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# include/wait_for_purge.inc
#
# SUMMARY
#
# Repeatedly attempt to purge binlogs up to a specific point, until
# SHOW BINARY LOGS shows it has succeeded.
# This can be useful to avoid races where slaves are stopped but the
# corresponding binlog dump thread on the master has not yet terminated.
# Async binlog checkpoints can also delay purge.
#
# Note that it may be necessary to inject at least one event in the binlog
# after stopping slaves, or master may not detect stop of slave for a long
# time (or forever), depending on details of test case, if replication
# heartbeat is enabled, etc.
#
# USAGE:
#
# --let $purge_binlogs_to=master-bin.000003
# --source include/wait_for_purge.inc
#
# SIDE EFFECTS:
#
# Disables --query_log and warnings while running, enables them afterwards.
--echo include/wait_for_purge.inc "$purge_binlogs_to"
let $_wait_count= 300;
let $_done= 0;
--disable_query_log
--disable_warnings
while ($_wait_count)
{
dec $_wait_count;
eval PURGE BINARY LOGS TO "$purge_binlogs_to";
let $_cur_binlog= query_get_value(SHOW BINARY LOGS, Log_name, 1);
if (`SELECT "$_cur_binlog" = "$purge_binlogs_to"`)
{
let $_done= 1;
let $_wait_count= 0;
}
if ($_wait_count)
{
real_sleep 0.1;
}
}
if (!$_done)
{
SHOW FULL PROCESSLIST;
eval SHOW BINARY LOGS;
--die ERROR: failed while waiting for binlog purge to $purge_binlogs_to
}
--enable_warnings
--enable_query_log
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