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From "Marco Buss (JIRA)" <>
Subject [jira] Commented: (AMQ-1557) High message frequency causes ActiveMQ to freeze
Date Mon, 21 Jan 2008 12:14:04 GMT


Marco Buss commented on AMQ-1557:

I can see the same with topics async send and producer flow control. The persistence store
was derby and mysql. 
I used 3 Topics with 9 diferent subscribers for each topic. 5 of this subscribers were slow
(they pause for 60 seconds after every message). All looks fine as long as the topic reaches
1000 Messages. Then the cpu amount used increse to 90% and no message can be delivered, but
the Consumers already get the Messages.

> High message frequency causes ActiveMQ to freeze
> ------------------------------------------------
>                 Key: AMQ-1557
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.0.0, 5.1.0
>         Environment: observed on Windows XP Professional SP2, Sun JDK 1.5.01_11, but
probably affects all platforms
>            Reporter: J├╝rgen Schumacher
>         Attachments:
> ActiveMQ freezes in a test setup with very high message frequency of persistent messages
and multiple producers and consumers running on multiple machines:
> - Host 1: Multiple Producers send messages very fast to queue1 
> - Host 2: Multiple Processors consume message from queue1 and send a new message for
each consumed message to queue2, also very fast.
> - Host 3: ActiveMQ server and 1 consumer reads messages from queue2.
> With producerFlowControl enabled, the system freezes very soon (a bit more than 1000
> With producerFlowControl disabled, it seems to run longer at first, but it still freezes
> Using transactions or not does not seem to make a difference.
> See this thread in user mailing list for more details:
> See attachment for code of test cases and the batch files to start them.

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