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From "Andrew Kennedy (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (QPID-3028) Java broker uses excessive amounts of memory to service 0-10 connections
Date Fri, 04 Mar 2011 10:49:37 GMT

     [ https://issues.apache.org/jira/browse/QPID-3028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Kennedy resolved QPID-3028.
----------------------------------

    Resolution: Fixed

Review OK

> Java broker uses excessive amounts of memory to service 0-10 connections
> ------------------------------------------------------------------------
>
>                 Key: QPID-3028
>                 URL: https://issues.apache.org/jira/browse/QPID-3028
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>    Affects Versions: 0.6, 0.8
>            Reporter: Robbie Gemmell
>            Assignee: Andrew Kennedy
>            Priority: Critical
>             Fix For: 0.9
>
>
> The Java broker uses excessive amounts of memory to service 0-10 connections. There are
a number of reasons for this, such as:
> - Use of an arbitrary 64000 element array in the Assembler to store incomplete incoming
per-channel data.
> - Use of per-connection ThreadLocals for the BBDecoder in the Assembler interacting with
the thread pool threads moving between connections, leading to an NxM number of BBDecoders
in use.
> - Use of per-connection ThreadLocals for the BBEncoder in the Disassembler interacting
with the thread pool threads moving between connections, leading to an NxM number of BBEncoders
in use.
> - BBDecoder maintaining a hard reference to the last ByteBuffer it used.
> - The binary->String cache within BBDecoder maintaining a hard reference to the entire
backing array for the network read buffer which contained the cached binary, rather than just
the bit being cached.

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