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From "Jim Plush (JIRA)" <>
Subject [jira] Created: (AMQ-3034) Consumers hang when flow control is enabled - unable to proceed?
Date Fri, 12 Nov 2010 23:37:24 GMT
Consumers hang when flow control is enabled - unable to proceed?

                 Key: AMQ-3034
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.5.0
         Environment: ubuntu linux 9.10
            Reporter: Jim Plush
            Priority: Critical

I was seeing odd behavior in production and created a test case around the follow issue....

I have a producer that will attempt to enqueue 1 million messages in a while  loop. I set
the activemq.xml systemUsage settings to the following very low
to reproduce the problem. 

about 1700 messages in I hit the memory and tempUsage limits for NON_PERSISTENT messages.
My activemq log file now says: 

2010-11-12 15:25:28,777 | INFO  | Usage Manager Temp Store is Full (99% of 104857600). Stopping
producer (ID:grv-crawl04-35650-1289603606125-0:0:1:1) to prevent flooding queue://benchmarks2.
See for more info (blocking for: 722s)
| | ActiveMQ Transport: tcp:///

which is expected as I just hit flow control. On another machine I fire up a consumer to try
and dequeue messages while the producer is blocking. It's now in a state where I can't enqueue
OR dequeue as the consumer times out on the .receive(10000) command. The only thing I can
do at this point is restart the server which loses all the NON_PERSISTENT messages.

Expected Result:
Producer would hang when resources are maxed out, fire up a Consumer on another machine and
it starts to dequeue and free up space, the producer slowly starts to enqueue messages again.

Producer Code:

Consumer Code:

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