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From Phil Steitz <>
Subject Re: [DBCP] Apparent deadlock related to getConnection
Date Wed, 22 Apr 2015 13:20:25 GMT
On 4/21/15 10:43 PM, Shawn Heisey wrote:
> On 4/21/2015 6:28 PM, Phil Steitz wrote:
>> Thanks for providing the full stack traces, Shawn.  I assume the
>> pool config is the same that you posted before, right?  Also, the
>> mysql driver seems to be taking initiative to try to clean up
>> abandoned connections itself.  That is holding some locks; but I
>> don't see any deadlocks in the dumps.  I will look more at this
>> later tonight.  I think it is possible there is a pool bug lurking
>> in here. 

Confirmed that what I was looking into was not a pool bug (actually
previously resolved bug).


>>  One question: are you seeing connections fail validation? 
>> I think you said you were testing on borrow / return.  Is that
>> right?  Are you just letting the pool destroy the bad ones or are
>> you destroying them yourself?
> Thanks for your reply.
> I have since learned that this was not an actual deadlock.
>   Somebody
> dropped entries into the config database which asked my program to
> reindex 56 million rows (nearly one third of the entire database) into
> Solr.  That is not the kind of thing I intended that capability to
> accomplish, because it takes WAY too long.
> My program was working fine ... but sending watchdog alarms every
> fifteen minutes because a "normal" cycle was taking hours longer than
> expected.  I removed the reindex entries and restarted the program
> instances, now everything is working fine again.
> Thanks,
> Shawn
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