diff options
Diffstat (limited to 'sql/sql_repl.cc')
| -rw-r--r-- | sql/sql_repl.cc | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sql/sql_repl.cc b/sql/sql_repl.cc index bf4b1eb0c70..8fb82798a45 100644 --- a/sql/sql_repl.cc +++ b/sql/sql_repl.cc @@ -796,6 +796,25 @@ err: DBUG_RETURN(error); } +/* + + Kill all Binlog_dump threads which previously talked to the same slave + ("same" means with the same server id). Indeed, if the slave stops, if the + Binlog_dump thread is waiting (pthread_cond_wait) for binlog update, then it + will keep existing until a query is written to the binlog. If the master is + idle, then this could last long, and if the slave reconnects, we could have 2 + Binlog_dump threads in SHOW PROCESSLIST, until a query is written to the + binlog. To avoid this, when the slave reconnects and sends COM_BINLOG_DUMP, + the master kills any existing thread with the slave's server id (if this id is + not zero; it will be true for real slaves, but false for mysqlbinlog when it + sends COM_BINLOG_DUMP to get a remote binlog dump). + + SYNOPSIS + kill_zombie_dump_threads() + slave_server_id the slave's server id + +*/ + void kill_zombie_dump_threads(uint32 slave_server_id) { |