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Date: Tue, 4 Sep 2012 17:15:07 +1100 (NCT)
From: "Lionel Cons (JIRA)" <jira@apache.org>
To: commits@activemq.apache.org
Message-ID: <2076889276.31615.1346739307605.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (APLO-257) Better memory usage (avoid Java OOM
 exceptions)
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Lionel Cons created APLO-257:
--------------------------------

             Summary: 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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