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From "Knut Anders Hatlen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-1817) Race condition in network server's thread pool
Date Mon, 11 Sep 2006 11:28:25 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1817?page=all ]

Knut Anders Hatlen updated DERBY-1817:
--------------------------------------

    Attachment: 1817-4-cleanup.diff
                1817-4-cleanup.stat

The attached patch (1817-4-cleanup) contains the cleanup suggested by Bryan. It is independent
of the 1817-3-sync patch, which is not committed yet.

Description:
  - moves generation of connection number into addSession()
  - adds new method removeThread() which can be used instead of getThreadList().remove()
  - removes methods that are no longer used
  - makes methods that are only used by NetworkServerControlImpl private

> 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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