activemq-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Swapnonil Mukherjee (JIRA)" <>
Subject [jira] Created: (AMQ-3103) Active MQ stalls after Job Scheduler component shuts down.
Date Thu, 23 Dec 2010 10:44:03 GMT
Active MQ stalls after Job Scheduler component shuts down.

                 Key: AMQ-3103
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.4.2
         Environment: Redhat Enterprise Linux 5.X, 
JDK 1.5 32-bit
JDK 1.6 64-bit
Active MQ 4.2
            Reporter: Swapnonil Mukherjee

Active MQ stops accepting all incoming messages destined for a particular, queue after the
scheduler component processing scheduled messages on that queue encounters an Null Pointer

We are using the Spring JMSTemplate component to post messages onto a queue. We also place
a delay of 30 seconds on each message before posting
message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, Integer.parseInt("30") * 1000);

We use the Spring Default Message Listener Container to receive messages.

Normally the broker runs fine and we have seen messages appear under the "Scheduled" tab on
the Active MQ Console, after which they processed normally and we can tally using the "Messages
Enqueued" and  the "Messages Dequeued" numbers. But occasionally the Job Scheduler fails with
the following exception.

2010-12-10 16:31:38,522 | ERROR | JMS Failed to schedule job |
| JobScheduler:JMS
        at org.apache.kahadb.index.BTreeIndex.loadNode(
        at org.apache.kahadb.index.BTreeNode.getChild(
        at org.apache.kahadb.index.BTreeNode.remove(
        at org.apache.kahadb.index.BTreeIndex.remove(
2010-12-10 16:31:39,561 | INFO  | JobSchedulerStore:activemq-data/primary/scheduler stopped
| | JobScheduler:JMS

Why does the Job Scheduler fail? One possible reason we have found is that the clock time
settings on the VMs producing the messages and the broker as well as the consumers are all
different. So the Job Scheduler may be shutting itself down arbitrarily due to this difference
in clock. We are in the process of syncing all clocks but we are not sure whether this will
solve the problem.

But the Bug really is, even if the Job Scheduler encounters an Null Pointer, why should it
shutdown? Even more problematic is the fact that the queue itself stalls and does not accept
anymore messages after the Job Scheduler shuts down.
We have tried to delete the db.redo log to recover from this type of shutdown. The broker
recovers fine, but all messages posted to this queue after the Job Scheduler shut itself down
were lost. We have not been able to recover those messages.

I am attaching the activemq log and activemq configuration file.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message