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https://issues.apache.org/jira/browse/QPID-6387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317112#comment-14317112
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ASF subversion and git services commented on QPID-6387:
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Commit 1659103 from [~k-wall] in branch 'qpid/trunk'
[ https://svn.apache.org/r1659103 ]
QPID-6387: [Java Client] Remove array optimisation from session/consumer maps
> ChannelToSessionMap/IdToConsumerMap array optimisation publishes in thread
> unsafe manner
> ----------------------------------------------------------------------------------------
>
> Key: QPID-6387
> URL: https://issues.apache.org/jira/browse/QPID-6387
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Reporter: Keith Wall
> Assignee: Keith Wall
> Fix For: 0.31
>
>
> Two internal classes within the Java Client (ChannelToSessionMap /
> IdToConsumerMap) use an optimisation which hopes to permit 'fast access'
> first sixteen sessions (or consumers) by making use on an array. The array
> is written by one thread and then read by others. Unfortunately, the
> read/writes are not protected using a memory barrier so it is possible a
> thread may see a stale value, and this could lead to incorrect program
> behaviour.
> It is safer (and simpler) to replace the data structure with one backed by a
> ConcurrentHashMap.
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