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Posted to issues@activemq.apache.org by "Timothy Bish (JIRA)" <ji...@apache.org> on 2016/03/09 16:02:40 UTC

[jira] [Created] (AMQ-6203) KahaDB: Allow rewrite of message acks in older logs which prevent cleanup

Timothy Bish created AMQ-6203:
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             Summary: KahaDB: Allow rewrite of message acks in older logs which prevent cleanup
                 Key: AMQ-6203
                 URL: https://issues.apache.org/jira/browse/AMQ-6203
             Project: ActiveMQ
          Issue Type: Improvement
          Components: KahaDB
    Affects Versions: 5.13.2, 5.12.3, 5.13.1, 5.13.0
            Reporter: Timothy Bish
            Assignee: Timothy Bish
             Fix For: 5.14.0


There are cases where a chain of journal logs can grow due to acks for messages in older logs needing to be kept so that on recovery proper state can be restored and older messages not be resurrected.  

In many cases just moving the acks from one log forward to a new log can free an entire chain during subsequent GC cycles.  The 'compacted' ack log can be written during the time between GC cycles without the index lock being held meaning normal broker operations can continue.  



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