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From "Michael Gottschalk (JIRA)" <>
Subject [jira] Created: (AMQ-2161) Unmatched acknowledege Exception and duplicate received messages in XA transaction with prefetch limit != 1
Date Fri, 13 Mar 2009 16:38:40 GMT
Unmatched acknowledege Exception and duplicate received messages in XA transaction with prefetch
limit != 1

                 Key: AMQ-2161
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 5.2.0
         Environment: Ubuntu Linux 2.6.24-22
Processor with 2 cores
Java 1.6.0_02-b05
Bitronix Transaction Manager 1.3.2
            Reporter: Michael Gottschalk

I tried to read about 200000 messages from a queue. Reading was performed in XA transactions
in chunks of 1000 messages per transaction.
After reading some messages (I almost never came above 100000 read messages), an exception
occured in the activemq log file (data/activemq.log).
In my application, null was returned for the message. Reading of further messages always returned
null until a new transaction was opened.
No exception was thrown and the transaction was not marked as rolled back.
After that, the number of read messages in my application and the number of dequeued messages
I saw in the activemq JMX interface was often no longer in sync. It seems to me that activemq
was of the opinion that the transaction was rolled back while my application was not.
Another indication is that my application always gets one of the read messages a second time
some time after the incident.

When I set the prefetchPolicy.all to 1, the problem seems to disappear. Then, there are no
more exceptions in the log file and a null message is never returned.
I also tried with prefetchPolicy.all=0, but that created a different problem: there are no
exceptions either, but after some time, the application hang completely in the reader thread
and never returned. I tried this only once, but probably this should also be investigated,
if there is no easy explanation.

I wrote a test case that demonstrates the bug (see attachment). It always occured for 200000
messages, and almost always for 100000 messages. For 20000 messages, for example, the problem
almost never occurs. For executing the test, I first stopped the activemq server, deleted
the data directory and then restarted the server. After that, I executed the test, which first
writes all messages into a queue and then tries to read them back.

The configuration of the broker in my activemq.xml configuration file:

    <broker xmlns="" brokerName="localhost" dataDirectory="${activemq.base}/data"

                    <policyEntry queue=">" memoryLimit="2000mb"/>
                    <policyEntry topic=">" memoryLimit="5mb">
            <managementContext createConnector="false"/>


            <amqPersistenceAdapter syncOnWrite="false" directory="${activemq.base}/data"
maxFileLength="20 mb"
                                   indexBinSize="131072" indexPageSize="128kb" />

            <sslContext keyStore="file:${activemq.base}/conf/broker.ks" keyStorePassword="password"
trustStore="file:${activemq.base}/conf/broker.ts" trustStorePassword="password"/>

                    <memoryUsage limit="1000 mb"/>
                    <storeUsage limit="2 gb" name="foo"/>
                    <tempUsage limit="2000 mb"/>

            <transportConnector name="openwire" uri="tcp://localhost:61616" />


The configuration of the transaction manager (from the Spring application context):

<bean id="btmConfig"
        class="" factory-method="getConfiguration">
        <property name="serverId" value="${processes.serverId}"/>
        <property name="logPart1Filename" value="${processes.bitronix.logPart1Filename}"
        <property name="logPart2Filename" value="${processes.bitronix.logPart2Filename}"
        <property name="warnAboutZeroResourceTransaction" value="false" />
    <bean id="bitronixTransactionManager" destroy-method="shutdown" depends-on="btmConfig"
        class="" factory-method="getTransactionManager">
        <property name="transactionTimeout" value="600000"/>
    <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManager" ref="bitronixTransactionManager" />
        <property name="userTransaction" ref="bitronixTransactionManager" />
        <property name="autodetectTransactionManager" value="false" />
        <property name="autodetectUserTransaction" value="false" />
        <property name="defaultTimeout" value="600000" />
    <bean id="transactionTemplate"
        <property name="transactionManager" ref="transactionManager" />

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