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Posted to user@storm.apache.org by Stephen Powis <sp...@salesforce.com> on 2016/03/02 19:49:04 UTC

New Concurrent modification exception's after storm 0.10.0

Hey!

Did anything change between storm 0.9.5 and 0.10.0 regarding
ConcurrentModificationExceptions and how they are detected?  We've had a
topology running for the last 6months or so and never saw this exception.

After upgrading to Storm 0.10.x which didn't require any changes to our
topology/bolt/business logic, we're now seeing these intermittently and
have been struggling to see where we've gone wrong -- We don't seem to be
modifying values in the emitted tuples anywhere after emitting.

Thanks!
Stephen

Re: New Concurrent modification exception's after storm 0.10.0

Posted by Stephen Powis <sp...@salesforce.com>.

So after spending another hour staring at the code, I've realized that we
are indeed emitting instances of a List object that is re-used elsewhere in
the bolt.... (doh!)  I'm guessing something did change in the framework
between 0.9.x and 0.10.x, but its definitely caught me doing something
stupid :)

Thanks!

On Thu, Mar 3, 2016 at 1:01 PM, P. Taylor Goetz <pt...@gmail.com> wrote:

> Hi Stephen,
>
> Can you provide a stack trace that indicates where this is occurring?
>
> -Taylor
>
>
> > On Mar 2, 2016, at 1:49 PM, Stephen Powis <sp...@salesforce.com> wrote:
> >
> > Hey!
> >
> > Did anything change between storm 0.9.5 and 0.10.0 regarding
> ConcurrentModificationExceptions and how they are detected?  We've had a
> topology running for the last 6months or so and never saw this exception.
> >
> > After upgrading to Storm 0.10.x which didn't require any changes to our
> topology/bolt/business logic, we're now seeing these intermittently and
> have been struggling to see where we've gone wrong -- We don't seem to be
> modifying values in the emitted tuples anywhere after emitting.
> >
> > Thanks!
> > Stephen
>
>

Re: New Concurrent modification exception's after storm 0.10.0

Posted by "P. Taylor Goetz" <pt...@gmail.com>.

Hi Stephen,

Can you provide a stack trace that indicates where this is occurring?

-Taylor


> On Mar 2, 2016, at 1:49 PM, Stephen Powis <sp...@salesforce.com> wrote:
> 
> Hey!
> 
> Did anything change between storm 0.9.5 and 0.10.0 regarding ConcurrentModificationExceptions and how they are detected?  We've had a topology running for the last 6months or so and never saw this exception.
> 
> After upgrading to Storm 0.10.x which didn't require any changes to our topology/bolt/business logic, we're now seeing these intermittently and have been struggling to see where we've gone wrong -- We don't seem to be modifying values in the emitted tuples anywhere after emitting.
> 
> Thanks!
> Stephen