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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "ZooKeeper/Troubleshooting" by PatrickHunt
Date Fri, 02 Apr 2010 04:58:48 GMT
Dear Wiki user,

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The "ZooKeeper/Troubleshooting" page has been changed by PatrickHunt.


  The Java GC can cause [[https://issues.apache.org/jira/browse/HBASE-1316|starvation of the
Java threads]] in the VM. This manifests itself as client disconnects and session expirations
due to starvation of the heartbeat thread. The GC runs, locking out all Java threads from
+ You can get an idea of what's happening wrt GC in your client/server VMs by using the following
options when starting the JVM:
+ -Xloggc:gc.log -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCApplicationConcurrentTime
-XX:+PrintGC -XX:+PrintGCTimeStamps -XX:+PrintGCDetails
+ Additionally you can use 'jstat' on a running jvm to gain more insight into realtime GC
activity, see: http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jstat.html
  This issue can be resolved in a few ways:
  First look at using one of the alternative GCs, in particular [[http://developer.amd.com/documentation/articles/pages/4EasyWaystodoJavaGarbageCollectionTuning.aspx|low
latency GC]]:

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