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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-6788) NetworkConnection can occupy large amounts of direct memory causing the broker to go OutOfMemory
Date Fri, 13 Nov 2015 15:52:11 GMT

    [ https://issues.apache.org/jira/browse/QPID-6788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15004156#comment-15004156
] 

ASF subversion and git services commented on QPID-6788:
-------------------------------------------------------

Commit 1714224 from orudyy@apache.org in branch 'java/trunk'
[ https://svn.apache.org/r1714224 ]

QPID-6788: Allow web socket connection to suspend message assignment on reaching the outbound
message network buffer limit

> NetworkConnection 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
>            Assignee: Lorenz Quack
>         Attachments: 0001-QPID-6788-Java-Broker-Limit-the-amount-of-memory-tha.patch,
0001-QPID-6788-Java-Broker-Limit-the-amount-of-memory-tha.patch
>
>
> 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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