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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6602) Redion Server Dynamic Metrics can cause high cpu usage.
Date Thu, 16 Aug 2012 23:17:37 GMT
Elliott Clark created HBASE-6602:
------------------------------------

             Summary: Redion Server Dynamic Metrics can cause high cpu usage.
                 Key: HBASE-6602
                 URL: https://issues.apache.org/jira/browse/HBASE-6602
             Project: HBase
          Issue Type: Bug
            Reporter: Elliott Clark


When regions are getting added and removed lots of cpu time can be used by jmx.  This is caused
by sending jmx messages for every new metric that is added or removed.

Seeing jstacks like this:

"RMI TCP Connection(3)-10.4.19.33" daemon prio=10 tid=0x00007f9d64b1d000 nid=0x353 runnable
[0x00007f9d598d6000]
   java.lang.Thread.State: RUNNABLE
	at java.util.HashMap.put(HashMap.java:374)
	at org.apache.hadoop.metrics.util.MetricsDynamicMBeanBase.createMBeanInfo(MetricsDynamicMBeanBase.java:103)
	at org.apache.hadoop.metrics.util.MetricsDynamicMBeanBase.updateMbeanInfoIfMetricsListChanged(MetricsDynamicMBeanBase.java:75)
	at org.apache.hadoop.metrics.util.MetricsDynamicMBeanBase.getAttribute(MetricsDynamicMBeanBase.java:133)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)
	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1404)
--
	at java.util.TimerThread.run(Timer.java:462)

"Timer thread for monitoring hbase" daemon prio=10 tid=0x00007f9d648fe000 nid=0x2b5 runnable
[0x00007f9d624c7000]
   java.lang.Thread.State: RUNNABLE
	at java.util.HashMap.put(HashMap.java:374)
	at org.apache.hadoop.metrics.util.MetricsDynamicMBeanBase.createMBeanInfo(MetricsDynamicMBeanBase.java:103)
	at org.apache.hadoop.metrics.util.MetricsDynamicMBeanBase.updateMbeanInfoIfMetricsListChanged(MetricsDynamicMBeanBase.java:75)
	at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.hbase.regionserver.metrics.RegionServerDynamicMetrics.setNumericMetric(RegionServerDynamicMetrics.java:105)

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