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Backport BUG#47298 Semisync: always wait until timeout if no semi-sync slave available

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Add an option to control whether the master should keep waiting
until timeout when it detected that there is no semi-sync slave
available.

The bool option 'rpl_semi_sync_master_wait_no_slave' is 1 by
defalt, and will keep waiting until timeout. When set to 0, the
master will switch to asynchronous replication immediately when
no semi-sync slave is available.
This commit is contained in:
He Zhenxing
2009-10-12 21:15:32 +08:00
parent 26b47d9347
commit 1a7c7a4066
6 changed files with 49 additions and 20 deletions
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7
plugin/semisync/semisync_slave_plugin.cc
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@ -56,10 +56,11 @@ int repl_semi_slave_request_dump(Binlog_relay_IO_param *param,
}
row= mysql_fetch_row(res);
if (!row || strcmp(row[1], "ON"))
if (!row)
{
/* Master does not support or not configured semi-sync */
sql_print_warning("Master server does not support or not configured semi-sync replication, fallback to asynchronous");
/* Master does not support semi-sync */
sql_print_warning("Master server does not support semi-sync, "
"fallback to asynchronous replication");
rpl_semi_sync_slave_status= 0;
return 0;
}