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From Hugi Thordarson <h...@karlmenn.is>
Subject Re: Reconnecting automatically after DB downtime
Date Mon, 07 Mar 2016 20:45:36 GMT
Thanks John! I’m going to try my hand at HikariCP.

Are there any examples anywhere on how to configure Cayenne to use a third party connection
pool?

Cheers,
- hugi




> On 7. mar. 2016, at 20:39, John Huss <johnthuss@gmail.com> wrote:
> 
> EOF can do JNDI, but that's not going to do anything to fix your problem.
> 
> The connection pool in cayenne had some changes somewhat recently so it's
> entirely possible there are bugs.
> 
> In practice it turns out many people don't use the connection pool built-in
> to Cayenne at all, and rather use a third-party connection pool, of which
> there are several.  The cayenne one is decent, but it is very limited in
> functionality and less robust due to having a smaller user base and being a
> non-core feature.
> 
> You can use another pool like:
> hikari <https://github.com/brettwooldridge/HikariCP> - If I was starting a
> new project I'd use this
> tomcat-jdbc <https://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html> -
> This is what I currently use
> commonds-dbcp <https://commons.apache.org/proper/commons-dbcp/>
> c3po <http://www.mchange.com/projects/c3p0/>
> 
> The main reason I turned to a third-party connection pool was to get
> fair-scheduling which will provide connections to whoever has been waiting
> the longest, which helps avoid unnecessary errors caused by serving
> requests out of order.
> 
> John
> 
> On Mon, Mar 7, 2016 at 2:31 PM Michael Gentry <mgentry@masslight.net> wrote:
> 
>> Well, I'm not sure what you are using to run your web application, but
>> Tomcat, Jetty, JBoss, etc all have mechanisms to provide JNDI lookups of DB
>> connection pools.  You just tell Cayenne Modeler to use JNDI lookup and
>> give it the JNDI name, then configure the container to provide the DB
>> connection.
>> 
>> Is your WO application using EOF or Cayenne?  Been a while since I used WO,
>> but I'd be stunned if EOF cannot use a JNDI lookup as well.
>> 
>> mrg
>> 
>> 
>> On Mon, Mar 7, 2016 at 3:07 PM, Hugi Thordarson <hugi@karlmenn.is> wrote:
>> 
>>> Hi Michael,
>>> does using JNDI change anything about the connection itself, isn’t it
>> just
>>> a different method of looking up connection information?
>>> 
>>> But I probably can’t use it anyway since one of the apps is a WebObjects
>>> app and doesn’t provide a JNDI service (at least I’ve never used it).
>>> 
>>> Thanks,
>>> - hugi
>>> 
>>> 
>>>> On 7. mar. 2016, at 19:13, Michael Gentry <mgentry@masslight.net>
>> wrote:
>>>> 
>>>> Hi Hugi,
>>>> 
>>>> Since this appears to be a web-based application, can you switch to
>> using
>>>> JNDI?
>>>> 
>>>> mrg
>>>> 
>>>> 
>>>> On Mon, Mar 7, 2016 at 5:46 AM, Hugi Thordarson <hugi@karlmenn.is>
>>> wrote:
>>>> 
>>>>> Hi all,
>>>>> This is still happening, even after I added a validationQuery, our app
>>> is
>>>>> dying quite frequently :(.  I’m not quite sure how to debug this, is
>>> there
>>>>> any way for me to catch where connections are being opened in the code
>>> and
>>>>> at what location they’re hanging?
>>>>> 
>>>>> 
>>>>> 
>>> 
>> https://www.dropbox.com/s/8jkmh6513s6wwkn/Screenshot%202016-03-07%2010.21.53.png?dl=0
>>>>> 
>>>>> Cheer,
>>>>> - hugi
>>>>> 
>>>>> // Hugi Thordarson
>>>>> // http://www.loftfar.is/
>>>>> // s. 895-6688
>>>>> 
>>>>> 
>>>>> 
>>>>>> On 29. feb. 2016, at 11:25, Andrus Adamchik <andrus@objectstyle.org>
>>>>> wrote:
>>>>>> 
>>>>>> 
>>>>>>> On Feb 29, 2016, at 2:20 PM, Hugi Thordarson <hugi@karlmenn.is>
>>> wrote:
>>>>>>> 
>>>>>>> What does validationQuery do?
>>>>>> 
>>>>>> Periodically executes for each pooled connection, and kills
>> connections
>>>>> that throw during validation. So it ensures that all pooled
>> connections
>>> are
>>>>> in a good state.
>>>>>> 
>>>>>> Andrus
>>>>>> 
>>>>> 
>>>>> 
>>> 
>>> 
>> 


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