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From nonspecialist <nab...@clabber.com>
Subject Pure master slave recovery questions
Date Tue, 20 Dec 2011 03:57:42 GMT
If I have a pure master-slave configuration and the master fails, the
recovery is to:

- shut down the master (if it's not already dead)
- shut down the slave
- copy "the contents of the data directory" from the slave to the master
- start up the master

Question 1:

In the data directory, there are 2 main subdirectories (along with the log
files, which wouldn't get copied): the kahadb subdirectory, and a
subdirectory named for the broker itself (in my case, mq01.a, or mq02.a for
the slave)

Does the broker-named directory need to be copied too? If so, should it be
renamed to the same as the master, so that the master will pick it up?

Question 2:

After starting the master, should I clean out the slave directory?
Reconnecting the slave after the master has been active for a bit gives me
errors in the master log file about stale subscriptions when the slave
connects; but cleaning out the slave data dir would mean that any persistent
messages saved there from before the master crashed would now only exist on
the master, because they won't get synced across when the slave connects;
only new messages get persisted.


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