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Date: Mon, 13 Jun 2005 15:21:51 +0200 (CEST)
From: "Tomohito Nakayama (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-273) The
 derbynet/dataSourcePermissions_net.java test fails intermittently
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    [ http://issues.apache.org/jira/browse/DERBY-273?page=comments#action_12313462 ] 

Tomohito Nakayama commented on DERBY-273:
-----------------------------------------

Regarding modify-1, there was a wrong guess in my previous thought.

I thought database was shutdown before closing connection , then connection remains in the dataSourcePermissions test.
However, I found connection was closed before shutting down database in the test.


To know why connection remains, 
I read the code around DRDAConnThread.
http://svn.apache.org/repos/asf/incubator/derby/code/trunk/java/drda/org/apache/derby/impl/drda/DRDAConnThread.java

In last part of DRDAConnThread#run() ,
I found  closing connection at server was caused by DRDAProtocolException that stands for disconnection.

This exeption was caused in DDMReader and DDMWriter , calling DRDAConnThread#markCommunicationsFailure when catching IOException.
http://svn.apache.org/repos/asf/incubator/derby/code/trunk/java/drda/org/apache/derby/impl/drda/DDMReader.java
http://svn.apache.org/repos/asf/incubator/derby/code/trunk/java/drda/org/apache/derby/impl/drda/DDMWriter.java


I guess client close the connection one-sidely and 
DRDAProtocolException representing disconnection happens in server , 
and rollback and close connection at server follows .

Because client is one-side player , client doesn't know wheter server finished work of closing connection .


Then ... how to ensure finishing closing connection before shutting down database ...? 

> The derbynet/dataSourcePermissions_net.java test fails intermittently
> ---------------------------------------------------------------------
>
>          Key: DERBY-273
>          URL: http://issues.apache.org/jira/browse/DERBY-273
>      Project: Derby
>         Type: Bug
>  Environment: 1.4.2 JVM (both Sun and IBM)
>     Reporter: Jack Klebanoff
>     Assignee: Tomohito Nakayama

>
> The test fails in the derbyall/derbynetclientmats/derbynetmats suite stack with the following diff:
> *** Start: dataSourcePermissions_net jdk1.4.2 DerbyNetClient derbynetmats:derbynetmats 2005-05-11 04:24:11 ***
> 17a18,19
> > org.apache.derby.iapi.services.context.ShutdownException: 
> > agentThread[DRDAConnThread_2,5,derby.daemons]
> Test Failed.

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