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From "Francois Orsini (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1817) Race condition in network server's thread pool
Date Sat, 09 Sep 2006 18:49:24 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1817?page=comments#action_12433636 ] 
            
Francois Orsini commented on DERBY-1817:
----------------------------------------

  > It is true that maxThreads could potentially change after it has been copied into max
and before the new thread is added to the thread list.

This is what I meant Yes.

  > I don't think this is a problem since we could end up with more threads than maxThreads
regardless of synchronization
  > (for instance by setting maxThreads to 3 when there are five threads). However, I don't
see that expanding the synchronization should cause
  > any problems either, so I will update my patch. 

Great.

  > Thank you very much for looking at the patch!

My pleasure Knut ;)

> 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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