[DERBY-1817] Race condition in network server's thread pool

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.2.1.6
• Fix Version/s: 10.2.1.6
• Component/s: Network Server
• Assignee: Knut Anders Hatlen
• Reporter: Knut Anders Hatlen
• Created: 06/Sep/06 15:46
• Updated: 19/Sep/06 06:55
• Resolved: 19/Sep/06 06:55

Description

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).

Issue Links

• is related to: DERBY-1326 Network server may abandon sessions when Derby system is shutdown and this causes intermittent hangs in the client
• relates to: DERBY-1757 checkDataSource30 produces no output, most likely hangs