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The following test case shows the problem.
This issue is experienced in all atomic tests and fixing it will speed these up notable!
--source include/have_innodb.inc
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--source include/have_log_bin.inc
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# This test takes on a fast machine and ssd disks 20 seconds
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# 20 seconds with InnoDB and < 1 second with Aria
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# All time spent at RESET MASTER
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# It looks like there is a sleep() issue as 20 RESET MASTER takes ~20 seconds.
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let $engine="InnoDB";
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let $e= 0;
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while ($e < 20)
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{
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inc $e;
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--eval create table t1 (a int, b int, key(a)) engine=$engine
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insert into t1 values (1,1),(2,2);
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commit;
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flush tables;
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RESET MASTER;
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DROP TABLE t1;
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}
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The following patch for 10.6 fixes the slowdown (but has other problem). Thee patch is only for demonstrating where the problem is likely to be:
--- a/sql/log.cc
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+++ b/sql/log.cc
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@@ -4331,6 +4331,7 @@ bool MYSQL_BIN_LOG::reset_logs(THD *thd, bool create_new_log,
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mysql_mutex_unlock(&LOCK_after_binlog_sync);
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mysql_mutex_unlock(&LOCK_commit_ordered);
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+#ifdef 0
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mark_xids_active(current_binlog_id, 1);
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do_checkpoint_request(current_binlog_id);
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@@ -4352,6 +4353,7 @@ bool MYSQL_BIN_LOG::reset_logs(THD *thd, bool create_new_log,
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no new ones will be written. So we can proceed to delete the logs.
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*/
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mysql_mutex_unlock(&LOCK_xid_list);
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+#endif
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}
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It is probably the checkpoint request that is slow.
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