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MDEV-24302: RESET MASTER hangs

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Starting with MariaDB 10.5, roughly after MDEV-23855 was fixed,
we are observing sporadic hangs during the execution of the
RESET MASTER statement. We are hoping to fix the hangs with these
changes, but due to the rather infrequent occurrence of the hangs
and our inability to reliably reproduce the hangs, we cannot be
sure of this.

What we do know is that innodb_force_recovery=2 (or a larger setting)
will prevent srv_master_callback (the former srv_master_thread) from
running. In that mode, periodic log flushes would never occur and
RESET MASTER could hang indefinitely. That is demonstrated by the new
test case that was developed by Andrei Elkin. We fix this case by
implementing a special case for it.

This also includes some code cleanup and renames of misleadingly
named code. The interface has nothing to do with log checkpoints in
the storage engine; it is only about requesting log writes to be
persistent.

handlerton::commit_checkpoint_request,
commit_checkpoint_notify_ha(): Remove the unused parameter hton.

log_requests.start: Replaces pending_checkpoint_list.
log_requests.end: Replaces pending_checkpoint_list_end.
log_requests.mutex: Replaces pending_checkpoint_mutex.

log_flush_notify_and_unlock(), log_flush_notify(): Replaces
innobase_mysql_log_notify().  The new implementation should be
functionally equivalent to the old one.

innodb_log_flush_request(): Replaces innobase_checkpoint_request().
Implement a fast path for common cases, and reduce the mutex hold time.
POSSIBLE FIX OF THE HANG: We will invoke commit_checkpoint_notify_ha()
for the current request if it is already satisfied, as well as invoke
log_flush_notify_and_unlock() for any satisfied requests.

log_write(): Invoke log_flush_notify() when the write is already durable.
This was missing WITH_PMEM when the log is in persistent memory.

Reviewed by: Vladislav Vaintroub
This commit is contained in:
Marko Mäkelä
2021-03-29 15:16:23 +03:00
parent 8e2d69f7b8
commit e8b7fceb82
9 changed files with 175 additions and 164 deletions
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7
sql/handler.cc
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@ -1,5 +1,5 @@
/* Copyright (c) 2000, 2016, Oracle and/or its affiliates.
Copyright (c) 2009, 2020, MariaDB Corporation.
Copyright (c) 2009, 2021, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -861,7 +861,7 @@ static my_bool commit_checkpoint_request_handlerton(THD *unused1, plugin_ref plu
void *cookie= st->cookie;
if (st->pre_hook)
(*st->pre_hook)(cookie);
(*hton->commit_checkpoint_request)(hton, cookie);
(*hton->commit_checkpoint_request)(cookie);
}
return FALSE;
}
@ -2437,8 +2437,7 @@ int ha_recover(HASH *commit_list)
Called by engine to notify TC that a new commit checkpoint has been reached.
See comments on handlerton method commit_checkpoint_request() for details.
*/
void
commit_checkpoint_notify_ha(handlerton *hton, void *cookie)
void commit_checkpoint_notify_ha(void *cookie)
{
tc_log->commit_checkpoint_notify(cookie);
}