[jira] Commented: (JCR-929) Under Heavy load in a Cluster HTTP Threads Block and stall requests

["Ian Boston (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JCR-929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496808 ] 

Ian Boston commented on JCR-929:
--------------------------------

Restarting the cluster node with the problem appears to clear the problem with no bad effects to the JCR,

There are no deadlocks reported on any threads on the locked nodes and other https requests that do not use the JCR are operating correctly. 

Connecting a Profiler like JProfiler to the JVM on startup indicates that there are no blocked threads, and no deadlocks are detected.

Adding a mbean monitor thread to analyse the threads within the JVM indicates that there are no blocked threads when the node stops responding.

It does not look like this is a deadlock condition.

> Under Heavy load in a Cluster HTTP Threads Block and stall requests
> -------------------------------------------------------------------
>
>                 Key: JCR-929
>                 URL: https://issues.apache.org/jira/browse/JCR-929
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.3
>         Environment: 2 Node Cluster, OSX, JDK 1.5 with DatabaseJournal, DatabasePersistanceManager, all content in DB, using WebDAV to load
>            Reporter: Ian Boston
>
> Under Heavy load created by mounting both nodes in the cluster in OSX Finder and then uploading large numebers of files to each node at the same time ( a few 1000), eventually one of the nodes stops responding and the Finder mount timesout and disconnects.
> Once that happens that node becomes unusable.
> More mount attempts will prompt for a password indicating HTTP is still running, but will timeout once the connection is authenticated.
> Access by the Web Browser will prompt for a password, conenct and provide a once only listing of any collection in the workspace. If you try to refresh that collection, the HTTP request hangs forever.

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