutex_unlock(&LOCK_prep_xids);
-  DBUG_RETURN(rotate_and_purge(0));     // as ::write() did not rotate
+  DBUG_VOID_RETURN;
+}
+
+int TC_LOG_BINLOG::unlog(ulong cookie, my_xid xid)
+{
+  DBUG_ENTER("TC_LOG_BINLOG::unlog");
+  if (xid)
+    mark_xid_done();
+  DBUG_RETURN(rotate_and_purge(0));
 }
 
 int TC_LOG_BINLOG::recover(IO_CACHE *log, Format_description_log_event *fdle)
@@ -6700,9 +7024,67 @@
 {
   return (ulonglong) mysql_bin_log.get_log_file()->pos_in_file;
 }
+/*
+  Get the current position of the MySQL binlog for transaction currently being
+  committed.
+
+  This is valid to call from within storage engine commit_ordered() and
+  commit() methods only.
+
+  Since it stores the position inside THD, it is safe to call without any
+  locking.
+
+  Note that currently the binlog file name is not stored inside THD, but this
+  is still safe as it can only change when the log is rotated, and we never
+  rotate the binlog while commits are pending inside storage engines.
+*/
+extern "C"
+void mysql_bin_log_commit_pos(THD *thd, ulonglong *out_pos, const char **out_file)
+{
+  binlog_cache_mngr *cache_mngr;
+  if (binlog_hton->state == SHOW_OPTION_YES
+      && (cache_mngr= (binlog_cache_mngr*) thd_get_ha_data(thd, binlog_hton)))
+  {
+    *out_pos= cache_mngr->trx_cache.commit_bin_log_file_pos;
+    *out_file= mysql_bin_log.get_log_fname();
+  }
+  else
+  {
+    *out_pos= NULL;
+    *out_file= NULL;
+  }
+}
 #endif /* INNODB_COMPATIBILITY_HOOKS */
 
 
+static int show_binlog_vars(THD *thd, SHOW_VAR *var, char *buff)
+{
+  mysql_bin_log.set_status_variables();
+  var->type= SHOW_ARRAY;
+  var->value= (char *)&binlog_status_vars_detail;
+  return 0;
+}
+
+static SHOW_VAR binlog_status_vars_top[]= {
+  {"binlog", (char *) &show_binlog_vars, SHOW_FUNC},
+  {NullS, NullS, SHOW_LONG}
+};
+
+/*
+  Copy out current values of status variables, for SHOW STATUS or
+  information_schema.global_status.
+
+  This is called only under LOCK_status, so we can fill in a static array.
+*/
+void
+TC_LOG_BINLOG::set_status_variables()
+{
+  mysql_mutex_lock(&LOCK_commit_ordered);
+  binlog_status_var_num_commits= this->num_commits;
+  binlog_status_var_num_group_commits= this->num_group_commits;
+  mysql_mutex_unlock(&LOCK_commit_ordered);
+}
+
 struct st_mysql_storage_engine binlog_storage_engine=
 { MYSQL_HANDLERTON_INTERFACE_VERSION };
 
@@ -6717,7 +7099,7 @@
   binlog_init, /* Plugin Init */
   NULL, /* Plugin Deinit */
   0x0100 /* 1.0 */,
-  NULL,                       /* status variables                */
+  binlog_status_vars_top,     /* status variables                */
   NULL,                       /* system variables                */
   NULL,                       /* config options                  */
   0,                          /* flags                           */
--- a/sql/log.h
+++ b/sql/log.h
@@ -44,17 +44,42 @@
 
   virtual int open(const char *opt_name)=0;
   virtual void close()=0;
-  virtual int log_xid(THD *thd, my_xid xid)=0;
+  virtual int log_and_order(THD *thd, my_xid xid, bool all,
+                            bool need_commit_ordered)=0;
   virtual int unlog(ulong cookie, my_xid xid)=0;
+
+  protected:
+  void run_commit_ordered(THD *thd, bool all);
 };
 
+/*
+  Locks used to ensure serialised execution of
+  TC_LOG::run_commit_ordered(), or any other code that calls handler
+  commit_ordered() methods.
+*/
+extern mysql_mutex_t LOCK_group_commit_queue;
+extern mysql_mutex_t LOCK_commit_ordered;
+
+extern void TC_init();
+extern void TC_destroy();
+
 class TC_LOG_DUMMY: public TC_LOG // use it to disable the logging
 {
 public:
   TC_LOG_DUMMY() {}
   int open(const char *opt_name)        { return 0; }
   void close()                          { }
-  int log_xid(THD *thd, my_xid xid)         { return 1; }
+  /*
+    TC_LOG_DUMMY is only used when there are <= 1 XA-capable engines, and we
+    only use internal XA during commit when >= 2 XA-capable engines
+    participate.
+  */
+  int log_and_order(THD *thd, my_xid xid, bool all,
+                    bool need_commit_ordered)
+  {
+    DBUG_ASSERT(0 /* Internal error - TC_LOG_DUMMY::log_and_order() called */);
+    return 1;
+  }
   int unlog(ulong cookie, my_xid xid)  { return 0; }
 };
 
@@ -80,6 +105,13 @@
     mysql_cond_t  cond; // to wait for a sync
   } PAGE;
 
+  /* List of THDs for which to invoke commit_ordered(), in order. */
+  struct commit_entry
+  {
+    struct commit_entry *next;
+    THD *thd;
+  };
+
   char logname[FN_REFLEN];
   File fd;
   my_off_t file_length;
@@ -94,16 +126,38 @@
   */
   mysql_mutex_t LOCK_active, LOCK_pool, LOCK_sync;
   mysql_cond_t COND_pool, COND_active;
+  /*
+    Queue of threads that need to call commit_ordered().
+    Access to this queue must be protected by LOCK_group_commit_queue
+  */
+  commit_entry *commit_ordered_queue;
+  /*
+    This flag and condition is used to reserve the queue while threads in it
+    each run the commit_ordered() methods one after the other. Only once the
+    last commit_ordered() in the queue is done can we start on a new queue
+    run.
+
+    Since we start this process in the first thread in the queue and finish in
+    the last (and possibly different) thread, we need a condition variable for
+    this (we cannot unlock a mutex in a different thread than the one who
+    locked it).
+
+    The condition is used together with the LOCK_group_commit_queue mutex.
+  */
+  my_bool commit_ordered_queue_busy;
+  mysql_cond_t COND_queue_busy;
 
   public:
   TC_LOG_MMAP(): inited(0) {}
   int open(const char *opt_name);
   void close();
-  int log_xid(THD *thd, my_xid xid);
+  int log_and_order(THD *thd, my_xid xid, bool all,
+                    bool need_commit_ordered);
   int unlog(ulong cookie, my_xid xid);
   int recover();
 
   private:
+  int log_one_transaction(my_xid xid);
   void get_active_from_pool();
   int sync();
   int overflow();
@@ -271,9 +325,31 @@
   time_t last_time;
 };
 
+class binlog_cache_data;
 class MYSQL_BIN_LOG: public TC_LOG, private MYSQL_LOG
 {
  private:
+  struct group_commit_entry
+  {
+    struct group_commit_entry *next;
+    THD *thd;
+    binlog_cache_data *cache_data;
+    /*
+      Extra events (BEGIN, COMMIT/ROLLBACK/XID, and possibly INCIDENT) to be
+      written during group commit. The incident_event is only valid if
+      trx_data->has_incident() is true.
+    */
+    Log_event *begin_event;
+    Log_event *end_event;
+    Log_event *incident_event;
+    /* Set during group commit to record any per-thread error. */
+    int error;
+    int commit_errno;
+    /* This is the `all' parameter for ha_commit_ordered(). */
+    bool all;
+    /* True if we come in through XA log_and_order(), false otherwise. */
+  };
+
 #ifdef HAVE_PSI_INTERFACE
   /** The instrumentation key to use for @ LOCK_index. */
   PSI_mutex_key m_key_LOCK_index;
@@ -325,6 +401,12 @@
     In 5.0 it's 0 for relay logs too!
   */
   bool no_auto_events;
+  /* Queue of transactions queued up to participate in group commit. */
+  group_commit_entry *group_commit_queue;
+  /* Total number of committed transactions. */
+  ulonglong num_commits;
+  /* Number of group commits done. */
+  ulonglong num_group_commits;
 
   /* pointer to the sync period variable, for binlog this will be
      sync_binlog_period, for relay log this will be
@@ -346,6 +428,11 @@
   */
   int new_file_without_locking();
   int new_file_impl(bool need_lock);
+  int write_transaction(group_commit_entry *entry);
+  bool write_transaction_to_binlog_events(group_commit_entry *entry);
+  void trx_group_commit_leader(group_commit_entry *leader);
+  void mark_xid_done();
+  void mark_xids_active(uint xid_count);
 
 public:
   MYSQL_LOG::generate_name;
@@ -387,7 +474,8 @@
 
   int open(const char *opt_name);
   void close();
-  int log_xid(THD *thd, my_xid xid);
+  int log_and_order(THD *thd, my_xid xid, bool all,
+                    bool need_commit_ordered);
   int unlog(ulong cookie, my_xid xid);
   int recover(IO_CACHE *log, Format_description_log_event *fdle);
 #if !defined(MYSQL_CLIENT)
@@ -434,11 +522,11 @@
   int new_file();
 
   bool write(Log_event* event_info); // binary log write
-  bool write(THD *thd, IO_CACHE *cache, Log_event *commit_event, bool incident);
+  bool write_transaction_to_binlog(THD *thd, binlog_cache_data *cache_data,
+                                   Log_event *end_ev, bool all);
   bool write_incident(THD *thd, bool lock);
 
-  int  write_cache(THD *thd, IO_CACHE *cache,
-                   bool lock_log, bool flush_and_sync);
+  int  write_cache(THD *thd, IO_CACHE *cache);
   void set_write_error(THD *thd, bool is_transactional);
   bool check_write_error(THD *thd);
 
@@ -507,6 +595,7 @@
   inline void unlock_index() { mysql_mutex_unlock(&LOCK_index);}
   inline IO_CACHE *get_index_file() { return &index_file;}
   inline uint32 get_open_count() { return open_count; }
+  void set_status_variables();
 };
 
 class Log_event_handler
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -1490,6 +1490,7 @@
   ha_end();
   if (tc_log)
     tc_log->close();
+  TC_destroy();
   delegates_destroy();
   xid_cache_free();
   table_def_free();
@@ -4061,6 +4062,8 @@
   query_response_time_init();
 #endif // HAVE_RESPONSE_TIME_DISTRIBUTION
   /* We have to initialize the storage engines before CSV logging */
+  TC_init();
+
   init_global_table_stats();
   init_global_index_stats();
 
@@ -8004,6 +8007,7 @@
   key_LOCK_error_messages, key_LOG_INFO_lock, key_LOCK_thread_count,
   key_PARTITION_LOCK_auto_inc;
 PSI_mutex_key key_RELAYLOG_LOCK_index;
+PSI_mutex_key key_LOCK_wakeup_ready, key_LOCK_group_commit_queue, key_LOCK_commit_ordered;
 
 static PSI_mutex_info all_server_mutexes[]=
 {
@@ -8024,6 +8028,7 @@
   { &key_delayed_insert_mutex, "Delayed_insert::mutex", 0},
   { &key_hash_filo_lock, "hash_filo::lock", 0},
   { &key_LOCK_active_mi, "LOCK_active_mi", PSI_FLAG_GLOBAL},
+  { &key_LOCK_commit_ordered, "LOCK_commit_ordered", PSI_FLAG_GLOBAL},
   { &key_LOCK_connection_count, "LOCK_connection_count", PSI_FLAG_GLOBAL},
   { &key_LOCK_crypt, "LOCK_crypt", PSI_FLAG_GLOBAL},
   { &key_LOCK_delayed_create, "LOCK_delayed_create", PSI_FLAG_GLOBAL},
@@ -8039,6 +8044,7 @@
     "LOCK_global_index_stats", PSI_FLAG_GLOBAL},
   { &key_LOCK_gdl, "LOCK_gdl", PSI_FLAG_GLOBAL},
   { &key_LOCK_global_system_variables, "LOCK_global_system_variables", PSI_FLAG_GLOBAL},
+  { &key_LOCK_group_commit_queue, "LOCK_group_commit_queue", PSI_FLAG_GLOBAL},
   { &key_LOCK_manager, "LOCK_manager", PSI_FLAG_GLOBAL},
   { &key_LOCK_prepared_stmt_count, "LOCK_prepared_stmt_count", PSI_FLAG_GLOBAL},
   { &key_LOCK_rpl_status, "LOCK_rpl_status", PSI_FLAG_GLOBAL},
@@ -8050,6 +8056,7 @@
   { &key_LOCK_temporary_tables, "THD::LOCK_temporary_tables", 0},
   { &key_LOCK_user_conn, "LOCK_user_conn", PSI_FLAG_GLOBAL},
   { &key_LOCK_uuid_generator, "LOCK_uuid_generator", PSI_FLAG_GLOBAL},
+  { &key_LOCK_wakeup_ready, "THD::LOCK_wakeup_ready", 0},
   { &key_LOG_LOCK_log, "LOG::LOCK_log", 0},
   { &key_master_info_data_lock, "Master_info::data_lock", 0},
   { &key_master_info_run_lock, "Master_info::run_lock", 0},
@@ -8097,6 +8104,7 @@
   key_TABLE_SHARE_cond, key_user_level_lock_cond,
   key_COND_thread_count, key_COND_thread_cache, key_COND_flush_thread_cache;
 PSI_cond_key key_RELAYLOG_update_cond;
+PSI_cond_key key_COND_wakeup_ready, key_COND_queue_busy;
 
 static PSI_cond_info all_server_conds[]=
 {
@@ -8113,8 +8121,10 @@
   { &key_RELAYLOG_update_cond, "MYSQL_RELAY_LOG::update_cond", 0},
   { &key_COND_cache_status_changed, "Query_cache::COND_cache_status_changed", 0},
   { &key_COND_manager, "COND_manager", PSI_FLAG_GLOBAL},
+  { &key_COND_queue_busy, "COND_queue_busy", PSI_FLAG_GLOBAL},
   { &key_COND_rpl_status, "COND_rpl_status", PSI_FLAG_GLOBAL},
   { &key_COND_server_started, "COND_server_started", PSI_FLAG_GLOBAL},
+  { &key_COND_wakeup_ready, "THD::COND_wakeup_ready", 0},
   { &key_delayed_insert_cond, "Delayed_insert::cond", 0},
   { &key_delayed_insert_cond_client, "Delayed_insert::cond_client", 0},
   { &key_item_func_sleep_cond, "Item_func_sleep::cond", 0},
--- a/sql/mysqld.h
+++ b/sql/mysqld.h
@@ -273,6 +273,7 @@
   key_structure_guard_mutex, key_TABLE_SHARE_LOCK_ha_data,
   key_LOCK_error_messages, key_LOCK_thread_count, key_PARTITION_LOCK_auto_inc;
 extern PSI_mutex_key key_RELAYLOG_LOCK_index;
+extern PSI_mutex_key key_LOCK_wakeup_ready, key_LOCK_group_commit_queue, key_LOCK_commit_ordered;
 
 extern PSI_rwlock_key key_rwlock_LOCK_grant, key_rwlock_LOCK_logger,
   key_rwlock_LOCK_sys_init_connect, key_rwlock_LOCK_sys_init_slave,
@@ -293,6 +294,7 @@
   key_TABLE_SHARE_cond, key_user_level_lock_cond,
   key_COND_thread_count, key_COND_thread_cache, key_COND_flush_thread_cache;
 extern PSI_cond_key key_RELAYLOG_update_cond;
+extern PSI_cond_key key_COND_wakeup_ready, key_COND_queue_busy;
 
 extern PSI_thread_key key_thread_bootstrap, key_thread_delayed_insert,
   key_thread_handle_manager, key_thread_kill_server, key_thread_main,
--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -912,6 +912,8 @@
   mysql_mutex_init(key_LOCK_thd_data, &LOCK_thd_data, MY_MUTEX_INIT_FAST);
   mysql_mutex_init(key_LOCK_temporary_tables, &LOCK_temporary_tables,
                    MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_LOCK_wakeup_ready, &LOCK_wakeup_ready, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_COND_wakeup_ready, &COND_wakeup_ready, NULL);
 
   /* Variables with default values */
   proc_info="login";
@@ -1516,6 +1518,8 @@
   my_free(db);
   db= NULL;
   free_root(&transaction.mem_root,MYF(0));
+  mysql_cond_destroy(&COND_wakeup_ready);
+  mysql_mutex_destroy(&LOCK_wakeup_ready);
   mysql_mutex_destroy(&LOCK_thd_data);
   mysql_mutex_destroy(&LOCK_temporary_tables);
 #ifndef DBUG_OFF
@@ -5199,6 +5203,24 @@
   DBUG_RETURN(0);
 }
 
+void
+THD::wait_for_wakeup_ready()
+{
+  mysql_mutex_lock(&LOCK_wakeup_ready);
+  while (!wakeup_ready)
+    mysql_cond_wait(&COND_wakeup_ready, &LOCK_wakeup_ready);
+  mysql_mutex_unlock(&LOCK_wakeup_ready);
+}
+
+void
+THD::signal_wakeup_ready()
+{
+  mysql_mutex_lock(&LOCK_wakeup_ready);
+  wakeup_ready= true;
+  mysql_mutex_unlock(&LOCK_wakeup_ready);
+  mysql_cond_signal(&COND_wakeup_ready);
+}
+
 bool Discrete_intervals_list::append(ulonglong start, ulonglong val,
                                  ulonglong incr)
 {
--- a/sql/sql_class.h
+++ b/sql/sql_class.h
@@ -3017,6 +3017,14 @@
   LEX_STRING get_invoker_user() { return invoker_user; }
   LEX_STRING get_invoker_host() { return invoker_host; }
   bool has_invoker() { return invoker_user.length > 0; }
+  void clear_wakeup_ready() { wakeup_ready= false; }
+  /*
+    Sleep waiting for others to wake us up with signal_wakeup_ready().
+    Must call clear_wakeup_ready() before waiting.
+  */
+  void wait_for_wakeup_ready();
+  /* Wake this thread up from wait_for_wakeup_ready(). */
+  void signal_wakeup_ready();
 private:
 
   /** The current internal error handler for this thread, or NULL. */
@@ -3059,6 +3067,16 @@
    */
   LEX_STRING invoker_user;
   LEX_STRING invoker_host;
+  /*
+    Flag, mutex and condition for a thread to wait for a signal from another
+    thread.
+
+    Currently used to wait for group commit to complete, can also be used for
+    other purposes.
+  */
+  bool wakeup_ready;
+  mysql_mutex_t LOCK_wakeup_ready;
+  mysql_cond_t COND_wakeup_ready;
 };
 
 /* Returns string as 'IP' for the client-side of the connection represented by
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -889,6 +889,10 @@
   DBUG_ENTER("dispatch_command");
   DBUG_PRINT("info",("packet: '%*.s'; command: %d", packet_length, packet, command));
 
+  DBUG_EXECUTE_IF("crash_dispatch_command_before",
+                  { DBUG_PRINT("crash_dispatch_command_before", ("now"));
+                    DBUG_ABORT(); });
+
 #if defined(ENABLED_PROFILING)
   thd->profiling.start_new_query();
 #endif
--- a/mysql-test/suite/perfschema/r/dml_setup_instruments.result
+++ b/mysql-test/suite/perfschema/r/dml_setup_instruments.result
@@ -11,9 +11,9 @@
 wait/synch/mutex/sql/HA_DATA_PARTITION::LOCK_auto_inc	YES	YES
 wait/synch/mutex/sql/LOCK_active_mi	YES	YES
 wait/synch/mutex/sql/LOCK_audit_mask	YES	YES
+wait/synch/mutex/sql/LOCK_commit_ordered	YES	YES
 wait/synch/mutex/sql/LOCK_connection_count	YES	YES
 wait/synch/mutex/sql/LOCK_crypt	YES	YES
-wait/synch/mutex/sql/LOCK_delayed_create	YES	YES
 select * from performance_schema.setup_instruments
 where name like 'Wait/Synch/Rwlock/sql/%'
   and name not in ('wait/synch/rwlock/sql/CRYPTO_dynlock_value::lock')
@@ -38,6 +38,7 @@
 NAME	ENABLED	TIMED
 wait/synch/cond/sql/COND_flush_thread_cache	YES	YES
 wait/synch/cond/sql/COND_manager	YES	YES
+wait/synch/cond/sql/COND_queue_busy	YES	YES
 wait/synch/cond/sql/COND_queue_state	YES	YES
 wait/synch/cond/sql/COND_rpl_status	YES	YES
 wait/synch/cond/sql/COND_server_started	YES	YES
@@ -45,7 +46,6 @@
 wait/synch/cond/sql/COND_thread_count	YES	YES
 wait/synch/cond/sql/Delayed_insert::cond	YES	YES
 wait/synch/cond/sql/Delayed_insert::cond_client	YES	YES
-wait/synch/cond/sql/Event_scheduler::COND_state	YES	YES
 select * from performance_schema.setup_instruments
 where name='Wait';
 select * from performance_schema.setup_instruments
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -375,6 +375,9 @@
 static INNOBASE_SHARE *get_share(const char *table_name);
 static void free_share(INNOBASE_SHARE *share);
 static int innobase_close_connection(handlerton *hton, THD* thd);
+#ifdef EXTENDED_FOR_COMMIT_ORDERED
+static void innobase_commit_ordered(handlerton *hton, THD* thd, bool all);
+#endif
 static int innobase_commit(handlerton *hton, THD* thd, bool all);
 static int innobase_rollback(handlerton *hton, THD* thd, bool all);
 static int innobase_rollback_to_savepoint(handlerton *hton, THD* thd,
@@ -1699,7 +1702,10 @@
 	trx_t*	trx)	/*!< in/out: InnoDB transaction handle */
 {
 	DBUG_ENTER("innobase_trx_init");
+#ifndef EXTENDED_FOR_COMMIT_ORDERED
+	/* used by innobase_commit_ordered */
 	DBUG_ASSERT(EQ_CURRENT_THD(thd));
+#endif
 	DBUG_ASSERT(thd == trx->mysql_thd);
 
 	trx->check_foreigns = !thd_test_options(
@@ -1760,7 +1766,10 @@
 {
 	trx_t*&	trx = thd_to_trx(thd);
 
+#ifndef EXTENDED_FOR_COMMIT_ORDERED
+	/* used by innobase_commit_ordered */
 	ut_ad(EQ_CURRENT_THD(thd));
+#endif
 
 	if (trx == NULL) {
 		trx = innobase_trx_allocate(thd);
@@ -1846,6 +1855,7 @@
 {
 	trx->is_registered = 0;
 	trx->owns_prepare_mutex = 0;
+	trx->called_commit_ordered = 0;
 }
 
 /*********************************************************************//**
@@ -1861,6 +1871,29 @@
 }
 
 /*********************************************************************//**
+*/
+static inline
+void
+trx_called_commit_ordered_set(
+/*==========================*/
+	trx_t*	trx)
+{
+	ut_a(trx_is_registered_for_2pc(trx));
+	trx->called_commit_ordered = 1;
+}
+
+/*********************************************************************//**
+*/
+static inline
+bool
+trx_called_commit_ordered(
+/*======================*/
+	const trx_t*	trx)
+{
+	return(trx->called_commit_ordered == 1);
+}
+
+/*********************************************************************//**
 Check if transaction is started.
 @reutrn true if transaction is in state started */
 static
@@ -2435,6 +2468,9 @@
         innobase_hton->savepoint_set=innobase_savepoint;
         innobase_hton->savepoint_rollback=innobase_rollback_to_savepoint;
         innobase_hton->savepoint_release=innobase_release_savepoint;
+#ifdef EXTENDED_FOR_COMMIT_ORDERED
+	innobase_hton->commit_ordered=innobase_commit_ordered;
+#endif
         innobase_hton->commit=innobase_commit;
         innobase_hton->rollback=innobase_rollback;
         innobase_hton->prepare=innobase_xa_prepare;
@@ -3187,6 +3223,126 @@
 	DBUG_RETURN(0);
 }
 
+#ifdef EXTENDED_FOR_COMMIT_ORDERED
+/* MEMO:
+  InnoDB is coded with intention that always trx is accessed by the owner thd.
+  (not protected by any mutex/lock)
+  So, the caller of innobase_commit_ordered() should be conscious of
+  cache coherency between multi CPU about the trx, if called from another thd.
+
+  MariaDB's first implementation about it seems the cherency is protected by
+  the pthread_mutex LOCK_wakeup_ready. So, no problem for now.
+
+  But we should be aware the importance of the coherency.
+ */
+/*****************************************************************//**
+low function function innobase_commit_ordered().*/
+static
+void
+innobase_commit_ordered_low(
+/*========================*/
+	trx_t*	trx, 	/*!< in: Innodb transaction */
+	THD*	thd)	/*!< in: MySQL thread handle */
+{
+	ulonglong tmp_pos;
+	DBUG_ENTER("innobase_commit_ordered");
+
+	/* This part was from innobase_commit() */
+
+	/* We need current binlog position for ibbackup to work.
+	Note, the position is current because commit_ordered is guaranteed
+	to be called in same sequenece as writing to binlog. */
+retry:
+	if (innobase_commit_concurrency > 0) {
+		mysql_mutex_lock(&commit_cond_m);
+		commit_threads++;
+
+		if (commit_threads > innobase_commit_concurrency) {
+			commit_threads--;
+			mysql_cond_wait(&commit_cond,
+					  &commit_cond_m);
+			mysql_mutex_unlock(&commit_cond_m);
+			goto retry;
+		}
+		else {
+			mysql_mutex_unlock(&commit_cond_m);
+		}
+	}
+
+	mysql_bin_log_commit_pos(thd, &tmp_pos, &(trx->mysql_log_file_name));
+	trx->mysql_log_offset = (ib_int64_t) tmp_pos;
+
+	/* Don't do write + flush right now. For group commit
+	   to work we want to do the flush in the innobase_commit()
+	   method, which runs without holding any locks. */
+	trx->flush_log_later = TRUE;
+	innobase_commit_low(trx);
+	trx->flush_log_later = FALSE;
+
+	if (innobase_commit_concurrency > 0) {
+		mysql_mutex_lock(&commit_cond_m);
+		commit_threads--;
+		mysql_cond_signal(&commit_cond);
+		mysql_mutex_unlock(&commit_cond_m);
+	}
+
+	DBUG_VOID_RETURN;
+}
+
+/*****************************************************************//**
+Perform the first, fast part of InnoDB commit.
+
+Doing it in this call ensures that we get the same commit order here
+as in binlog and any other participating transactional storage engines.
+
+Note that we want to do as little as really needed here, as we run
+under a global mutex. The expensive fsync() is done later, in
+innobase_commit(), without a lock so group commit can take place.
+
+Note also that this method can be called from a different thread than
+the one handling the rest of the transaction. */
+static
+void
+innobase_commit_ordered(
+/*====================*/
+	handlerton *hton, /*!< in: Innodb handlerton */
+	THD*	thd,	/*!< in: MySQL thread handle of the user for whom
+			the transaction should be committed */
+	bool	all)	/*!< in:	TRUE - commit transaction
+				FALSE - the current SQL statement ended */
+{
+	trx_t*		trx;
+	DBUG_ENTER("innobase_commit_ordered");
+	DBUG_ASSERT(hton == innodb_hton_ptr);
+
+	trx = check_trx_exists(thd);
+
+	/* Since we will reserve the kernel mutex, we have to release
+	the search system latch first to obey the latching order. */
+
+	if (trx->has_search_latch) {
+		trx_search_latch_release_if_reserved(trx);
+	}
+
+	if (!trx_is_registered_for_2pc(trx) && trx_is_started(trx)) {
+		/* We cannot throw error here; instead we will catch this error
+		again in innobase_commit() and report it from there. */
+		DBUG_VOID_RETURN;
+	}
+
+	/* commit_ordered is only called when committing the whole transaction
+	(or an SQL statement when autocommit is on). */
+	DBUG_ASSERT(all ||
+		(!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)));
+
+	innobase_commit_ordered_low(trx, thd);
+
+	trx_called_commit_ordered_set(trx);
+
+	DBUG_VOID_RETURN;
+}
+#endif /* EXTENDED_FOR_COMMIT_ORDERED */
+
 /*****************************************************************//**
 Commits a transaction in an InnoDB database or marks an SQL statement
 ended.
@@ -3238,6 +3394,16 @@
 		/* We were instructed to commit the whole transaction, or
 		this is an SQL statement end and autocommit is on */
 
+#ifdef EXTENDED_FOR_COMMIT_ORDERED
+		ut_ad(!trx_has_prepare_commit_mutex(trx));
+
+		/* Run the fast part of commit if we did not already. */
+		if (!trx_called_commit_ordered(trx)) {
+			innobase_commit_ordered_low(trx, thd);
+		}
+#else
+		ut_ad(!trx_called_commit_ordered(trx));
+
 		/* We need current binlog position for ibbackup to work.
 		Note, the position is current because of
 		prepare_commit_mutex */
@@ -3292,6 +3458,7 @@
   
 			mysql_mutex_unlock(&prepare_commit_mutex);
   		}
+#endif /* EXTENDED_FOR_COMMIT_ORDERED */
   
 		trx_deregister_from_2pc(trx);
 
@@ -10973,6 +11140,7 @@
 
 	srv_active_wake_master_thread();
 
+#ifndef EXTENDED_FOR_COMMIT_ORDERED
 	if (thd_sql_command(thd) != SQLCOM_XA_PREPARE
 	    && (all
 		|| !thd_test_options(
@@ -10999,6 +11167,7 @@
 		mysql_mutex_lock(&prepare_commit_mutex);
 		trx_owns_prepare_commit_mutex_set(trx);
 	}
+#endif /* ifndef EXTENDED_FOR_COMMIT_ORDERED */
 
 	return(error);
 }
--- a/storage/innobase/handler/ha_innodb.h
+++ b/storage/innobase/handler/ha_innodb.h
@@ -240,6 +240,12 @@
 struct charset_info_st *thd_charset(MYSQL_THD thd);
 LEX_STRING *thd_query_string(MYSQL_THD thd);
 
+#ifdef EXTENDED_FOR_COMMIT_ORDERED
+/** Get the file name and position of the MySQL binlog corresponding to the
+ * current commit.
+ */
+void mysql_bin_log_commit_pos(THD *thd, ulonglong *out_pos, const char **out_file);
+#else
 /** Get the file name of the MySQL binlog.
  * @return the name of the binlog file
  */
@@ -249,6 +255,7 @@
  * @return byte offset from the beginning of the binlog
  */
 ulonglong mysql_bin_log_file_pos(void);
+#endif
 
 /**
   Check if a user thread is a replication slave thread
--- a/storage/innobase/include/trx0trx.h
+++ b/storage/innobase/include/trx0trx.h
@@ -494,6 +494,7 @@
 					this is set to 1 then registered should
 					also be set to 1. This is used in the
 					XA code */
+	unsigned	called_commit_ordered:1;/* 1 if innobase_commit_ordered has run. */
 	/*------------------------------*/
 	ulint		isolation_level;/* TRX_ISO_REPEATABLE_READ, ... */
 	ulint		check_foreigns;	/* normally TRUE, but if the user
--- a/storage/innobase/trx/trx0trx.c
+++ b/storage/innobase/trx/trx0trx.c
@@ -111,6 +111,7 @@
 
 	trx->is_registered = 0;
 	trx->owns_prepare_mutex = 0;
+	trx->called_commit_ordered = 0;
 
 	trx->start_time = ut_time();
 
--- /dev/null
+++ b/mysql-test/r/group_commit.result
@@ -0,0 +1,63 @@
+CREATE TABLE t1 (a VARCHAR(10) PRIMARY KEY) ENGINE=innodb;
+SELECT variable_value INTO @commits FROM information_schema.global_status
+WHERE variable_name = 'binlog_commits';
+SELECT variable_value INTO @group_commits FROM information_schema.global_status
+WHERE variable_name = 'binlog_group_commits';
+SET DEBUG_SYNC= "commit_before_get_LOCK_commit_ordered SIGNAL group1_running WAIT_FOR group2_queued";
+INSERT INTO t1 VALUES ("con1");
+set DEBUG_SYNC= "now WAIT_FOR group1_running";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL group2_con2";
+SET DEBUG_SYNC= "commit_after_release_LOCK_log WAIT_FOR group3_committed";
+SET DEBUG_SYNC= "commit_after_group_run_commit_ordered SIGNAL group2_visible WAIT_FOR group2_checked";
+INSERT INTO t1 VALUES ("con2");
+SET DEBUG_SYNC= "now WAIT_FOR group2_con2";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL group2_con3";
+INSERT INTO t1 VALUES ("con3");
+SET DEBUG_SYNC= "now WAIT_FOR group2_con3";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL group2_con4";
+INSERT INTO t1 VALUES ("con4");
+SET DEBUG_SYNC= "now WAIT_FOR group2_con4";
+SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
+SELECT * FROM t1 ORDER BY a;
+a
+SET DEBUG_SYNC= "now SIGNAL group2_queued";
+SELECT * FROM t1 ORDER BY a;
+a
+con1
+SET DEBUG_SYNC= "commit_before_get_LOCK_commit_ordered SIGNAL group3_con5";
+SET DEBUG_SYNC= "commit_after_get_LOCK_log SIGNAL con5_leader WAIT_FOR con6_queued";
+INSERT INTO t1 VALUES ("con5");
+SET DEBUG_SYNC= "now WAIT_FOR con5_leader";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL con6_queued";
+INSERT INTO t1 VALUES ("con6");
+SET DEBUG_SYNC= "now WAIT_FOR group3_con5";
+SELECT * FROM t1 ORDER BY a;
+a
+con1
+SET DEBUG_SYNC= "now SIGNAL group3_committed";
+SET DEBUG_SYNC= "now WAIT_FOR group2_visible";
+SELECT * FROM t1 ORDER BY a;
+a
+con1
+con2
+con3
+con4
+SET DEBUG_SYNC= "now SIGNAL group2_checked";
+SELECT * FROM t1 ORDER BY a;
+a
+con1
+con2
+con3
+con4
+con5
+con6
+SELECT variable_value - @commits FROM information_schema.global_status
+WHERE variable_name = 'binlog_commits';
+variable_value - @commits
+6
+SELECT variable_value - @group_commits FROM information_schema.global_status
+WHERE variable_name = 'binlog_group_commits';
+variable_value - @group_commits
+3
+SET DEBUG_SYNC= 'RESET';
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/r/group_commit_binlog_pos.result
@@ -0,0 +1,35 @@
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb;
+INSERT INTO t1 VALUES (0);
+SET DEBUG_SYNC= "commit_after_get_LOCK_log SIGNAL con1_waiting WAIT_FOR con3_queued";
+SET DEBUG_SYNC= "commit_loop_entry_commit_ordered SIGNAL con1_loop WAIT_FOR con1_loop_cont EXECUTE 3";
+INSERT INTO t1 VALUES (1);
+SET DEBUG_SYNC= "now WAIT_FOR con1_waiting";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL con2_queued";
+INSERT INTO t1 VALUES (2);
+SET DEBUG_SYNC= "now WAIT_FOR con2_queued";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL con3_queued";
+INSERT INTO t1 VALUES (3);
+SET DEBUG_SYNC= "now WAIT_FOR con1_loop";
+SET DEBUG_SYNC= "now SIGNAL con1_loop_cont";
+SET DEBUG_SYNC= "now WAIT_FOR con1_loop";
+SET DEBUG_SYNC= "now SIGNAL con1_loop_cont";
+SET DEBUG_SYNC= "now WAIT_FOR con1_loop";
+SELECT * FROM t1 ORDER BY a;
+a
+0
+1
+2
+SET SESSION debug="+d,crash_dispatch_command_before";
+SELECT 1;
+Got one of the listed errors
+Got one of the listed errors
+Got one of the listed errors
+SELECT * FROM t1 ORDER BY a;
+a
+0
+1
+2
+3
+InnoDB: Last MySQL binlog file position 0 768, file name ./master-bin.000001
+SET DEBUG_SYNC= 'RESET';
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/r/group_commit_crash.result
@@ -0,0 +1,120 @@
+CREATE TABLE t1(a CHAR(255),
+b CHAR(255),
+c CHAR(255),
+d CHAR(255),
+id INT AUTO_INCREMENT,
+PRIMARY KEY(id)) ENGINE=InnoDB;
+create table t2 like t1;
+create procedure setcrash(IN i INT)
+begin
+CASE i
+WHEN 1 THEN SET SESSION debug="d,crash_commit_after_prepare";
+WHEN 2 THEN SET SESSION debug="d,crash_commit_after_log";
+WHEN 3 THEN SET SESSION debug="d,crash_commit_before_unlog";
+WHEN 4 THEN SET SESSION debug="d,crash_commit_after";
+WHEN 5 THEN SET SESSION debug="d,crash_commit_before";
+ELSE BEGIN END;
+END CASE;
+end //
+FLUSH TABLES;
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+RESET MASTER;
+START TRANSACTION;
+insert into t1 select * from t2;
+call setcrash(5);
+COMMIT;
+Got one of the listed errors
+SELECT * FROM t1 ORDER BY id;
+a	b	c	d	id
+SHOW BINLOG EVENTS LIMIT 2,1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+delete from t1;
+RESET MASTER;
+START TRANSACTION;
+insert into t1 select * from t2;
+call setcrash(4);
+COMMIT;
+Got one of the listed errors
+SELECT * FROM t1 ORDER BY id;
+a	b	c	d	id
+a	b	c	d	1
+a	b	c	d	2
+a	b	c	d	3
+a	b	c	d	4
+a	b	c	d	5
+a	b	c	d	6
+a	b	c	d	7
+a	b	c	d	8
+a	b	c	d	9
+a	b	c	d	10
+SHOW BINLOG EVENTS LIMIT 2,1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	175	Query	1	269	use `test`; insert into t1 select * from t2
+delete from t1;
+RESET MASTER;
+START TRANSACTION;
+insert into t1 select * from t2;
+call setcrash(3);
+COMMIT;
+Got one of the listed errors
+SELECT * FROM t1 ORDER BY id;
+a	b	c	d	id
+a	b	c	d	1
+a	b	c	d	2
+a	b	c	d	3
+a	b	c	d	4
+a	b	c	d	5
+a	b	c	d	6
+a	b	c	d	7
+a	b	c	d	8
+a	b	c	d	9
+a	b	c	d	10
+SHOW BINLOG EVENTS LIMIT 2,1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	175	Query	1	269	use `test`; insert into t1 select * from t2
+delete from t1;
+RESET MASTER;
+START TRANSACTION;
+insert into t1 select * from t2;
+call setcrash(2);
+COMMIT;
+Got one of the listed errors
+SELECT * FROM t1 ORDER BY id;
+a	b	c	d	id
+a	b	c	d	1
+a	b	c	d	2
+a	b	c	d	3
+a	b	c	d	4
+a	b	c	d	5
+a	b	c	d	6
+a	b	c	d	7
+a	b	c	d	8
+a	b	c	d	9
+a	b	c	d	10
+SHOW BINLOG EVENTS LIMIT 2,1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	175	Query	1	269	use `test`; insert into t1 select * from t2
+delete from t1;
+RESET MASTER;
+START TRANSACTION;
+insert into t1 select * from t2;
+call setcrash(1);
+COMMIT;
+Got one of the listed errors
+SELECT * FROM t1 ORDER BY id;
+a	b	c	d	id
+SHOW BINLOG EVENTS LIMIT 2,1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+delete from t1;
+DROP TABLE t1;
+DROP TABLE t2;
+DROP PROCEDURE setcrash;
--- /dev/null
+++ b/mysql-test/r/xa_binlog.result
@@ -0,0 +1,32 @@
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+SET binlog_format= mixed;
+RESET MASTER;
+XA START 'xatest';
+INSERT INTO t1 VALUES (1);
+XA END 'xatest';
+XA PREPARE 'xatest';
+XA COMMIT 'xatest';
+XA START 'xatest';
+INSERT INTO t1 VALUES (2);
+XA END 'xatest';
+XA COMMIT 'xatest' ONE PHASE;
+BEGIN;
+INSERT INTO t1 VALUES (3);
+COMMIT;
+SELECT * FROM t1 ORDER BY a;
+a
+1
+2
+3
+SHOW BINLOG EVENTS LIMIT 1,9;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	1	#	BEGIN
+master-bin.000001	#	Query	1	#	use `test`; INSERT INTO t1 VALUES (1)
+master-bin.000001	#	Query	1	#	COMMIT
+master-bin.000001	#	Query	1	#	BEGIN
+master-bin.000001	#	Query	1	#	use `test`; INSERT INTO t1 VALUES (2)
+master-bin.000001	#	Xid	1	#	COMMIT /* xid=XX */
+master-bin.000001	#	Query	1	#	BEGIN
+master-bin.000001	#	Query	1	#	use `test`; INSERT INTO t1 VALUES (3)
+master-bin.000001	#	Xid	1	#	COMMIT /* xid=XX */
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/suite/binlog/r/binlog_ioerr.result
@@ -0,0 +1,28 @@
+CALL mtr.add_suppression("Error writing file 'master-bin'");
+RESET MASTER;
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb;
+INSERT INTO t1 VALUES(0);
+SET SESSION debug='+d,fail_binlog_write_1';
+INSERT INTO t1 VALUES(1);
+ERROR HY000: Error writing file 'master-bin' (errno: 28)
+INSERT INTO t1 VALUES(2);
+ERROR HY000: Error writing file 'master-bin' (errno: 28)
+SET SESSION debug='';
+INSERT INTO t1 VALUES(3);
+SELECT * FROM t1;
+a
+0
+3
+SHOW BINLOG EVENTS;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+BINLOG	POS	Format_desc	1	ENDPOS	Server ver: #, Binlog ver: #
+BINLOG	POS	Query	1	ENDPOS	use `test`; CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb
+BINLOG	POS	Query	1	ENDPOS	BEGIN
+BINLOG	POS	Query	1	ENDPOS	use `test`; INSERT INTO t1 VALUES(0)
+BINLOG	POS	Xid	1	ENDPOS	COMMIT /* XID */
+BINLOG	POS	Query	1	ENDPOS	BEGIN
+BINLOG	POS	Query	1	ENDPOS	BEGIN
+BINLOG	POS	Query	1	ENDPOS	BEGIN
+BINLOG	POS	Query	1	ENDPOS	use `test`; INSERT INTO t1 VALUES(3)
+BINLOG	POS	Xid	1	ENDPOS	COMMIT /* XID */
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/suite/binlog/t/binlog_ioerr.test
@@ -0,0 +1,30 @@
+source include/have_debug.inc;
+source include/have_innodb.inc;
+source include/have_log_bin.inc;
+source include/have_binlog_format_mixed_or_statement.inc;
+
+CALL mtr.add_suppression("Error writing file 'master-bin'");
+
+RESET MASTER;
+
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb;
+INSERT INTO t1 VALUES(0);
+SET SESSION debug='+d,fail_binlog_write_1';
+--error ER_ERROR_ON_WRITE
+INSERT INTO t1 VALUES(1);
+--error ER_ERROR_ON_WRITE
+INSERT INTO t1 VALUES(2);
+SET SESSION debug='';
+INSERT INTO t1 VALUES(3);
+SELECT * FROM t1;
+
+# Actually the output from this currently shows a bug.
+# The injected IO error leaves partially written transactions in the binlog in
+# the form of stray "BEGIN" events.
+# These should disappear from the output if binlog error handling is improved
+# (see MySQL Bug#37148 and WL#1790).
+--replace_regex /\/\* xid=.* \*\//\/* XID *\// /Server ver: .*, Binlog ver: .*/Server ver: #, Binlog ver: #/ /table_id: [0-9]+/table_id: #/
+--replace_column 1 BINLOG 2 POS 5 ENDPOS
+SHOW BINLOG EVENTS;
+
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/t/group_commit.test
@@ -0,0 +1,115 @@
+--source include/have_debug_sync.inc
+--source include/have_innodb.inc
+--source include/have_log_bin.inc
+
+# Test some group commit code paths by using debug_sync to do controlled
+# commits of 6 transactions: first 1 alone, then 3 as a group, then 2 as a
+# group.
+#
+# Group 3 is allowed to race as far as possible ahead before group 2 finishes
+# to check some edge case for concurrency control.
+
+CREATE TABLE t1 (a VARCHAR(10) PRIMARY KEY) ENGINE=innodb;
+
+SELECT variable_value INTO @commits FROM information_schema.global_status
+ WHERE variable_name = 'binlog_commits';
+SELECT variable_value INTO @group_commits FROM information_schema.global_status
+ WHERE variable_name = 'binlog_group_commits';
+
+connect(con1,localhost,root,,);
+connect(con2,localhost,root,,);
+connect(con3,localhost,root,,);
+connect(con4,localhost,root,,);
+connect(con5,localhost,root,,);
+connect(con6,localhost,root,,);
+
+# Start group1 (with one thread) doing commit, waiting for
+# group2 to queue up before finishing.
+
+connection con1;
+SET DEBUG_SYNC= "commit_before_get_LOCK_commit_ordered SIGNAL group1_running WAIT_FOR group2_queued";
+send INSERT INTO t1 VALUES ("con1");
+
+# Make group2 (with three threads) queue up.
+# Make sure con2 is the group commit leader for group2.
+# Make group2 wait with running commit_ordered() until group3 has committed.
+
+connection con2;
+set DEBUG_SYNC= "now WAIT_FOR group1_running";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL group2_con2";
+SET DEBUG_SYNC= "commit_after_release_LOCK_log WAIT_FOR group3_committed";
+SET DEBUG_SYNC= "commit_after_group_run_commit_ordered SIGNAL group2_visible WAIT_FOR group2_checked";
+send INSERT INTO t1 VALUES ("con2");
+connection con3;
+SET DEBUG_SYNC= "now WAIT_FOR group2_con2";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL group2_con3";
+send INSERT INTO t1 VALUES ("con3");
+connection con4;
+SET DEBUG_SYNC= "now WAIT_FOR group2_con3";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL group2_con4";
+send INSERT INTO t1 VALUES ("con4");
+
+# When group2 is queued, let group1 continue and queue group3.
+
+connection default;
+SET DEBUG_SYNC= "now WAIT_FOR group2_con4";
+
+# At this point, trasaction 1 is still not visible as commit_ordered() has not
+# been called yet.
+SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
+SELECT * FROM t1 ORDER BY a;
+
+SET DEBUG_SYNC= "now SIGNAL group2_queued";
+connection con1;
+reap;
+
+# Now transaction 1 is visible.
+connection default;
+SELECT * FROM t1 ORDER BY a;
+
+connection con5;
+SET DEBUG_SYNC= "commit_before_get_LOCK_commit_ordered SIGNAL group3_con5";
+SET DEBUG_SYNC= "commit_after_get_LOCK_log SIGNAL con5_leader WAIT_FOR con6_queued";
+send INSERT INTO t1 VALUES ("con5");
+
+connection con6;
+SET DEBUG_SYNC= "now WAIT_FOR con5_leader";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL con6_queued";
+send INSERT INTO t1 VALUES ("con6");
+
+connection default;
+SET DEBUG_SYNC= "now WAIT_FOR group3_con5";
+# Still only transaction 1 visible, as group2 have not yet run commit_ordered().
+SELECT * FROM t1 ORDER BY a;
+SET DEBUG_SYNC= "now SIGNAL group3_committed";
+SET DEBUG_SYNC= "now WAIT_FOR group2_visible";
+# Now transactions 1-4 visible.
+SELECT * FROM t1 ORDER BY a;
+SET DEBUG_SYNC= "now SIGNAL group2_checked";
+
+connection con2;
+reap;
+
+connection con3;
+reap;
+
+connection con4;
+reap;
+
+connection con5;
+reap;
+
+connection con6;
+reap;
+
+connection default;
+# Check all transactions finally visible.
+SELECT * FROM t1 ORDER BY a;
+
+SELECT variable_value - @commits FROM information_schema.global_status
+ WHERE variable_name = 'binlog_commits';
+SELECT variable_value - @group_commits FROM information_schema.global_status
+ WHERE variable_name = 'binlog_group_commits';
+
+SET DEBUG_SYNC= 'RESET';
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/t/group_commit_binlog_pos-master.opt
@@ -0,0 +1 @@
+--skip-stack-trace --skip-core-file
--- /dev/null
+++ b/mysql-test/t/group_commit_binlog_pos.test
@@ -0,0 +1,89 @@
+--source include/have_debug_sync.inc
+--source include/have_innodb.inc
+--source include/have_log_bin.inc
+--source include/have_binlog_format_mixed_or_statement.inc
+
+# Need DBUG to crash the server intentionally
+--source include/have_debug.inc
+# Don't test this under valgrind, memory leaks will occur as we crash
+--source include/not_valgrind.inc
+
+# The test case currently uses grep and tail, which may be unavailable on
+# some windows systems. But see MWL#191 for how to remove the need for grep.
+--source include/not_windows.inc
+
+# XtraDB stores the binlog position corresponding to the last commit, and
+# prints it during crash recovery.
+# Test that we get the correct position when we group commit several
+# transactions together.
+
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb;
+INSERT INTO t1 VALUES (0);
+
+connect(con1,localhost,root,,);
+connect(con2,localhost,root,,);
+connect(con3,localhost,root,,);
+
+# Queue up three commits for group commit.
+
+connection con1;
+SET DEBUG_SYNC= "commit_after_get_LOCK_log SIGNAL con1_waiting WAIT_FOR con3_queued";
+SET DEBUG_SYNC= "commit_loop_entry_commit_ordered SIGNAL con1_loop WAIT_FOR con1_loop_cont EXECUTE 3";
+send INSERT INTO t1 VALUES (1);
+
+connection con2;
+SET DEBUG_SYNC= "now WAIT_FOR con1_waiting";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL con2_queued";
+send INSERT INTO t1 VALUES (2);
+
+connection con3;
+SET DEBUG_SYNC= "now WAIT_FOR con2_queued";
+SET DEBUG_SYNC= "commit_group_commit_queue SIGNAL con3_queued";
+send INSERT INTO t1 VALUES (3);
+
+connection default;
+SET DEBUG_SYNC= "now WAIT_FOR con1_loop";
+# At this point, no transactions are committed.
+SET DEBUG_SYNC= "now SIGNAL con1_loop_cont";
+SET DEBUG_SYNC= "now WAIT_FOR con1_loop";
+# At this point, 1 transaction is committed.
+SET DEBUG_SYNC= "now SIGNAL con1_loop_cont";
+SET DEBUG_SYNC= "now WAIT_FOR con1_loop";
+
+# At this point, 2 transactions are committed.
+SELECT * FROM t1 ORDER BY a;
+
+connection con2;
+reap;
+
+# Now crash the server with 1+2 in-memory committed, 3 only prepared.
+connection default;
+system echo wait-group_commit_binlog_pos.test >> $MYSQLTEST_VARDIR/tmp/mysqld.1.expect;
+SET SESSION debug="+d,crash_dispatch_command_before";
+--error 2006,2013
+SELECT 1;
+
+connection con1;
+--error 2006,2013
+reap;
+connection con3;
+--error 2006,2013
+reap;
+
+system echo restart-group_commit_binlog_pos.test >> $MYSQLTEST_VARDIR/tmp/mysqld.1.expect;
+
+connection default;
+--enable_reconnect
+--source include/wait_until_connected_again.inc
+
+# Crash recovery should recover all three transactions.
+SELECT * FROM t1 ORDER BY a;
+
+# Check that the binlog position reported by InnoDB is the correct one
+# for the end of the second transaction (as can be checked with
+# mysqlbinlog).
+let $MYSQLD_DATADIR= `SELECT @@datadir`;
+--exec grep 'InnoDB: Last MySQL binlog file position' $MYSQLD_DATADIR/../../log/mysqld.1.err | tail -1
+
+SET DEBUG_SYNC= 'RESET';
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/t/group_commit_crash-master.opt
@@ -0,0 +1 @@
+--skip-stack-trace --skip-core-file
--- /dev/null
+++ b/mysql-test/t/group_commit_crash.test
@@ -0,0 +1,80 @@
+# Testing group commit by crashing a few times.
+# Test adapted from the Facebook patch: lp:mysqlatfacebook
+--source include/not_embedded.inc
+# Don't test this under valgrind, memory leaks will occur
+--source include/not_valgrind.inc
+
+# Binary must be compiled with debug for crash to occur
+--source include/have_debug.inc
+--source include/have_innodb.inc
+--source include/have_log_bin.inc
+
+let $innodb_file_format_max_orig=`select @@innodb_file_format_max`;
+CREATE TABLE t1(a CHAR(255),
+                b CHAR(255),
+                c CHAR(255),
+                d CHAR(255),
+                id INT AUTO_INCREMENT,
+                PRIMARY KEY(id)) ENGINE=InnoDB;
+create table t2 like t1;
+delimiter //;
+create procedure setcrash(IN i INT)
+begin
+  CASE i
+    WHEN 1 THEN SET SESSION debug="d,crash_commit_after_prepare";
+    WHEN 2 THEN SET SESSION debug="d,crash_commit_after_log";
+    WHEN 3 THEN SET SESSION debug="d,crash_commit_before_unlog";
+    WHEN 4 THEN SET SESSION debug="d,crash_commit_after";
+    WHEN 5 THEN SET SESSION debug="d,crash_commit_before";
+    ELSE BEGIN END;
+  END CASE;
+end //
+delimiter ;//
+# Avoid getting a crashed mysql.proc table.
+FLUSH TABLES;
+
+let $numtests = 5;
+
+let $numinserts = 10;
+while ($numinserts)
+{
+  dec $numinserts;
+  INSERT INTO t2(a, b, c, d) VALUES ('a', 'b', 'c', 'd');
+}
+
+--enable_reconnect
+
+while ($numtests)
+{
+  RESET MASTER;
+
+  START TRANSACTION;
+  insert into t1 select * from t2;
+  # Write file to make mysql-test-run.pl expect crash
+  --exec echo "restart" > $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+
+  eval call setcrash($numtests);
+
+  # Run the crashing query
+  --error 2006,2013
+  COMMIT;
+
+  # Poll the server waiting for it to be back online again.
+  --source include/wait_until_connected_again.inc
+
+  # table and binlog should be in sync.
+  SELECT * FROM t1 ORDER BY id;
+  SHOW BINLOG EVENTS LIMIT 2,1;
+
+  delete from t1;
+
+  dec $numtests;
+}
+
+# final cleanup
+DROP TABLE t1;
+DROP TABLE t2;
+DROP PROCEDURE setcrash;
+--disable_query_log
+eval SET GLOBAL innodb_file_format_max=$innodb_file_format_max_orig;
+--enable_query_log
--- /dev/null
+++ b/mysql-test/t/xa_binlog.test
@@ -0,0 +1,32 @@
+--source include/have_innodb.inc
+--source include/have_log_bin.inc
+
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+
+# Fix binlog format (otherwise SHOW BINLOG EVENTS will fluctuate).
+SET binlog_format= mixed;
+
+RESET MASTER;
+
+XA START 'xatest';
+INSERT INTO t1 VALUES (1);
+XA END 'xatest';
+XA PREPARE 'xatest';
+XA COMMIT 'xatest';
+
+XA START 'xatest';
+INSERT INTO t1 VALUES (2);
+XA END 'xatest';
+XA COMMIT 'xatest' ONE PHASE;
+
+BEGIN;
+INSERT INTO t1 VALUES (3);
+COMMIT;
+
+SELECT * FROM t1 ORDER BY a;
+
+--replace_column 2 # 5 #
+--replace_regex /xid=[0-9]+/xid=XX/
+SHOW BINLOG EVENTS LIMIT 1,9;
+
+DROP TABLE t1;