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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-5578) preallocate journal files
Date Mon, 20 Apr 2015 15:20:00 GMT

    [ https://issues.apache.org/jira/browse/AMQ-5578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14503014#comment-14503014
] 

Gary Tully commented on AMQ-5578:
---------------------------------

resolved an additional problem  - preallocation was doing overwrite of existing data!
http://git-wip-us.apache.org/repos/asf/activemq/commit/4a821186

> preallocate journal files
> -------------------------
>
>                 Key: AMQ-5578
>                 URL: https://issues.apache.org/jira/browse/AMQ-5578
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Message Store
>    Affects Versions: 5.11.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>              Labels: journal, kahaDB, perfomance
>             Fix For: 5.12.0
>
>
> Our journals are append only, however we use the size to track journal rollover on recovery
and replay. We can improve performance if we never update the size on disk and preallocate
on creation.
> Rework journal logic to ensure size is never updated. This will allow the configuration
option from https://issues.apache.org/jira/browse/AMQ-4947 to be the default.



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