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From "Gary Tully (JIRA)" <>
Subject [jira] [Created] (AMQ-3352) failover ConnectionStateTracker can lead to OOM with TextMessages
Date Thu, 02 Jun 2011 17:12:47 GMT
failover ConnectionStateTracker can lead to OOM with TextMessages

                 Key: AMQ-3352
             Project: ActiveMQ
          Issue Type: Bug
          Components: JMS client
    Affects Versions: 5.5.0
            Reporter: Gary Tully
            Assignee: Gary Tully

With a reasonable large textmessage, the connection state tracker, which keeps an LRU cache
of messages for redelivery on failover, can grow. The problem is the use of message size,
which is approximated before marshaling. The approximation is > the encoded size so the
size increments on a track back are larger than the decrements on a track, which lease to
growth in the number of messages cached and can lead to an OOM.

The fix appears to be to not cache a copy of the message, such that the increment when the
message is evicted will reflect the decrement after marshaling. 

The change that exposed this issue is - without
that change the state tracker capacity would shrink.

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