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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2556) Memory leaks with XA Transactions (case of read-only transactions)
Date Thu, 01 Apr 2010 23:29:08 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-2556.
-----------------------------

       Resolution: Fixed
    Fix Version/s: 5.4.0

thanks for the great test case, issue resolved on trunk in r930135
state on the client, broker and failover transport needed to be reclaimed on prepare readonly.

> Memory leaks with XA Transactions (case of read-only transactions)
> ------------------------------------------------------------------
>
>                 Key: AMQ-2556
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2556
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker, JMS client
>    Affects Versions: 5.1.0, 5.2.0, 5.3.0
>         Environment: ActiveMQ 5.3.0
> Atomikos Transactions Essentials 3.5.8
> Spring 2.5.6
> Oracle 11g (thin driver version 11.1.0.7.0)
>            Reporter: Daniel Santos
>            Assignee: Gary Tully
>             Fix For: 5.4.0
>
>         Attachments: XAConsumer.zip
>
>
> Some transaction related information are not released in case of read-only transactions
(where not messages have been consumed or produced) by broker and client, that causes an OutOfMemory
after running some time.
> Fields that hold these "transaction related information" are (at least) :
> - {{org.apache.activemq.state.ConnectionState.transactions}}
> - {{org.apache.activemq.TransactionContext.ENDED_XA_TRANSACTION_CONTEXTS}}
> After serach, it seems that the case of read-only XA transactions (that terminates at
prepare time) has been missed in some code like :
> - {{org.apache.activemq.broker.TransportConnection}} that puts TransactionState in {{org.apache.activemq.state.ConnectionState.transactions}}
at the beginning, release them at commit (or rollback) time *but not at prepare time where
result is {{XAResource.XA_RDONLY}}*
> - {{org.apache.activemq.TransactionContext}} that do the same mistake via ENDED_XA_TRANSACTION_CONTEXTS
in prepare()
> _Note that the case of read-only transactions seems correctly done by {{org.apache.activemq.transaction.XATransaction}}
(very interesting comment here http://fisheye6.atlassian.com/browse/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/transaction/XATransaction.java?r=809940#l175)_

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