"out of sync" errors in log, stuck messages, and consumer count increasing in qpid broker

Solution Verified - Updated -

Issue

  • End JVM clients perceived slowness in the processing of messages in a queue
  • qpid-stat shows abnormally many consumers of the queue
  • some messages are stuck in the queue
  • client regularly logs "AMQException: timed out waiting for sync" errors

What caused this and how can we prevent it from happening again?

Environment

  • Red Hat Enterprise MRG Messaging
  • qpid-java client used within Spring Framework

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