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Posted to dev@tomcat.apache.org by Narendra Sarkar <na...@gmail.com> on 2009/09/04 16:28:06 UTC
Re: FW: dbcp pool evictor deadlock?
Hi,
I would like to download jdbc-pool library. However, I am unable to find the
library in jakarata.apache.org.
Can anybody tell me where from I can download this file?
Regards,
Narendra
>
> ---------- Forwarded message ----------
> From: Eric B. <eb...@hotmail.com>
> Date: Tue, Jun 23, 2009 at 10:13 AM
> Subject: Re: dbcp pool evictor deadlock?
> To: dev@tomcat.apache.org
>
>
> "Mark Thomas" <ma...@apache.org> wrote in message
> news:4A40E12C.2070504@apache.org...
> > Narendra Sarkar wrote:
> >> Hi,
> >> We have a multi threaded environment. We have noticed that thread blocks
> >> for
> >> 10 to 20 minutes due DBCP getConnection method call. Then, we
> >> investigated
> >> the source code of DBCP(commons-dbcp-1.2.1-PII.jar) and noticed that
> >> createConnection method is synchronized. This problem occur more
> >> frequently
> >> when we have lower value of MaxIdleConnection parameter. After
> increasing
> >> the value of MaxIdleConnection parameter, frequency of blocking get
> >> reduced.
> >> We then replaced DBCP connection pooling with Oracle Connection pooling
> >> (ojdbc14.jar) and never encountered blocking issue.
> >>
> >> I think the issue is with that createConnection method of DBCP
> >> synchronization. We have taken Thread dump to do above analysis.
> >
> > Yep, known issues with commons-pool. Should be fixed in 1.5.1. Trunk has
> > been updated. Proposed for 6.0.x and 5.5.x. Alternatively, there is the
> > new JDBC pool module.
>
> I'm a little confused now. Filip pointed me to the jdbp-1.0.5 package.
> Is
> that just repackaged versions of dbcp 1.2.2/pool 1.5? If not, what
> versions
> of dbcp/pool are contained within there?
>
> If the fix in commons-pool is in 1.5.1, am I still expecting concurrency
> problems if upgrading 1.5? What would be the best move?
>
> Thanks,
>
> Eric
>
>
>
>
>
>
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> To unsubscribe, e-mail: dev-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: dev-help@tomcat.apache.org
>
>
>
Re: FW: dbcp pool evictor deadlock?
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
http://people.apache.org/~fhanik/jdbc-pool/v1.0.7.1/
Filip
On 09/04/2009 08:28 AM, Narendra Sarkar wrote:
> Hi,
> I would like to download jdbc-pool library. However, I am unable to find the
> library in jakarata.apache.org.
> Can anybody tell me where from I can download this file?
>
> Regards,
> Narendra
>
>
>> ---------- Forwarded message ----------
>> From: Eric B.<eb...@hotmail.com>
>> Date: Tue, Jun 23, 2009 at 10:13 AM
>> Subject: Re: dbcp pool evictor deadlock?
>> To: dev@tomcat.apache.org
>>
>>
>> "Mark Thomas"<ma...@apache.org> wrote in message
>> news:4A40E12C.2070504@apache.org...
>>
>>> Narendra Sarkar wrote:
>>>
>>>> Hi,
>>>> We have a multi threaded environment. We have noticed that thread blocks
>>>> for
>>>> 10 to 20 minutes due DBCP getConnection method call. Then, we
>>>> investigated
>>>> the source code of DBCP(commons-dbcp-1.2.1-PII.jar) and noticed that
>>>> createConnection method is synchronized. This problem occur more
>>>> frequently
>>>> when we have lower value of MaxIdleConnection parameter. After
>>>>
>> increasing
>>
>>>> the value of MaxIdleConnection parameter, frequency of blocking get
>>>> reduced.
>>>> We then replaced DBCP connection pooling with Oracle Connection pooling
>>>> (ojdbc14.jar) and never encountered blocking issue.
>>>>
>>>> I think the issue is with that createConnection method of DBCP
>>>> synchronization. We have taken Thread dump to do above analysis.
>>>>
>>> Yep, known issues with commons-pool. Should be fixed in 1.5.1. Trunk has
>>> been updated. Proposed for 6.0.x and 5.5.x. Alternatively, there is the
>>> new JDBC pool module.
>>>
>> I'm a little confused now. Filip pointed me to the jdbp-1.0.5 package.
>> Is
>> that just repackaged versions of dbcp 1.2.2/pool 1.5? If not, what
>> versions
>> of dbcp/pool are contained within there?
>>
>> If the fix in commons-pool is in 1.5.1, am I still expecting concurrency
>> problems if upgrading 1.5? What would be the best move?
>>
>> Thanks,
>>
>> Eric
>>
>>
>>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: dev-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: dev-help@tomcat.apache.org
>>
>>
>>
>>
>
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