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Date: Mon, 27 Feb 2012 06:42:48 +0000 (UTC)
From: "Christian Stocker (Commented) (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
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Subject: [jira] [Commented] (JCR-3244) CPU Load issue with 2.3.6 and 2.4.0
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    [ https://issues.apache.org/jira/browse/JCR-3244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217069#comment-13217069 ] 

Christian Stocker commented on JCR-3244:
----------------------------------------

And here's the dump by Lukas:
http://pastie.org/private/jyorgp7qyhchckiyfzja
                
> CPU Load issue with 2.3.6 and 2.4.0
> -----------------------------------
>
>                 Key: JCR-3244
>                 URL: https://issues.apache.org/jira/browse/JCR-3244
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-jcr-server
>            Reporter: Christian Stocker
>
> We discovered an issue with adding and removing references to a Weak Reference Multi-Value property
> within the same session, which leads to running 100% CPU .
> In PHPCR/Jackalope, I do the following:
> ***
> // remove the weakreference property if one was there
> $m->setProperty("refs",null);
> $session->save();
> //add some references
> $m->setProperty("refs",$refs,10);
> $session->save();
> //remove one and set the others again
> array_pop($refs);
> $m->setProperty("refs",$refs,10);
> $session->save();
> ***
> If I do the last setProperty() with a new session, then it works.
> On the HTTP level it looks like this:
> https://gist.github.com/1869626
> The last REPORT (where we try to resolve the UUID to a path), it hangs.
> According to Jukka, the problem is the following:
> ***
> Yep. From the thread dump posted by Lukas it looks like the culprit
> here is the appliesToResource() lock computation done by the
> TxLockManagerImpl class in jackrabbit-webdav. The method makes a wrong
> assumption about the return value of the Text.getRelativeParent()
> utility method, and ends up in an infinite loop. 
> ***

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