[
https://issues.apache.org/jira/browse/AMQ-3530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13128983#comment-13128983
]
Dominic Tootell edited comment on AMQ-3530 at 10/18/11 9:19 AM:
----------------------------------------------------------------
I noticed that the patch to FilePendingMessageCursor as attached is irrelevant;
so it can be ignored. I tested without that patch to FilePendingMessageCursor
applied, and the deadlock doesn't occur (The other two patches are required in
order to avoid the deadlock).
(FilePendingMessageCursor is irrelevant as the patch is for non deadlocking of
the <storeCursor/> when using non persistent messages to a virtual topic,
whilst restricting temp disk space. The deadlocking of <fileQueueCursor/>
still occurs with the same scenario and the applied patches; and I have no
found a valid solution to this. However, having one cursor free from deadlock
is workable for our current use of AMQ)
cheers,
/dom
was (Author: dominict):
I noticed that the patch to FilePendingMessageCursor as attached is
irrelevant; so it can be ignored. I tested without that patch to
FilePendingMessageCursor applied, and the deadlock doesn't occur (The other two
patches are required in order to avoid the deadlock).
cheers,
/dom
> Broker (5.5) Deadlock when limiting size of temp store, and using
> VirtualTopics
> -------------------------------------------------------------------------------
>
> Key: AMQ-3530
> URL: https://issues.apache.org/jira/browse/AMQ-3530
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.5.0
> Environment: 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36
> PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386
> Reporter: Dominic Tootell
> Labels: activemq, nonPersistent, storeCursor, virtualTopic
> Attachments: FilePendingMessageCursor.java,
> FilePendingMessageCursor.patch.txt, Queue.java, Queue.patch.txt,
> StoreQueueCursor.java, StoreQueueCursor.patch.txt, deadlock.tar.gz
>
>
> When using Virtual Topics and attempting to limit the Temp Table space the
> broker will dead lock.
> I have created a test case the demonstrates the above issue. The test case
> has the following scenario:
> - 1 Producer Thread (own connection) writing to VirtualTopic.FooTwo
> -- writes 10000 messages
> - 2 Consumer Threads (each own connection) consuming from
> Consumer.X.VirtualTopic.FooTwo
> -- consumes message (auto ack - but message ack for good measure - delay of
> 10ms between consumption)
> The dead lock occurs when using the either the KahaDB or ActiveMQPersistence
> persistence store is used, and seems more related to the KahaDB
> implementation used for the Temp storage area.
> I shall attach the test case (maven project), which when built (mvn clean
> package -DskipTests=true) will create an executable jar
> (target/5.5.0-deadlock-jar-with-dependencies.jar), from which the issue can
> be replicated:
> The tests can be run as follows:
> {noformat}
> java -classpath target/5.5.0-deadlock-jar-with-dependencies.jar
> bbc.forge.domt.activemq.investigation.KahaDBTempStorageDeadlockReplication55
> {noformat}
> or
> {noformat}
> java -classpath target/5.5.0-deadlock-jar-with-dependencies.jar
> bbc.forge.domt.activemq.investigation.TempStorageDeadlockReplication55
> {noformat}
> These classes are also Unit Test Cases, and output the following log files:
> - Producer logs to target/producer.log
> - Consumes log to target/consumer.log
> - A Monitor thread just run in the background that detail the number of
> messages sent and consumed... logs to target/monitor.log
> - tests write to the dir *{{target/activemq-data}}*
> The target/monitor.log can be tailed, upon which you can see the dead lock
> occur; where the consumer stops consumering and the producer stops sending;
> something like the following:
> {noformat}
> Dominic-Tootells-MacBook-Pro-2:trunk dominict$ tail -f monitor.log
> [2011.10.08 17:15:09] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):0
> [2011.10.08 17:15:09] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:0
> [2011.10.08 17:15:10] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:10] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:35
> [2011.10.08 17:15:11] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:11] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:74
> [2011.10.08 17:15:12] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:12] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:114
> [2011.10.08 17:15:13] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:13] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:152
> [2011.10.08 17:15:14] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:14] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:192
> [2011.10.08 17:15:15] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:15] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:232
> [2011.10.08 17:15:16] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:16] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:248
> [2011.10.08 17:15:17] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:17] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:248
> [2011.10.08 17:15:18] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:18] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:248
> [2011.10.08 17:15:19] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Sent(Produced):248
> [2011.10.08 17:15:19] [Thread-14] INFO MonitorConsumerAndProducedThread -
> No of Message Consumed:248
> {noformat}
> To disable limiting the temp storage add the System property
> *{{limit.temp=false}}*; and you see that the deadlock no longer occurs:
> {noformat}
> java -Dlimit.temp=false -classpath
> target/5.5.0-deadlock-jar-with-dependencies.jar
> bbc.forge.domt.activemq.investigation.KahaDBTempStorageDeadlockReplication55
> {noformat}
> ----
> The tests can be run as maven tests directly:
> {noformat}
> mvn clean test -Dtest=KahaDBTempStorageDeadlockReplication55Test
> -Dlimit.temp=true
> {noformat}
> ----
> This seems to be a different/additional issue to AMQ-2475
> ----
> The reason why this issue affects our ActiveMQ environment/installation so
> much, is that we use a shared infrastructure model. Meaning that we
> provision many activemq instances on the same physcial hardware for different
> projects/clients. We limit the disk space assigned to each broker so that no
> one application goes wild and consumes all the disk space on the hardware;
> and as a result impacts other projects/clients. Although it theory running
> more than one instance of ActiveMQ on a server might seem counter intutitive
> (with regards to performance - disk seeking); this is a business model by
> which we can get the most money out of out physical hardware and provide a
> MOM for most projects; for which maximum throughput is a secondary concern.
> Apologies that this issue is a duplicate of AMQ-3061. However, the reason
> I'm opening an additional ticket is the hope that I can actually provide you
> a patch in here (if possible) that is coded against the 5.5 apache activemq
> version. As in AMQ-3061 I accidentally:
> a) provided a faulty patch
> b) gave you a patch against a 5.4.1 version of fuse's activemq.
> Big appologies for that.
> thanks in advance, let me know if you need any more information.
> /dom
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
