[ 
http://issues.apache.org/jira/browse/DERBY-529?page=comments#action_12360635 ] 

A B commented on DERBY-529:
---------------------------

Unfortunately (or maybe fortunately? ;), I was never able to come up with a 
concrete scenario.  As the notes in the bug say, one would need to "figure out 
1) if it is actually possible (and if so, can we get a repro?), and 2) if so, 
how do we fix it?".  So I wasn't aware of any definite scenarios where this 
could happen when I filed the issue, and I haven't come across any since then.  
This was just a _potential_ hole that I noticed when I made the fix for 
DERBY-5, so I thought it'd be good to file it for tracking purposes.

I wish I could give you something more specific, but right now this is 
definitely more abstract than anything.  I can see where the problem could 
theoretically occur, but I do not have any actual examples...

> Data cleanup when exception is caught in Network Server may not be complete; 
> need follow-up investigation.
> ----------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-529
>          URL: http://issues.apache.org/jira/browse/DERBY-529
>      Project: Derby
>         Type: Sub-task
>   Components: Network Server
>     Versions: 10.1.1.0, 10.0.2.1, 10.2.0.0
>     Reporter: A B
>     Priority: Minor

>
> The patch that was submitted for DERBY-5 (svn revision 56215) solved the 
> specific problem described in that issue but, as indicated by the comments in 
> DERBY-5, it did not take into account cases where the buffer that we're 
> trying to "clear" (because of error) has already been transmitted to the 
> client, thus making it impossible to "undo" the write.  It'd be good to look 
> at this particular situation more to figure out 1) if it is actually possible 
> (and if so, can we get a repro?), and 2) if so, how do we fix it?
> I'm filing this as a sub-task so that we can track it separately from DERBY-5 
> (the specific issue described in DERBY-5 was correctly fixed by svn 56215 and 
> thus should be closed).

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