Slave I/O thread won't attempt to automatically reconnect to the master / error-code 1593

Bug #1268735 reported by Agustín G on 2014-01-13
This bug affects 2 people
Affects Status Importance Assigned to Milestone
MySQL Server
Percona Server moved to
Vlad Lesin
Won't Fix
Vlad Lesin
Fix Released
Vlad Lesin
Vlad Lesin

Bug Description

140111 17:02:01 [ERROR] Slave I/O: The slave I/O thread stops because SET @master_heartbeat_period on master failed. Error: , Error_code: 1593
140111 17:02:01 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.015318', position 887067847

The error in question is:

$ perror 1593
MySQL error code 1593 (ER_SLAVE_FATAL_ERROR): Fatal error: %s

Percona Server 5.5.29-29.4 is running on the affected slave. Looking at the source code for that release, the problematic code path appears to be:

1536 if (mysql_real_query(mysql, query, strlen(query))
1537 && !check_io_slave_killed(mi->io_thd, mi, NULL))
1538 {
1539 errmsg= "The slave I/O thread stops because SET @master_heartbeat_period "
1540 "on master failed.";
1541 err_code= ER_SLAVE_FATAL_ERROR;
1542 sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
1543 mysql_free_result(mysql_store_result(mysql));
1544 goto err;
1545 }
1546 mysql_free_result(mysql_store_result(mysql));

I believe this exhibits a bug. Instead of just assuming the error is fatal, it should do "is_network_error(mysql_errno(mysql))" and determine whether the slave thread should be restarted (this is done in Percona Server 5.6.13, for instance).

Additionally, since there is already an error code from mysql_real_query, should it be later overwritten with ER_SLAVE_FATAL_ERROR?

Related branches

tags: added: upstream

Upstream 5.6 fixed by

5.6$ bzr log -r 2661.723.1
revno: 2661.723.1
committer: Andrei Elkin <email address hidden>
branch nick: rep2-wl2540-checksum
timestamp: Fri 2010-05-28 12:47:19 +0300
  wl#2540 replication checksum

  intermediate changeset implements the task w/o relying on FD (to be refined by the following patch) as well as with per-event (A) (should be removed from all but FD). The 3rd todo will be correct affected tests because of FD is going to be extended by (A) size of 1 bytte. Finally, merging with fixes for bug#49741 shall complete the show

Percona now uses JIRA for bug reports so this bug report is migrated to:

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