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From "Knut Anders Hatlen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1817) Race condition in network server's thread pool
Date Sat, 09 Sep 2006 15:50:23 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1817?page=comments#action_12433616 ] 
            
Knut Anders Hatlen commented on DERBY-1817:
-------------------------------------------

Thank you for reviewing the patch, Bryan! I think you are right, those methods could be removed
or made private now. I will address that in a follow-up patch. Committed 1817-2.diff into
trunk with revision 441802. Leaving the issue open until the suggested clean-up of NetworkServerControlImpl
has been performed.

> Race condition in network server's thread pool
> ----------------------------------------------
>
>                 Key: DERBY-1817
>                 URL: http://issues.apache.org/jira/browse/DERBY-1817
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.2.1.0
>            Reporter: Knut Anders Hatlen
>         Assigned To: Knut Anders Hatlen
>         Attachments: 1817-2.diff, 1817.diff, 1817.stat
>
>
> If there is a free DRDAConnThread when a client connects to the network server, the session
is put into a queue from which one of the free DRDAConnThreads can pick it up. However, if
another client connects after the session was put into the queue, but before the DRDAConnThread
has picked it up, one might end up with more sessions in the queue than there are free threads.
This can lead to hangs like the ones that we currently see in many of Ole's tests (for instance
checkDataSource - http://www.multinet.no/~solberg/public/Apache/TinderBox_Derby/testlog/SunOS-5.10_i86pc-i386/440518-derbyall_diff.txt).

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