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From "Alan Conway (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-3603) New approach to HA
Date Wed, 09 Nov 2011 20:45:51 GMT
New approach to HA
------------------

                 Key: QPID-3603
                 URL: https://issues.apache.org/jira/browse/QPID-3603
             Project: Qpid
          Issue Type: Improvement
    Affects Versions: 0.14
            Reporter: Alan Conway
            Assignee: Alan Conway


The existing cluster code suffers from some maintainability and performance problems. This
is a proposal to write a new HA solution based on the "replicating subscription" that will
replace the current cluster. This is a competing proposal to QPID-2920. 

Summary: a "replicating subscription" is a special queue browser that can see acquired and
un-acquired messages and also receives dequeue events to replicate remote queue contents.
The new HA solution will create & manage these subscriptions in order to maintain a back-up
of a primary broker on one or more back-up brokers. This is an active-passive hot-standby
configuration, where exactly one broker is primary and the others are secondary. Initially
plan is to use Cluster Suite's rgmanager to enforce the roles and manage fail-over, but we
could support other cluster resource managers (e.g. PaceMaker) in the future.

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