It was helpful in at least getting us to the lines of code that needed
some investigating. It appears to be a blocking issue in our JDBC
connections although we don't know what is the cause and why it is so
random. Spent quite a bit of time looking into issues with the Commons
jars, DBCP and Pool in particular. This thing just flat out deadlocks
and then the threads start building. Seen much discussion about this
very issue but even though we are using the latest Commons jars now, we
still have the issue.
I am looking at the DB Manager code I wrote to see if I am doing
something wrong in implementing the pooling. Based on the tracing
statements we put into the manager code, the pool is manging itself
nicely, the active connections even drop to zero as all connections are
returned to the pool so I know that we aren't leaving some connections
open by accident. Yet, we still get blocking showing up and the the
threads climb and eventually the app becomes completely unresponsive.
Just getting started on sorting this out but the dumps have been
invaluable it getting us to the source of the problem. Now, if we could
just figure out *why*.
Pete
Christopher Schultz wrote:
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Pete,
On 6/18/2009 10:52 AM, Pete Helgren wrote:
Thanks. Looking at the dump I can see there is an issue with a DB
manager we wrote (Blocking). I'll investigate further.
It's amazing what you can learn just from looking at a few thread dumps
of your running application. You may have already identified a big
problem (contended resource is stalling) which may be contributing to
your observations. On the other hand, it could be an entirely different
problem.
- -chris
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