failover ConnectionStateTracker can lead to OOM with TextMessages
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Key: AMQ-3352
URL: https://issues.apache.org/jira/browse/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
https://issues.apache.org/jira/browse/AMQ-2585 - without that change the state
tracker capacity would shrink.
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