Hi Xavier,
I attached the log file and with the debug trace and the threads dump.
I see that you are using a result cache. This one can hide the fact that
a backend is dead (if the query is already in the cache) and you don't
issue any write query. Do you experience a null result as well when you
disable the result cache?
While investigating your dump I saw that some threads where blocked
waiting for a connection to be free. Are you sure that connection pools
settings are correct and that you should not increase your pool size?
Hope this helps,
Emmanuel
--
Emmanuel Cecchet
Chief Scientific Officer, Continuent
Blog: http://emanux.blogspot.com/
Open source: http://www.continuent.org
Corporate: http://www.continuent.com
Skype: emmanuel_cecchet
Cell: +33 687 342 685
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