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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 Tue, 12 Sep 2006 06:06:24 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1817?page=comments#action_12434070 ] 
            
Knut Anders Hatlen commented on DERBY-1817:
-------------------------------------------

Thank you for the quick reviews, Francois and Bryan!
Committed 1817-3 with revision 442462, and 1817-4 with revision 442463.
Leaving the issue open until the fixes have been merged to 10.2.

> 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
>             Fix For: 10.2.1.0
>
>         Attachments: 1817-2.diff, 1817-3-sync.diff, 1817-4-cleanup.diff, 1817-4-cleanup.stat,
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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