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From "Alex Karasulu (JIRA)" <>
Subject [jira] Created: (DIRSERVER-1019) Using same thread pool for I/O processing as request handling
Date Thu, 16 Aug 2007 06:37:30 GMT
Using same thread pool for I/O processing as request handling 

                 Key: DIRSERVER-1019
             Project: Directory ApacheDS
          Issue Type: Bug
    Affects Versions: pre-1.0, 1.0-RC1, 1.0-RC2, 1.0-RC3, 1.0-RC4, 1.0, 1.5.0, 1.0.1, 1.0.2
            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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