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From Samuel Cox <>
Subject ActiveMQ as a job/work broadcaster - Question regarding 'aborting' jobs
Date Thu, 21 Jun 2012 18:44:13 GMT

We use ActiveMQ and Camel to facilitate distributing jobs (JMS
messages) from a master to multiple workers.  We have to support the
ability to reliably abort these running jobs.  Currently, when our
master gets an abort request, it simply broadcasts this out to the
workers.  We don't (currently) keep track of which worker has a job,
nor do we even check the job queue to see if the message representing
the job has been dequeued.  Once upon a time, we did have the workers
sort of spin on aborts until it actually got the job (assuming it
didn't already have it) and then abort, but I argued that there has to
be a better way.

So...I'm asking for help finding a better way.  We do have some ideas;
however, I figured others must have surely already solved this, so I'm
checking for more elegant solutions.  I'm currently leaning towards a
queuebrowser + track worker that has job + target specific worker with
abort request.  It still seems like this might be overkill.  I just
need to guarantee that work can get aborted...

If you have ideas or can point me to tutorial/samples/etc., it would
be appreciated.

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