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Posted to dev@jackrabbit.apache.org by "Thomas Mueller (JIRA)" <ji...@apache.org> on 2010/09/21 15:35:35 UTC
[jira] Resolved: (JCR-2746) Sleep in possibly endless loop in
ObservationDispatcher
[ https://issues.apache.org/jira/browse/JCR-2746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Mueller resolved JCR-2746.
---------------------------------
Resolution: Fixed
> Sleep in possibly endless loop in ObservationDispatcher
> -------------------------------------------------------
>
> Key: JCR-2746
> URL: https://issues.apache.org/jira/browse/JCR-2746
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core, observation
> Affects Versions: 2.0.0, 2.1.0, 2.1.1
> Reporter: Jukka Zitting
> Assignee: Thomas Mueller
> Fix For: 2.2.0
>
> Attachments: TestObservationEndlessLoop.java
>
>
> The rate-limitation code we added in JCR-2402 to prevent the observation queue from growing too large was a good idea, but the current implementation is a bit troublesome since it blocks the thread while it still holds the journal lock, the SISM reader lock, and the SessionState lock. This can cause a deadlock under heavy workloads if any of the observation listeners attempts to reuse the session (not recommended/supported, but can still happen) or write to the repository (quite likely).
> To solve this problem we should move the rate-limiter code to outside the scope of any internal locks.
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