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https://issues.apache.org/jira/browse/JCR-3027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13069421#comment-13069421
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angela commented on JCR-3027:
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hi chad
thanks a lot for the patches. i will take a look and apply them as soon as
possible.
> JCR Server has concurrency issues on JcrWebdavServer.SessionCache internal
> HashMap caches
> -----------------------------------------------------------------------------------------
>
> Key: JCR-3027
> URL: https://issues.apache.org/jira/browse/JCR-3027
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: jackrabbit-jcr-server, jackrabbit-webapp
> Affects Versions: 2.2.5
> Reporter: chad davis
> Assignee: angela
> Labels: dav, davex, performance, remote
> Fix For: 2.3.0
>
> Attachments: JCR-3027_JCRWebdavServer.java.patch,
> JCR-3027_JCRWebdavServerServlet.java.patch, JCR-3027_web.xml.patch
>
>
> After doing the davex remoting performance work outlined in JCR-3026, the
> increased concurrency on my jcr server exposed a lot of errors related to
> getting and putting from the JcrWebdavServer.SessionCache's internal
> HashMap's. This problem with HashMap's is a well known concurrency error and
> was easily fixed by upgrading these maps to ConcurrentHashMaps. Performance
> seems dramatically better.
> The fix includes exposure of a tuning parameter that allows the user to set
> the expected concurrency level. This is the number of concurrent requests
> you expect the server to be handling. In the typical davex remoting
> scenario, this means you should tune this server side value to match the
> total max connections of all clients pointed at the server. See JCR-3026.
> USAGE: Set the 'concurrency-level' init param for the JcrRemotingServlet,
> via the web.xml of the jackabbit-webapp component. Default value is 50. Or
> you can intervene in a lower level api if appropriate.
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