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MDEV-13073 This part merges the Ali semisync related changes

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and specifically the ack receiving functionality.
Semisync is turned to be static instead of plugin so its functions
are invoked at the same points as RUN_HOOKS.
The RUN_HOOKS and the observer interface remain to be removed by later
patch.

Todo:
  React on killed status by repl_semisync_master.wait_after_sync(). Currently
  Repl_semi_sync_master::commit_trx does not check the killed status.

  There were few bugfixes found that are present in mysql and its unclear
  whether/how they are covered. Those include:

  Bug#15985893: GTID SKIPPED EVENTS ON MASTER CAUSE SEMI SYNC TIME-OUTS
  Bug#17932935 CALLING IS_SEMI_SYNC_SLAVE() IN EACH FUNCTION CALL
                 HAS BAD PERFORMANCE
  Bug#20574628: SEMI-SYNC REPLICATION PERFORMANCE DEGRADES WITH A HIGH NUMBER OF THREADS
This commit is contained in:
Andrei Elkin
2017-11-22 17:10:34 +02:00
committed by Monty
parent abceaa7542
commit e972125f11
32 changed files with 1197 additions and 695 deletions
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22
sql/sql_class.h
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@ -1569,7 +1569,8 @@ enum enum_thread_type
SYSTEM_THREAD_EVENT_WORKER= 16,
SYSTEM_THREAD_BINLOG_BACKGROUND= 32,
SYSTEM_THREAD_SLAVE_BACKGROUND= 64,
SYSTEM_THREAD_GENERIC= 128
SYSTEM_THREAD_GENERIC= 128,
SYSTEM_THREAD_SEMISYNC_MASTER_BACKGROUND= 256
};
inline char const *
@ -1585,6 +1586,7 @@ show_system_thread(enum_thread_type thread)
RETURN_NAME_AS_STRING(SYSTEM_THREAD_EVENT_SCHEDULER);
RETURN_NAME_AS_STRING(SYSTEM_THREAD_EVENT_WORKER);
RETURN_NAME_AS_STRING(SYSTEM_THREAD_SLAVE_BACKGROUND);
RETURN_NAME_AS_STRING(SYSTEM_THREAD_SEMISYNC_MASTER_BACKGROUND);
default:
sprintf(buf, "<UNKNOWN SYSTEM THREAD: %d>", thread);
return buf;
@ -2261,7 +2263,8 @@ public:
/* Needed by MariaDB semi sync replication */
Trans_binlog_info *semisync_info;
/* If this is a semisync slave connection. */
bool semi_sync_slave;
ulonglong client_capabilities; /* What the client supports */
ulong max_client_packet_length;
@ -3147,11 +3150,20 @@ public:
/* Debug Sync facility. See debug_sync.cc. */
struct st_debug_sync_control *debug_sync_control;
#endif /* defined(ENABLED_DEBUG_SYNC) */
THD(my_thread_id id, bool is_wsrep_applier= false);
/**
@param id thread identifier
@param is_wsrep_applier thread type
@param skip_lock instruct whether @c LOCK_global_system_variables
is already locked, to not acquire it then.
*/
THD(my_thread_id id, bool is_wsrep_applier= false, bool skip_lock= false);
~THD();
void init(void);
/**
@param skip_lock instruct whether @c LOCK_global_system_variables
is already locked, to not acquire it then.
*/
void init(bool skip_lock= false);
/*
Initialize memory roots necessary for query processing and (!)
pre-allocate memory for it. We can't do that in THD constructor because