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From "Bryan Pendleton (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1817) Race condition in network server's thread pool
Date Mon, 11 Sep 2006 20:09:23 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1817?page=comments#action_12433966 ] 
            
Bryan Pendleton commented on DERBY-1817:
----------------------------------------

Both 1817-3 and 1817-4 look like good changes to me. Thanks for continuing
to clean up this code. I'm eager for you to have a look at DERBY-1326 now :)


> 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, 1817-3-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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