Keith Wall created QPID-7753:
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Summary: Sparsely occupied message buffers may lead to
java.lang.OutOfMemoryError: Direct buffer memory
Key: QPID-7753
URL: https://issues.apache.org/jira/browse/QPID-7753
Project: Qpid
Issue Type: Bug
Components: Java Broker
Affects Versions: qpid-java-6.1, qpid-java-6.0
Reporter: Keith Wall
Some Broker usage patterns can lead to the Broker failing with a
"java.lang.OutOfMemoryError: Direct buffer memory" error.
For the condition to manifest a producing application needs to use a single
connection for the production of messages. Some messages need to be consumed
quickly whilst others remain on the Broker. This pattern might result from:
# the consuming application using message selectors to selectively consume some
messages whilst leaving others on the Broker.
# the use of 'out of order' queue types (priority/sorted etc) where lower
priority items are left of the Broker.
# the producing application routing messages to multiple queues and the
consuming application draining some queues but not others.
The problem arises owing to the buffering strategy under the IO layer.
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