MySQL-5.5.35 merge

1 files changed, 13 insertions, 15 deletions

diff --git a/plugin/semisync/semisync_master.cc b/plugin/semisync/semisync_master.cc
index 23e35c59281..625f7448945 100644
--- a/plugin/semisync/semisync_master.cc
+++ b/plugin/semisync/semisync_master.cc
@@ -478,13 +478,17 @@ void ReplSemiSyncMaster::remove_slave()
   lock();
   rpl_semi_sync_master_clients--;
 
-  /* If user has chosen not to wait if no semi-sync slave available
-     and the last semi-sync slave exits, turn off semi-sync on master
-     immediately.
-   */
-  if (!rpl_semi_sync_master_wait_no_slave &&
-      rpl_semi_sync_master_clients == 0)
-    switch_off();
+  /* Only switch off if semi-sync is enabled and is on */
+  if (getMasterEnabled() && is_on())
+  {
+    /* If user has chosen not to wait if no semi-sync slave available
+       and the last semi-sync slave exits, turn off semi-sync on master
+       immediately.
+     */
+    if (!rpl_semi_sync_master_wait_no_slave &&
+        rpl_semi_sync_master_clients == 0)
+      switch_off();
+  }
   unlock();
 }
 
@@ -883,10 +887,7 @@ int ReplSemiSyncMaster::updateSyncHeader(unsigned char *packet,
    * target, do not request replies from the slave.
    */
   if (!getMasterEnabled() || !is_semi_sync_slave())
-  {
-    sync = false;
     return 0;
-  }
 
   function_enter(kWho);
 
@@ -894,15 +895,12 @@ int ReplSemiSyncMaster::updateSyncHeader(unsigned char *packet,
 
   /* This is the real check inside the mutex. */
   if (!getMasterEnabled())
-  {
-    sync = false;
-    goto l_end;
-  }
+    goto l_end; // sync= false at this point in time
 
   if (is_on())
   {
     /* semi-sync is ON */
-    sync = false;     /* No sync unless a transaction is involved. */
+    /* sync= false; No sync unless a transaction is involved. */
 
     if (reply_file_name_inited_)
     {