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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2832) Possible replay of old messages post index recovery from journal - data files containing acks reclaimed/cleaned up in error
Date Mon, 19 Jul 2010 09:19:52 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-2832.
-----------------------------

    Resolution: Fixed

resolved in  r964804 KahaDB store and  r964866 AMQ store

Data files containing only acks for messages in referenced data files are now excluded from
cleanup till the dependent message file is eligible for cleanup.

> Possible replay of old messages post index recovery from journal - data files containing
acks reclaimed/cleaned up in error
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2832
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2832
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.3.2
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.4.0
>
>
> With long lived messages and outstanding acks, ack distribution can be sparse across
data files. If a data file is in use (still has unreferenced messages, the data files containing
acks for all those messages also need to be maintained to ensure a replay of the journal replays
the corresponding acks. Currently it is possible that data files with no unreferenced messages
but with acks pertinent to an in use data file can get deleted. The result is duplicate or
relay of old messages after journal recovery (following a crash/restart)

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