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From "Kevin Yaussy (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1202) 4.2 Broker memory leak wrt network connectors
Date Mon, 12 Mar 2007 17:54:34 GMT
4.2 Broker memory leak wrt network connectors
---------------------------------------------

                 Key: AMQ-1202
                 URL: https://issues.apache.org/activemq/browse/AMQ-1202
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 4.2.0
            Reporter: Kevin Yaussy
             Fix For: 4.2.0
         Attachments: jmap.tar

If the NetworkConnector list contains any entries to unavailable / unreachable targets, memory
is leaked.

Tested with a broker having fairly "stock" settings, and with the following NetworkConnector
section:
    <networkConnectors>
      <networkConnector uri="static://(tcp://dummy:5111?connectionTimeout=5000)" prefetchSize="10000"/>
    </networkConnectors>

I am using JDK 1.6, since that version of jmap allows the "-histo:live" switch, producing
a list of the live objects.

Just after starting the Broker, here is the top 10 entries from jmap:
num   #instances    #bytes  class name
--------------------------------------
  1:     36639     4143792  <constMethodKlass>
  2:     36639     2935200  <methodKlass>
  3:     54423     2326752  <symbolKlass>
  4:      8099     2008984  [B
  5:      3451     1771816  <constantPoolKlass>
  6:      3451     1433032  <instanceKlassKlass>
  7:     14220     1212160  [C
  8:      2894     1089840  <constantPoolCacheKlass>
  9:         8      524352  [Lorg.apache.activemq.command.DataStructure;


And then after about 5 minutes or so, here's the jmap top 10:
num   #instances    #bytes  class name
--------------------------------------
  1:       198    12977712  [Lorg.apache.activemq.command.DataStructure;
  2:     36647     4144520  <constMethodKlass>
  3:     36647     2935840  <methodKlass>
  4:     54427     2326960  <symbolKlass>
  5:      8293     2207032  [B
  6:      3455     1773488  <constantPoolKlass>
  7:      3455     1434376  <instanceKlassKlass>
  8:     14499     1234040  [C
  9:      2898     1091120  <constantPoolCacheKlass>
 10:     17754      426096  java.lang.String


Not sure what component down the list is holding onto DataStructure, but I've included the
full jmap output files.


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