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From "Keith Wall (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-6766) [Java Broker/Message Stores] Chunk message content in order to optimise memory usage
Date Mon, 25 Apr 2016 08:31:12 GMT

    [ https://issues.apache.org/jira/browse/QPID-6766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15256069#comment-15256069

Keith Wall commented on QPID-6766:

It was decided to defer this work for a later release quid-java-7.0.0.    We will also make
sense to include work that evolves the store into something better suited to store AMQP 1.0

> [Java Broker/Message Stores] Chunk message content in order to optimise memory usage
> ------------------------------------------------------------------------------------
>                 Key: QPID-6766
>                 URL: https://issues.apache.org/jira/browse/QPID-6766
>             Project: Qpid
>          Issue Type: Improvement
>          Components: Java Broker
>            Reporter: Alex Rudyy
>             Fix For: qpid-java-7.0.0
> At the moment, we store message content in BDB Message Store in one chunk. On content
saving we create a byte array and copy content bytes from a direct memory into heap in order
to save that on disk. As result, the message content is fully duplicated in direct memory
and heap. Such implementation causes an extensive and inefficient heap usage on storing of
big messages which might cause OOM errors due to heap consumption on message saving. We can
optimize heap memory usage by saving message in chunks with a size equal to Direct Byte Buffer
size which is used to hold content in the direct  memory.

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