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https://issues.apache.org/jira/browse/HBASE-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437596#comment-13437596
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stack commented on HBASE-4709:
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bq. In issue page someone tells it does not prevent James to come up.
Can you tell us more why the above WARN message is preventing James launching?
Maybe its not coming up for some other reason? You have more logs for us to
look at? Ask on dev list and add log there rather than here?
> Hadoop metrics2 setup in test MiniDFSClusters spewing JMX errors
> ----------------------------------------------------------------
>
> Key: HBASE-4709
> URL: https://issues.apache.org/jira/browse/HBASE-4709
> Project: HBase
> Issue Type: Bug
> Components: test
> Affects Versions: 0.92.0, 0.94.0, 0.94.1
> Reporter: Gary Helmling
> Priority: Minor
>
> Since switching over HBase to build with Hadoop 0.20.205.0, we've been
> getting a lot of metrics related errors in the log files for tests:
> {noformat}
> 2011-10-30 22:00:22,858 INFO [main] log.Slf4jLog(67): jetty-6.1.26
> 2011-10-30 22:00:22,871 INFO [main] log.Slf4jLog(67): Extract
> jar:file:/home/jenkins/.m2/repository/org/apache/hadoop/hadoop-core/0.20.205.0/hadoop-core-0.20.205.0.jar!/webapps/datanode
> to /tmp/Jetty_localhost_55751_datanode____.kw16hy/webapp
> 2011-10-30 22:00:23,048 INFO [main] log.Slf4jLog(67): Started
> SelectChannelConnector@localhost:55751
> Starting DataNode 1 with dfs.data.dir:
> /home/jenkins/jenkins-slave/workspace/HBase-TRUNK/trunk/target/test-data/7ba65a16-03ad-4624-b769-57405945ef58/dfscluster_3775fc23-1b51-4966-8133-205564bae762/dfs/data/data3,/home/jenkins/jenkins-slave/workspace/HBase-TRUNK/trunk/target/test-data/7ba65a16-03ad-4624-b769-57405945ef58/dfscluster_3775fc23-1b51-4966-8133-205564bae762/dfs/data/data4
> 2011-10-30 22:00:23,237 WARN [main] impl.MetricsSystemImpl(137): Metrics
> system not started: Cannot locate configuration: tried
> hadoop-metrics2-datanode.properties, hadoop-metrics2.properties
> 2011-10-30 22:00:23,237 WARN [main] util.MBeans(59):
> Hadoop:service=DataNode,name=MetricsSystem,sub=Control
> javax.management.InstanceAlreadyExistsException: MXBean already registered
> with name Hadoop:service=NameNode,name=MetricsSystem,sub=Control
> at
> com.sun.jmx.mbeanserver.MXBeanLookup.addReference(MXBeanLookup.java:120)
> at
> com.sun.jmx.mbeanserver.MXBeanSupport.register(MXBeanSupport.java:143)
> at
> com.sun.jmx.mbeanserver.MBeanSupport.preRegister2(MBeanSupport.java:183)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:941)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)
> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)
> at org.apache.hadoop.metrics2.util.MBeans.register(MBeans.java:56)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.initSystemMBean(MetricsSystemImpl.java:500)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.init(MetricsSystemImpl.java:140)
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.init(DefaultMetricsSystem.java:40)
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.initialize(DefaultMetricsSystem.java:50)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1483)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1459)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:417)
> at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:280)
> at
> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniDFSCluster(HBaseTestingUtility.java:349)
> at
> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:518)
> at
> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:474)
> at
> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:461)
> {noformat}
> This seems to be due to errors initializing the new hadoop metrics2 code by
> default, when running in a mini cluster. The errors themselves seem to be
> harmless -- they're not breaking any tests -- but we should figure out what
> configuration we need to eliminate them.
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