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From "Brook, James" <jbr...@upcbroadband.com>
Subject Re: Producer blocks when trying to send async JMS messages to failed broker
Date Tue, 17 Apr 2012 10:41:10 GMT
Thanks Gary. I am still not completely sure I get it. I am using failover because I *do* want
my client to reconnect when the broker comes back up. However, when it's down I don't want
to queue messages or block anything - they can be thrown away. My messages really are 'fire
and forget'. These lose their meaning if not delivered to their ultimate destination within
2 seconds or so.

My expectation was that I would be able to asynchronously send messages and never block. I
have tried using non-persistent messages, and telling the transport not to track messages.

If I do what you suggest won't the failover transport wait 10ms, try to reconnect once and
then give up forever? Wouldn't that mean someone has to take manual action to reestablish
the connection?

Sorry if I am missing the point. 

On Apr 17, 2012, at 12:32 PM, Gary Tully wrote:

> configure the failover maxReconnectAttempts and the failure to connect
> will bubble up to the application where you can ignore it.
> The assumption of failover is that you want to 'transparently'
> maintain the connection and block pending reconnect
> 
> failover:(...)? maxReconnectAttempts=1
> 
> http://activemq.apache.org/failover-transport-reference.html
> 
> On 16 April 2012 19:52, Brook, James <jbrook@upcbroadband.com> wrote:
>> I am trying to make sure my application is resilient. It sends JMS messages to a
remote ActiveMQ broker. Unfortunately when that broker goes down the client starts to block
even though I am using the Camel asyncSendBody method. See below for the stack trace.
>> 
>> The ActiveMQ version is 5.3.0 although I have the same problem with the most recent
stable release.
>> 
>> This is the argument I give to the asyncSendBody method:
>> 
>>    jms:queue:myQueue?jmsMessageType=Text&timeToLive=5000
>> 
>> My connection factory uses this URL:
>> 
>>    failover:(tcp://my.ip:61613,tcp://my:ip:61613)?useExponentialBackOff=true&randomize=false&timeout=1000
>> 
>> As the broker starts to fail I see lots of the following errors in the log:
>> 
>>    org.apache.camel.processor.UnitOfWorkProcessor  - Caught unhandled exception while
processing ExchangeId: ID-james-upcit-ds-upc-biz-64404-1334601186430-0-38
>> IOException: Failover timeout of 1000 ms reached
>> 
>>   org.apache.activemq.transport.failover.FailoverTransport  - Failover timed out
after 29998ms
>> 
>> Then after attempting to send quite a few more messages the blocking starts. I can't
go live with my application in this state and I really don't want to put another queue in
place to decouple the JMS producer. Is there something I am doing wrong? If the broker is
down I am quite happy for these messages to be lost - they lose their meaning if not delivered
immediately.
>> 
>> Thanks
>> James
>> 
>> at java.lang.Object.wait(Native Method)
>>        at org.apache.activemq.transport.failover.FailoverTransport.oneway(FailoverTransport.java:433)
>>        at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:40)
>>        at org.apache.activemq.transport.ResponseCorrelator.asyncRequest(ResponseCorrelator.java:74)
>>        at org.apache.activemq.transport.ResponseCorrelator.request(ResponseCorrelator.java:79)
>>        at org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnection.java:1244)
>>        at org.apache.activemq.ActiveMQConnection.ensureConnectionInfoSent(ActiveMQConnection.java:1350)
>>        at org.apache.activemq.ActiveMQConnection.createSession(ActiveMQConnection.java:300)
>>        at org.springframework.jms.support.JmsAccessor.createSession(JmsAccessor.java:196)
>>        at org.springframework.jms.core.JmsTemplate.execute(JmsTemplate.java:457)
>>        at org.apache.camel.component.jms.JmsConfiguration$CamelJmsTemplate.send(JmsConfiguration.java:185)
>>        at org.apache.camel.component.jms.JmsProducer.doSend(JmsProducer.java:359)
>>        at org.apache.camel.component.jms.JmsProducer.processInOnly(JmsProducer.java:313)
>>        at org.apache.camel.component.jms.JmsProducer.process(JmsProducer.java:111)
>>        at org.apache.camel.processor.UnitOfWorkProcessor.processAsync(UnitOfWorkProcessor.java:150)
>>        at org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:117)
>>        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:99)
>>        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:86)
>>        at org.apache.camel.processor.UnitOfWorkProducer.process(UnitOfWorkProducer.java:63)
>>        at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:352)
>>        at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:324)
>>        at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:223)
>>        at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:324)
>>        at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:169)
>>        at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:111)
>>        at org.apache.camel.impl.DefaultProducerTemplate.sendBody(DefaultProducerTemplate.java:124)
>>        at org.apache.camel.impl.DefaultProducerTemplate$14.call(DefaultProducerTemplate.java:596)
>>        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>>        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>>        at java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy.rejectedExecution(ThreadPoolExecutor.java:1746)
>>        at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:767)
>>        at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:658)
>>        at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:92)
>>        at org.apache.camel.impl.DefaultProducerTemplate.asyncSendBody(DefaultProducerTemplate.java:601)
>>        at org.apache.camel.impl.DefaultProducerTemplate.asyncSendBody(DefaultProducerTemplate.java:458)
> 
> 
> 
> -- 
> http://fusesource.com
> http://blog.garytully.com


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