[jira] [Created] (QPID-6788) NonBlockingConnection can occupy large amounts of direct memory causing the broker to go OutOfMemory

["Lorenz Quack (JIRA)" <ji...@apache.org>]

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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