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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6602) Region Server Dynamic Metrics can cause high cpu usage.
Date Fri, 17 Aug 2012 00:15:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436457#comment-13436457
] 

stack commented on HBASE-6602:
------------------------------

+1

I asked Elliott if flag needs to be a data member rather than local variable and he thought
about having methods return true/false if needs update... but turns out the interaction w/
clear requires that it be a data member.

needsUpdateMessage seems fine to me.
                
> Region 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
>         Attachments: HBASE-6602-0.94-0.patch
>
>
> 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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