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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-6067) OutOfMemoryError when expiring big amount of topic messages
Date Thu, 04 Aug 2016 10:46:20 GMT

    [ https://issues.apache.org/jira/browse/AMQ-6067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15407558#comment-15407558
] 

Gary Tully commented on AMQ-6067:
---------------------------------

Thank you [~cszczotka], that is indeed a bug, seems only return from recoverMessage is checked
by the store.
maybe https://github.com/apache/activemq/blob/e2b4ca2c59a316be91cf391c758a10e518dd3a1f/activemq-unit-tests/src/test/java/org/apache/activemq/usecases/ExpiredMessagesWithNoConsumerTest.java
can provide some inspiration for a unit test to capture this use case and the fix into the
future.

> OutOfMemoryError when expiring big amount of topic messages
> -----------------------------------------------------------
>
>                 Key: AMQ-6067
>                 URL: https://issues.apache.org/jira/browse/AMQ-6067
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 5.10.0
>            Reporter: Petr Havránek
>              Labels: durable, durable_subscription, expiration, jdbc, timeToLive,
>
> There is a problem in
> {noformat}
> org.apache.activemq.broker.region.Topic.expireMessagesTask
> {noformat}
> When there are big amount of topic messages that are going to be expired, this {{expireMessagesTask}}
loads all of the messages to memory. This causes
> {noformat}
> 2015-11-24 11:05:46.359 WARN  [ActiveMQ Broker[JmsEngineActivemqBroker] Scheduler] [Topic]
Failed to browse Topic: test-topic
> java.lang.OutOfMemoryError: Java heap space
> 	at oracle.sql.BLOB.getBytes(BLOB.java:204)
> 	at oracle.jdbc.driver.T4CBlobAccessor.getBytes(T4CBlobAccessor.java:464)
> 	at oracle.jdbc.driver.OracleResultSetImpl.getBytes(OracleResultSetImpl.java:676)
> 	at org.apache.commons.dbcp.DelegatingResultSet.getBytes(DelegatingResultSet.java:203)
> 	at org.apache.activemq.store.jdbc.adapter.DefaultJDBCAdapter.getBinaryData(DefaultJDBCAdapter.java:80)
> 	at org.apache.activemq.store.jdbc.adapter.DefaultJDBCAdapter.doRecover(DefaultJDBCAdapter.java:418)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
> 	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
> 	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
> 	at org.springframework.aop.interceptor.AbstractTraceInterceptor.invoke(AbstractTraceInterceptor.java:113)
> 	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
> 	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
> 	at $Proxy14.doRecover(Unknown Source)
> 	at org.apache.activemq.store.jdbc.JDBCMessageStore.recover(JDBCMessageStore.java:236)
> 	at org.apache.activemq.store.ProxyTopicMessageStore.recover(ProxyTopicMessageStore.java:62)
> 	at org.apache.activemq.broker.region.Topic.doBrowse(Topic.java:594)
> 	at org.apache.activemq.broker.region.Topic.access$100(Topic.java:65)
> 	at org.apache.activemq.broker.region.Topic$6.run(Topic.java:733)
> 	at org.apache.activemq.thread.SchedulerTimerTask.run(SchedulerTimerTask.java:33)
> 	at java.util.TimerThread.mainLoop(Timer.java:512)
> 	at java.util.TimerThread.run(Timer.java:462)
> {noformat}
> The problem happens when using JDBC persistency with ActiveMQ 5.10.0. After a short look
to source code, the same problem could be also with 5.12.1.
> Test case:
> - run ActiveMQ broker with JDBC persistency
> - create subscription to a topic, but do not receive the messages
> - send enough number of messages with short TimeToLive
> - when expireMessagesTask is scheduled, it tries to load all of the messages and causes
the OutOfMemoryError
> It would be fine if
> {noformat}
> org.apache.activemq.store.jdbc.JDBCMessageStore.recover(MessageRecoveryListener)
> {noformat}
> will be updated like this:
> {code:java}
> public void recover(final MessageRecoveryListener listener) throws Exception {
>   // Get all the Message ids out of the database.
>   TransactionContext c = persistenceAdapter.getTransactionContext();
>   try {
>     c = persistenceAdapter.getTransactionContext();
>     adapter.doRecover(c, destination, new JDBCMessageRecoveryListener() {
>       public boolean recoverMessage(long sequenceId, byte[] data) throws Exception {
>         if (listener.hasSpace()) {
>           Message msg = (Message)wireFormat.unmarshal(new ByteSequence(data));
>           msg.getMessageId().setBrokerSequenceId(sequenceId);
>           return listener.recoverMessage(msg);
>         } else {
>           logger.debug("Recovery limit of the messages has exceeded.");
>           return false;
>         }                    
>       }
>       public boolean recoverMessageReference(String reference) throws Exception {
>         if (listener.hasSpace()) {
>           return listener.recoverMessageReference(new MessageId(reference));
>         } else {
>           logger.debug("Recovery limit of the message references has exceeded.");
>           return false;
>         }
>       }
>     });
>   } catch (SQLException e) {
>     JDBCPersistenceAdapter.log("JDBC Failure: ", e);
>     throw IOExceptionSupport.create("Failed to recover container. Reason: " + e, e);
>   } finally {
>     c.close();
>   }
> }
> {code}
> But I am not sure if this limitation is the best way, because there will be some messages
that should be expired, but need to wait. So better solution might be to do this job in more
separated transactions.



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