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From "Deepa Remesh (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1326) Network server may abandon sessions when Derby system is shutdown and this causes intermittent hangs in the client
Date Fri, 02 Jun 2006 19:48:33 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1326?page=comments#action_12414508 ] 

Deepa Remesh commented on DERBY-1326:
-------------------------------------

Hi Bryan, I don't think you are being picky. After reading your explanation, I agree the combined
patch still has some chance of causing a hang. As you explain, the following need not be always
true: "The interrupt calls and the added synchronization assure that freeThreads will become
0 before we start accepting new sessions ". So the assumption that we will have the right
value for freeThreads (=0) when a new session comes in after a restart does not hold good.


Keeping the code to reset "freeThreads = 0" during restart seems to be an option. But that
will cause the problem that you describe under "freeThreads counter maintenance" in http://wiki.apache.org/db-derby/NetworkServerSessionManagement.
The counter can become negative. 

If we plan to use this patch, we need to find out some way to ensure freeThreads counter is
maintained correctly. 











> Network server may abandon sessions when Derby system is shutdown and this causes intermittent
hangs in the client
> ------------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-1326
>          URL: http://issues.apache.org/jira/browse/DERBY-1326
>      Project: Derby
>         Type: Bug

>   Components: Network Server
>     Reporter: Deepa Remesh
>     Assignee: Bryan Pendleton
>  Attachments: repro1326.java, sessionMgmt1.diff, sessionMgmt1_and_nosessionsforclosedthreads.diff
>
> This issue was found when working on DERBY-1219. More details can be found in the comments
at http://issues.apache.org/jira/browse/DERBY-1219

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