Lorenz Quack created QPID-6788:
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Summary: NonBlockingConnection can occupy large amounts of direct
memory causing the broker to go OutOfMemory
Key: QPID-6788
URL: https://issues.apache.org/jira/browse/QPID-6788
Project: Qpid
Issue Type: Bug
Components: Java Broker
Affects Versions: qpid-java-6.0
Reporter: Lorenz Quack
Messages get passed to {{NonBlockingConnection}} in the {{send()}} method which
holds them in the private {{_buffers}} field. The {{doWrite()}} method consumes
the messages and disposes them from the IOThread. However, there is no limit on
how many messages/buffer can be in the {{_buffers}} variable.
In one test there were about 2000 {{QpidByteBuffers}} in {{_buffers}}
accounting for approximately 500 MBytes direct memory.
This happens can cause the Broker to go OutOfMemory especially when the client
is useing prefetch.
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