Author: David Beveridge
Revision Date: 2018-05-05 21:51:16 UTC

Release 2.2.2

Author: SeWoong Jeon
Revision Date: 2012-02-02 09:57:33 UTC

To make sure vip is assigned exactly,
mmm_control executes "vip ping test" and displays the result.
"Net::Ping" is required.

(Ex.) $ mmm_control show
  db01(192.168.56.10) master/ONLINE. Roles: writer(192.168.56.20)/Ping_OK
  db02(192.168.56.11) master/ONLINE. Roles: reader(192.168.56.21)/Ping_Error

Author: shawn
Revision Date: 2012-01-17 23:28:09 UTC

Made it so, when the agent is becoming the writer, we check to see if
the relay_log_pos is changing. If the relay_log_pos is changing that
means that you are still behind master, and it is not a good time to
move the IP addresses over.

This is used for busy mysql servers so that mysql can be a few seconds
behind master, but the relay log is up to the second. This makes it so
we wait up to 30 seconds for the relay log to stop moving before moving
the writer IP over.

Author: John Ferlito
Revision Date: 2011-09-07 05:02:31 UTC

Prevent socket leak in checkers

A particular race condition could occur on highly contended servers
which would lead to a socket leak which also manifested as a memory
leak. Once sockets leaked to the system limit connections to MySQL would
fail.

This would happen if the timeout from the ALARM signal handler happened
inside the DBI->connect call. DBI may already have created the socket
but because the signal was raised the socket is never cleaned up.

Author: Kenny Gryp
Revision Date: 2011-05-30 17:59:49 UTC

fixed error output

Author: Yves Trudeau
Revision Date: 2010-11-09 21:21:54 UTC

Set return value to 1 to avoid killing when passive or with network issue

Author: Yves Trudeau
Revision Date: 2010-09-28 19:32:44 UTC

adding the variable auto_start_slave to control the behavior of the slave restart on Replication_fail

Author: Yves Trudeau
Revision Date: 2010-09-28 18:56:39 UTC

tested version, behave as expected

Author: Devananda
Revision Date: 2010-09-22 18:39:19 UTC

fixes bug #645460 -- monitor in PASSIVE mode will call _kill_host unnecessarily

Author: BJ Dierkes
Revision Date: 2009-12-10 19:43:16 UTC

Changing pid_path to /var/run/mysql-mmm/mmm_{agent,mon}.pid

Author: Ecker Sany
Revision Date: 2009-11-17 18:16:59 UTC

Experimental version which doesn't starts a perl interpreter for each check
script.

The new behaviour can be switched by two new prameters in the files:

  lib/Agent/Helpers.pm
  lib/Agent/Helpers/Actions.pm

Switch both to 0 or both to 1.

Author: maciej.dobrzanski
Revision Date: 2009-05-27 21:42:23 UTC

Error checks on role change in agent

Author: Pascal Hofmann
Revision Date: 2009-05-27 23:59:35 UTC

mmm2:
-added "kill host"-functionality