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From Clinton Begin <clinton.be...@gmail.com>
Subject Re: interesting exception in 3.0
Date Sat, 08 May 2010 13:41:08 GMT
Hi Francois,

I can't recreate this problem.  I've verified in about 1000 unit tests with
different configurations that close is being called.  The only known and
verified case of this was with the ManagedTransaction, not the
JdbcTransaction.

Perhaps you can put together a simple unit test with HSQLDB or Derby (our
two unit testing DBs) and zip it up and attach it to a ticket.  Please let
me know, as I won't cut a release with a bug this serious, if it can be
verified.

Cheers,
Clinton

2010/5/7 François Schiettecatte <fschiettecatte@gmail.com>

> Clinton
>
> Thanks for pinging me.
>
> I have not had a chance to look at it, and it is still an issue, before
> rushing out and creating a jira ticket for it I wanted to look at the code
> diffs between the two releases, I will try to get to it later today or this
> WE.
>
> François
>
> On May 7, 2010, at 10:33 AM, Clinton Begin wrote:
>
> > 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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