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From Clinton Begin <clinton.be...@gmail.com>
Subject Re: interesting exception in 3.0
Date Fri, 07 May 2010 14:33:02 GMT
Let me know if this is still a problem, and create a JIRA ticket if it is.
I should have some time this weekend to look into it.

Clinton

On Wed, May 5, 2010 at 9:16 PM, Clinton Begin <clinton.begin@gmail.com>wrote:

> Two things to do:
>
> * Create a JIRA ticket for this.  We'll continue conversation and
> investigation there.
>
> * Mount the source and step through one example transaction.  See if
> you can verify that close isn't being called, and possibly why.
>
> * Finally, out of curiosity, disable caching globally, and see if the
> problem remains.
>
> I did find one refactoring that is in this area.  I'll attempt to
> recreate and verify this too.
>
> Clinton
>
> 2010/5/5 François Schiettecatte <fschiettecatte@gmail.com>:
> > Clinton
> >
> > A little more information on this, I reverted back to 240 and the problem
> I reported did not occurs after a 24 hour run. I then went to the current
> release and the problem reappeared, everything else is the same, so there is
> an issue.
> >
> > What it looks like is going on is that connections are not being put back
> into the connection pool after they are closed and so time out when they are
> subsequently used by iBatis.  MySQL is set to close connections after 60
> seconds and the pool is set to close them after being idle for 50 seconds.
> Yet what I am seeing is that connections are being used quite some time
> after the last packets have been sent over the wire:
> >
> > ### Error querying database.  Cause:
> com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link
> failure
> > The last packet successfully received from the server was 60,858
> milliseconds ago.  The last packet sent successfully to the server was 0
> milliseconds ago.
> > ### The error may involve
> dictionaries.Category.selectObjectByCategoryID-Inline
> > ### The error occurred while setting parameters
> > ### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:
> Communications link failure
> >
> > What it feels like is that iBatis is hanging onto the connection and
> reusing it at a later time.
> >
> > What do you need from me to track this down?
> >
> > Cheers
> >
> > François
> >
> >
> >
> > On May 1, 2010, at 4:28 PM, Clinton Begin wrote:
> >
> >> Then no, I don't believe there have been any changes related to
> >> connections or transactions between those versions.  You can have a
> >> look at the change log if you like:
> >>
> >>
> https://issues.apache.org/jira/secure/BrowseProject.jspa?id=10601&subset=-1
> >>
> >> Or the subversion history as well.
> >>
> >> Clinton
> >>
> >> 2010/5/1 François Schiettecatte <fschiettecatte@gmail.com>:
> >>> I am using JDBC, with C3P0 as my data source.
> >>>
> >>> Cheers
> >>> François
> >>>
> >>> On May 1, 2010, at 4:14 PM, Clinton Begin wrote:
> >>>
> >>>> The only code changes related to that were with managed transactions.
> >>>> Which transacion manager are you using?  (JDBC or MANAGED)?
> >>>>
> >>>> Cheers,
> >>>> Clinton
> >>>>
> >>>> 2010/5/1 François Schiettecatte <fschiettecatte@gmail.com>:
> >>>>> Hi
> >>>>>
> >>>>> I grabbed the latest, greatest release of 3.0 from :
> >>>>>
> >>>>>
> http://people.apache.org/builds/ibatis/ibatis-3-core/ibatis-core-3.0-bundle.zip
> >>>>>
> >>>>> and am now getting an exception from time to time, but I was not
> getting it with the previous 3.0 beta release (240). I was wondering if
> there had been any change in the code which deals with connections and pool
> between those two releases. What it looks like to me is that connections are
> not being returned to the pool after I close the SqlSession. I have mysql
> set to timeout idle connections after 60 seconds and the connection pool to
> time out idle connections after 50 seconds. Again this was not an issue in
> 240.
> >>>>>
> >>>>> Any suggestions?
> >>>>>
> >>>>> Cheers
> >>>>>
> >>>>> François
> >>>>>
> >>>>>
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:61)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:53)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:38)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.sql.IBatis.selectObject(IBatis.java:554)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.db.dictionaries.Category.fromCategoryName(Category.java:118)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.db.items.ItemCategory.<init>(ItemCategory.java:201)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.db.items.ItemCategory.<init>(ItemCategory.java:227)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.db.items.Item.addItemCategory(Item.java:2182)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.crawler.processors.FeedProcessor.processEntryCategories(FeedProcessor.java:2494)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.crawler.processors.FeedProcessor.process(FeedProcessor.java:823)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.crawler.Worker.crawl(Worker.java:1313)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> com.poplar.crawler.Worker.crawlSourceKey(Worker.java:681)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker - com.poplar.crawler.Worker.run(Worker.java:591)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker -
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] ERROR
> com.poplar.crawler.Worker - java.lang.Thread.run(Thread.java:619)
> >>>>> 2010-05-01 01:54:20,609 [pool-1-thread-1] WARN
>  com.poplar.crawler.Worker - Failed to crawl the source key:
> 'C01240E19154BE7BDA3703F726D5A68190D4A540', exception:
> 'org.apache.ibatis.exceptions.IbatisException:
> >>>>> ### Error querying database.  Cause:
> com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link
> failure
> >>>>>
> >>>>> The last packet successfully received from the server was 104,024
> milliseconds ago.  The last packet sent successfully to the server was 0
> milliseconds ago.
> >>>>> ### The error may involve
> dictionaries.Category.selectObjectByCategoryName-Inline
> >>>>> ### The error occurred while setting parameters
> >>>>> ### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:
> Communications link failure
> >>>>>
> >>>>> The last packet successfully received from the server was 104,024
> milliseconds ago.  The last packet sent successfully to the server was 0
> milliseconds ago.'.
> >>>>>
> >>>>>
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