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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (AMQ-6590) KahaDB index loses track of free pages on unclean shutdown
Date Thu, 02 Feb 2017 12:10:51 GMT


ASF subversion and git services commented on AMQ-6590:

Commit 83511c96e5cf91f348a81ecc3c4439aa345548dd in activemq's branch refs/heads/master from
[;h=83511c9 ]

Removing un-needed imports

> KahaDB index loses track of free pages on unclean shutdown
> ----------------------------------------------------------
>                 Key: AMQ-6590
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.14.3
>            Reporter: Christopher L. Shannon
>            Assignee: Christopher L. Shannon
>             Fix For: 5.15.0, 5.14.4
> I have discovered an issue with the KahaDB index recovery after an unclean shutdown (OOM
error, kill -9, etc) that leads to excessive disk space usage. 
> Normally on clean shutdown the index stores the known set of free pages to and
reads that in on start up to know which pages can be re-used.  On an unclean shutdown this
is not written to disk so on start up the index is supposed to scan the page file to figure
out all of the free pages.
> Unfortunately it turns out that this scan of the page file is being done before the total
page count value has been set so when the iterator is created it always thinks there are 0
pages to scan.
> The end result is that every time an unclean shutdown occurs all known free pages are
lost and no longer tracked.  This of course means new free pages have to be allocated and
all of the existing space is now lost which will lead to excessive index file growth over

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