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https://issues.apache.org/activemq/browse/AMQ-2103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Trevor Pounds updated AMQ-2103:
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Attachment: jhat_ByteSequence_data_0xe837adb0.htm
attaching jhat heap analysis showing ActiveMQTextMessage->ByteSequence->byte
array object holding the message data.
> Memory leak when marshaling ActiveMQTextMessage to persistence 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
> Attachments: AMQ-2103.diff, Duplicate Message Data (Internal
> Marshalling).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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