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From "Jim Plush (JIRA)" <>
Subject [jira] Commented: (AMQ-3034) Consumers hang when flow control is enabled - unable to proceed?
Date Fri, 12 Nov 2010 23:57:25 GMT


Jim Plush commented on AMQ-3034:

more notes:
When it's in the blocking state and I stop all producers and all consumers so nothing is hitting
the broker then I go to the web admin panel and hit "delete" to remove the queue I get hit
with some errors in my activemq log file in the data dir

I cannot purge or delete this queue at this time, the browser just hangs.  http://cache07:8161/admin/queues.jsp
 (internal host)

> Consumers hang when flow control is enabled - unable to proceed?
> ----------------------------------------------------------------
>                 Key: AMQ-3034
>                 URL:
>             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
> Producer Code:
> Consumer Code:
>  Version: apache-activemq-5.5-SNAPSHOT

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