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MDEV-34705: Binlog-in-engine: Implement refcounting outstanding OOB records

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Keep track of, for each binlog file, how many open transactions have
out-of-band data starting in that file. Then at the start of each new binlog
file, in the header page, record the file_no of the earliest file that this
file might contain commit records with references back to OOB records in
that earlier file.

Use this in PURGE BINARY LOGS, so that when a dump thread (slave connection)
is active in file number N, and that file (or a later one) may require
looking back in an earlier file number M for out-of-band records, purge will
stop already at file number M. This way, we avoid that purge accidentally
deletes some binlog file that a dump thread would later get an error on
because it needs to read out-of-band data.

This patch also includes placeholder data for a similar facility for XA
references. The actual implementation of support for XA is for later though.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2025-04-19 07:46:56 +02:00
parent d496e5278d
commit f0d4b63bac
14 changed files with 982 additions and 69 deletions
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24
sql/sql_repl.cc
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@@ -3391,6 +3391,30 @@ static int send_engine_events(binlog_send_info *info, LOG_INFO* linfo)
(Log_event_type)((uchar)(*packet)[LOG_EVENT_OFFSET+ev_offset]);
DBUG_ASSERT(event_type != START_ENCRYPTION_EVENT);
#ifdef ENABLED_DEBUG_SYNC
DBUG_EXECUTE_IF("dump_thread_wait_before_send_xid",
{
if (event_type == XID_EVENT)
{
net_flush(info->net);
const char act[]=
"now "
"wait_for signal.continue";
DBUG_ASSERT(debug_sync_service);
DBUG_ASSERT(!debug_sync_set_action(
info->thd,
STRING_WITH_LEN(act)));
const char act2[]=
"now "
"signal signal.continued";
DBUG_ASSERT(!debug_sync_set_action(
info->thd,
STRING_WITH_LEN(act2)));
}
});
#endif
if (((info->errmsg= send_event_to_slave(info, event_type, nullptr,
ev_offset, &info->error_gtid))))
return 1;