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From "Lionel Cons (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APLO-257) Better memory usage (avoid Java OOM exceptions)
Date Tue, 04 Sep 2012 06:19:07 GMT

    [ https://issues.apache.org/jira/browse/APLO-257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447506#comment-13447506
] 

Lionel Cons commented on APLO-257:
----------------------------------

FWIW, the stomp-benchmark scenario file used is the one attached to  APLO-176. So only "reasonable"
stress, without huge messages or a very high number of concurrent connections.

Also, the apollo.xml file contains default settings except slow_consumer_policy="queue" for
topics, which should not impact memory usage too much since pending messages should be sent
to queue so they should eventually be swapped out to disk.
                
> Better memory usage (avoid Java OOM exceptions)
> -----------------------------------------------
>
>                 Key: APLO-257
>                 URL: https://issues.apache.org/jira/browse/APLO-257
>             Project: ActiveMQ Apollo
>          Issue Type: Improvement
>         Environment: apollo-99-trunk-20120902.143447-110
>            Reporter: Lionel Cons
>
> When running a stomp-benchmark based stress test against Apollo, it generated several
OOM exceptions like:
> 2012-09-03 23:51:45,275 | WARN  | handle failed | 
> java.lang.OutOfMemoryError: Java heap space
> 2012-09-03 23:52:02,428 | WARN  |  | 
> java.lang.OutOfMemoryError: Java heap space
> 2012-09-03 23:52:01,372 | WARN  | Error for /broker | 
> java.lang.OutOfMemoryError: Java heap space
> 2012-09-03 23:51:55,554 | WARN  | Problem scavenging sessions | 
> java.lang.OutOfMemoryError: Java heap space
> The JVM already had 8GB of heap. FWIW, here are the options used: "-server -Xmx8192m
-Xms4096m -XX:-UseBiasedLocking".
> Would it be possible for Apollo to detect when its getting close to the JVM limits and
adjust its memory usage accordingly (reducing buffers, swapping messages to disk...)?

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