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From "Bryan Pendleton (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1219) jdbcapi/checkDataSource.java and jdbcapi/checkDataSource30.java hang intermittently with client
Date Sat, 13 May 2006 17:49:09 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1219?page=comments#action_12383402 ] 

Bryan Pendleton commented on DERBY-1219:
----------------------------------------

I think the interrupt.diff patch is very close to being good, but I think there are some 
synchronization issues to resolve. The interrupt.diff patch is very reliable on my
Windows environment; that is, I cannot reproduce the hang with that diff in place.

In my Linux environment, however, the test still hangs with that patch. However, if
I introduce even very small timing changes into the test; for example if I put a
println statement into a critical section of the getNextSession() logic, then the
hang disappears.

So I think that the interrupt.diff patch can perhaps be combined with some
additional synchronization as Deepa suggested earlier, to solve some of the
races between the Network Server restart, the DRDAConnThreads calling
getNextSession, and the ClientThread logic involving creating a new session
and conditionally creating a new thread.

I'll continue to fiddle with the configuration that I have in which I can still provoke
a hang, and see what I can do to understand it better.


> jdbcapi/checkDataSource.java and jdbcapi/checkDataSource30.java hang intermittently with
client
> -----------------------------------------------------------------------------------------------
>
>          Key: DERBY-1219
>          URL: http://issues.apache.org/jira/browse/DERBY-1219
>      Project: Derby
>         Type: Test

>   Components: Network Server, Network Client
>     Versions: 10.2.0.0
>  Environment: More often on jdk 1.5 or jdk 1.6 but hangs on jdk 1.4.2 as well
>     Reporter: Kathey Marsden
>     Assignee: Bryan Pendleton
>     Priority: Minor
>  Attachments: client_stack_trace_050306.txt, drda_traces_050206.zip, interrupt.diff,
no-sessions-for-closed-threads.diff, server_stack_trace_050306.txt, skipThreads.diff, testfiles_afterhang.zip,
traces_on_hang.txt
>
> The tests checkDataSource.java and checkDataSource30.java 
> hang intermittently especially with jdk 1.5.
> Attached is the test run output and traces when the server is started separately.
> 1) Enable checkDataSource30.java by taking it out of functionTests/suites/DerbyNetClient.exclude.
> 2) Run the test with client.
> java -Dij.exceptionTrace=true -Dkeepfiles=true -Dframework=DerbyNetClient org.apache.derbyTesting.functionTests.harness.RunTest
jdbcapi/checkDataSource30.java
> Attachements:
>  testfiles_after_hang.zip - Test directory.
>  traces_on_hang.txt  - Server side traces obtained by starting the server separately
before running the test.
> I wish I had time to work on this right now as I would really like to see this valuable
test in the suite, but hopefully someone else will pick it up.

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