I have run into an intermittent problem with ActiveMQ V5.9.0. The
intermittent
was tracked down to being a connection error that does not get properly
recovered.
I have recreated the problem in a very small example by creating a Camel
consumer route that retrieves messages from a JMS queue and writes the text
message to a log.
from(TEST_QUEUE).routeId(TEST_QUEUE).convertBodyTo(String.class)
.log(LoggingLevel.INFO, loggerName, "Request
Received ");
The connection string used is
failover:(tcp://serverd05.company.com:26093?keepAlive=true)?jms.prefetchPolicy.all=0
Please note that polling is being used when the prefetch size is set to 0.
I then use Hawtio on the ActiveMQ broker to add some text messages to the
queue. It works fine.
I then stop the Client Connector on the ActiveMQ broker side to simulate a
broken connection on the consumer side. (The broker must be remote to the
consumer or the error will not occur.) The client logs show that an
EOFException is caught and the connection is reestablished. The connection
also
appears on the ActiveMQ broker. it only looks good though. Sending new text
messages to the queue will not be processed. They will just sit there.
There
are no errors or warnings logged on either the consumer or broker servers.
Restarting the consumer will cause the messages to get processed. The
reconnection only intermittently fails. I find is much more like to occur if
10
minutes pass from the previous message being processed.
I turned on trace=yes in the connection string and found the root cause is
the
PullMessage commands are occasionally not being issued after a reconnect.
On
cases where it works, the log shows that the PullMessage commands do
reinstate.
I have included a log file of the failed reconnect, where the PullMessage
commands are not restarted. Simply restarting the consumer will resolve the
problem.
FailedReconnect.log
<http://activemq.2283324.n4.nabble.com/file/n4684226/FailedReconnect.log>
I am wondering if this might be a race condition, as this problem only
showed up
when the consumer was on fast servers
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