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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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6
mysql-test/suite/binlog_encryption/rpl_semi_sync.result
View File

@ -4,6 +4,7 @@ connection master;
call mtr.add_suppression("Timeout waiting for reply of binlog");
call mtr.add_suppression("Read semi-sync reply");
call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT.");
call mtr.add_suppression("mysqld: Got an error reading communication packets");
connection slave;
call mtr.add_suppression("Master server does not support semi-sync");
call mtr.add_suppression("Semi-sync slave .* reply");
@ -176,7 +177,7 @@ Variable_name Value
Rpl_semi_sync_master_yes_tx 14
show status like 'Rpl_semi_sync_master_clients';
Variable_name Value
Rpl_semi_sync_master_clients 1
Rpl_semi_sync_master_clients 0
[ semi-sync replication of these transactions will fail ]
insert into t1 values (500);
[ master status should be OFF ]
@ -321,7 +322,6 @@ connection slave;
include/stop_slave.inc
reset slave;
connection master;
kill query _tid;
connection slave;
include/start_slave.inc
connection master;
@ -353,7 +353,6 @@ include/stop_slave.inc
reset slave;
connection master;
reset master;
kill query _tid;
set sql_log_bin=0;
grant replication slave on *.* to rpl@127.0.0.1 identified by 'rpl_password';
flush privileges;
@ -404,7 +403,6 @@ SHOW STATUS LIKE 'Rpl_semi_sync_slave_status';
Variable_name Value
Rpl_semi_sync_slave_status OFF
connection master;
kill query _tid;
[ Semi-sync status on master should be ON ]
show status like 'Rpl_semi_sync_master_clients';
Variable_name Value