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nkeywal commented on HBASE-4709: -------------------------------- V2 committed. > 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, 0.96.0 > Reporter: Gary Helmling > Priority: Minor > Fix For: 0.96.0 > > Attachments: 4709.v2.patch, 4709.v2.patch, 4709_workaround.v1.patch > > > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira