Sebastian,
First of all, make sure that all your MEPs are handled correctly, ie.
every MessageExchange ends with either a DONE or ERROR status.
The best way to ensure scalability is by avoiding the use of sendSync()
and by using send() for all your MessageExchanges. When you use
sendSync(), that component thread is blocked until you receive an
answer. However, this also means that there is one less thread
available in the thread pool to handle new requests. You might end up
in a situation where all you threads are waiting on a sendSync(), while
the handling of the message is waiting for one of these threads to be
released. You can check this by looking at the threads in jconsole and
especially at their stack traces when the system gets blocked.
If you're already using send() everywhere and all MEPs are handled
correctly, but seda queues are still growing, you can tune the thread
pool for a specific component (as explained in
http://servicemix.apache.org/thread-pools.html) to allow it to handle
more messages concurrently.
Regards,
Gert
Sebastian Gomez wrote:
Hi everyone.
I'm about to finish a project using ServiceMix 3.2.2, and after doing some
stress tests I've found that if I send lots of messages to the same
servicemix-bean endpoint to do quite complex operations (they take a long
time and should return quite large amounts of data, including attachments),
the Seda Queue finally gets stuck. The only way I've found to "unstuck" it
is to restart ServiceMix (something I won't be able to do after handing in
my application).
Debugging I've seen my application reaches the SedaFlow "doSend" method, it
enqueues the packet correctly, but I suppose it never dequeues (how could I
see if this is true?).
I've seen using jconsole that servicemix-bean's Seda Queue size keeps
increasing as I send messages into my application, and never decreases, so
there must be something going wrong. I'd like to know if there's some known
issue involving this, and if luckily there's some kind of solution.
My project's deadline is near, so I'd really appreciate any help.
Thanks in advance.
Sebastian Gomez.
