[Hawkular-dev] Hawkular-113

[Jay Shaughnessy]

Just a note about a workaround pushed to master for 
https://issues.jboss.org/browse/HAWKULAR-113.   The root cause may or 
may not be the same as for HWKMETRICS-47, it's not clear, but the 
behavior is similar.  After a lot of research we can see that invoking 
concurrent, asynchronous EJB methods, that perform rest posts to 
metrics, can hang the threads in WFly 8.2 (used by Kettle).

So, beware the @Asynchronous annotation on pooled EJBs, if the method is 
performing posts.  With no obvious fix, the only choice I could see was 
to workaround the issue, and make the method synchronous.

This was the issue where if you were to add multiple urls to Hawkular, 
you would quickly end up with all URLs reporting DOWN and basically the 
application was locked up, with a bunch of hanging threads.

Jay
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