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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-4094) offline durable subs with selectors can lead to page leaks in the index and bloat of db.data in kahadb
Date Fri, 05 Oct 2012 19:04:02 GMT

    [ https://issues.apache.org/jira/browse/AMQ-4094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470564#comment-13470564
] 

Gary Tully commented on AMQ-4094:
---------------------------------

a workaround is to avoid page overflow by configuring a large index page size for kahadb.
The size needs to be > any single stored value. In the case of offline durables with selectors
the sequence set of pending messages needs to fit in one page.
                
> offline durable subs with selectors can lead to page leaks in the index and bloat of
db.data in kahadb
> ------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-4094
>                 URL: https://issues.apache.org/jira/browse/AMQ-4094
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.6.0, 5.7.0
>            Reporter: Gary Tully
>              Labels: db.data, durable, kahadb, topic
>             Fix For: 5.8.0
>
>
> There is a page leak in the index, related to durable subs with selectors. producing
and consuming past variable limits demonstrate incremental growth in the db.data, the in-use
page count increases

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