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From "Alex Karasulu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DIRSERVER-1019) Using same thread pool for I/O processing and request handling causes clients to hang and MINA thread pool depletion
Date Thu, 16 Aug 2007 06:37:30 GMT

     [ https://issues.apache.org/jira/browse/DIRSERVER-1019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Karasulu updated DIRSERVER-1019:
-------------------------------------

    Summary: Using same thread pool for I/O processing and request handling causes clients
to hang and MINA thread pool depletion  (was: Using same thread pool for I/O processing as
request handling )

Improving title for clarity

> Using same thread pool for I/O processing and request handling causes clients to hang
and MINA thread pool depletion
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: DIRSERVER-1019
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1019
>             Project: Directory ApacheDS
>          Issue Type: Bug
>    Affects Versions: 1.0.2, 1.0.1, 1.5.0, 1.0, 1.0-RC4, 1.0-RC3, 1.0-RC2, 1.0-RC1, pre-1.0
>            Reporter: Alex Karasulu
>            Assignee: Alex Karasulu
>            Priority: Blocker
>             Fix For: 1.5.1, 1.0.3
>
>
> In the ServerContext factory the same thread pool is being used to process I/O 
> and request handling.  This is depleting the thread pool rapidly causing the 
> server to hang under certain conditions.  I caught this bug on a x86_64 machine 
> with multiple cores when the ReferralITest test was hanging.  The right number
> of connections and requests being processed could have caused this issue to
> arrise.  Regardless thankfully the issue appeared and Trustin found the cause 
> for it.
> Trustin tracked the bug down to the way we misconfigured MINA's thread pools.
> He is currently fixing the problem in trunk and I suspect the same issue exists 
> within the 1.0 branch.
> I suspect this could have caused serious issues in performance if not causing
> several load test clients to hang while others had requests processed.  I 
> recommend reassessing performance metrics once again after this fix.  There
> should be a considerable boost.  I think our impression that MINA was a 
> bottleneck may have been attributed to this misconfiguration issue.
> Anyways once Trustin has the fix in trunk I will apply it to the 1.0 branch and 
> make sure all tests pass successfully.  I am assigning this issue to myself
> even though T is providing the fix so I can manage the application on the
> 1.0 branch and document the results.

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