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From Tim Bain <tb...@alumni.duke.edu>
Subject Re: confused about Usage Manager Memory Limit reached
Date Tue, 09 Dec 2014 01:57:51 GMT
The log line tells you how you're doing against two different limits: the
per-destination limit and the entire-broker limit.  The per-destination
limit is first, and the log line says you're using 0% of what you've
allocated per destination, so you're right that you're fine there.  The
full-broker limit is second, and the log line says you're using 104% of the
available memory, which is why you're getting flow controlled: although the
individual destination is empty, the broker as a whole is full, and this
one message just happens to be the straw that breaks the camel's back.  So
figure out what other destination has lots of messages (or large messages)
to be using 70GB(!) of memory...

On Mon, Dec 8, 2014 at 6:46 PM, brian <brian.ally@conceptual.ca> wrote:

> Using ActiveMQ 5.9.1
>
> Our setup: A Spring/JMS producer places many (sometimes quite large)
> messages on one queue (hf.request), which are being picked up by a PHP
> Stomp client. PHP processes the data and sends a message to a second queue
> (hf.response) to let it know how things went.
>
> Occasionally, we're seeing the PHP producer being blocked.
>
> Starting with both IDs known ...
>
> php (stomp): ID:pan-51744-1418069977147-2:2
> tcp://127.0.0.1:34916
>
> java (openwire): ID:pan-36709-1418086070781-1:1
> tcp://127.0.0.1:46827
>
>
> 2014-12-08 20:17:26,535 | INFO  | Usage(default:memory:queue://hf.response:memory)
> percentUsage=0%, usage=0, limit=720791142, percentUsageMinDelta=1%;Parent:Usage(default:memory)
> percentUsage=104%, usage=752535801, limit=720791142,
> percentUsageMinDelta=1%: Usage Manager Memory Limit reached. Producer
> (ID:pan-51744-1418069977147-2:2:-1:1) stopped to prevent flooding
> queue://hf.response. See http://activemq.apache.org/
> producer-flow-control.html for more info (blocking for: 1352s) |
> org.apache.activemq.broker.region.Queue | ActiveMQ Transport:
> tcp:///127.0.0.1:34916@61613
>
>
> The log message is confusing as it appears to be telling me that the
> response queue is being flooded. However, the amount of data sent to
> response is trivial:
>
> 2014-12-08 19:55:01 Info: Array
> (
>     [synchronizationId] => 6676ab36-f6cf-402d-9045-b58e210fcd3e
>     [type] => INVENTORY_ITEM
>     [command] => CREATE
>     [status] => OK
>     [statusMessage] =>
> )
>
>
> ... compared to request, which can amount to several MB per msg. And it
> can't possibly be that PHP is hitting the queue too fast as it has a fair
> bit of data to process before it sends to hf.response.
>
> The browser client shows that all messages enqueued to response have been
> successfully dequeued, but there are several hundred pending in hf.request.
>
> Can anyone tell me what might be going on here? If anything, i'd expect
> the java producer to be blocked to prevent hf.request from being flooded.
> That is, i would have thought that the place where we'd run into trouble
> would be constantPendingMessageLimitStrategy. Here's the config for that:
>
> <pendingMessageLimitStrategy>
>   <constantPendingMessageLimitStrategy limit="1000"/>
> </pendingMessageLimitStrategy>
>
> System usage is:
>
> <systemUsage>
>   <systemUsage>
>       <memoryUsage>
>           <memoryUsage percentOfJvmHeap="70" />
>       </memoryUsage>
>       <storeUsage>
>           <storeUsage limit="100 gb"/>
>       </storeUsage>
>       <tempUsage>
>           <tempUsage limit="50 gb"/>
>       </tempUsage>
>   </systemUsage>
> </systemUsage>
>
>
> The only thing i can think of is that the log message, "stopped to prevent
> flooding queue://hahnfarms.response" is getting its queue name from the
> hf.request messages' reply-to headers, but that the real problem is with
> hf.request. But then, i'd presume that it would be the java client that
> would be blocked.
>
>
>

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