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From "Bernd Gutjahr (JIRA)" <>
Subject [jira] [Created] (ARTEMIS-485) Global client thread pool is not unbounded by default
Date Fri, 15 Apr 2016 06:06:25 GMT
Bernd Gutjahr created ARTEMIS-485:

             Summary: Global client thread pool is not unbounded by default
                 Key: ARTEMIS-485
             Project: ActiveMQ Artemis
          Issue Type: Bug
    Affects Versions: 1.2.0
            Reporter: Bernd Gutjahr

With the change #263, "Allow configurable size for client global pools", the default global
client thread pool has been changed from an unbounded thread pool to a fixed size pool. In
addition, that changed made it impossible to configure the thread pool as unbounded.
With the unbounded thread pools, client threads are created on demand, but get cleared after
an idle time of one minute. In normal client operations, there weren't many client threads.
With the change to a fixed size thread pool, the pool quickly fills up with the configured
number of client threads, which never go away.
I have seen that each thread had ~500kB allocated, which leads to 250MB  with the default
of 500 threads.
Therefore, I would like to have the default changed back to -1 (= unbounded thread pool),
as it also documented in the "Client-Side Thread Management" chapter of the user documentation.
The code also needs to be fixed to handle -1 correctly, as it currently changes it to 2.

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