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https://issues.apache.org/jira/browse/AMQ-6590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16653831#comment-16653831
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Jeff Genender commented on AMQ-6590:
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[~cshannon], I think the criticality of this is restart on a failed broker. It
could cause slowness in failover that delays startup of the broker. In a clean
shut down, yes the delay moved to the back, but its a known delay when you are
shutting it down in a clean fashion. Thus you can plan it. This makes sense
as during a failover, you likely need availability immediately since that
generally is not planned.
> KahaDB index loses track of free pages on unclean shutdown
> ----------------------------------------------------------
>
> Key: AMQ-6590
> URL: https://issues.apache.org/jira/browse/AMQ-6590
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.14.3
> Reporter: Christopher L. Shannon
> Assignee: Christopher L. Shannon
> Priority: Major
> Fix For: 5.15.0, 5.14.4, 5.16.0, 5.15.7
>
>
> 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
> db.free 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 time.
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