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From "Rob Davies (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2103) Memory leak when marshaling ActiveMQTextMessage to persistent store
Date Wed, 11 Feb 2009 07:35:59 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rob Davies resolved AMQ-2103.
-----------------------------

       Resolution: Fixed
    Fix Version/s: 5.3.0

Patch applied in SVN revision 743258

> Memory leak when marshaling ActiveMQTextMessage to persistent store
> -------------------------------------------------------------------
>
>                 Key: AMQ-2103
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2103
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.0.0
>         Environment: ActiveMQ 5.0.0.20-fuse
>            Reporter: Trevor Pounds
>            Assignee: Rob Davies
>             Fix For: 5.3.0
>
>         Attachments: AMQ-2103.diff, Duplicate Message Data (Internal Marshalling).png,
heap_100_1MB_messages.png, jhat_ActiveMQTextMessage_0xe837a478.htm, jhat_ByteSequence_0xe837a5c0.htm,
jhat_ByteSequence_data_0xe837adb0.htm
>
>
> When an org.apache.activemq.command.ActiveMQTextMessage is marshaled into the persistence
store some portion of the messages are stored in memory (i.e. pending cursor/consumer dispatch
queue).  The messages stored in memory have the potential to cause the broker to run out of
memory because org.apache.activemq.command.ActiveMQTextMessage objects can store the data
twice, once in the 'text' field and once in the 'content' field.  Normally this isn't a problem
since the 'content' field is cleared when the message is being used in a client application
(i.e. by calling getText() clears content).  The problem occurs when a consumer is slow and
a large number of messages are sitting around on the broker in pending/dispatch memory space.
 The message is marshaled for the store and then persisted to disk and copied to pending memory
when space is available.
> This bug affects any ActiveMQ*Message object that does not clear its temporary data (i.e.
'text' field) once it has been marshaled.  When a message is marshaled we should null the
derived objects memory space once the data has been written to the parent object's 'content'
field.

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