HBase
  1. HBase
  2. HBASE-4709

Hadoop metrics2 setup in test MiniDFSClusters spewing JMX errors

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Minor Minor
    • Resolution: Fixed
    • Affects Version/s: 0.90.4, 0.92.0, 0.94.0, 0.94.1, 0.95.2
    • Fix Version/s: 0.95.0
    • Component/s: test
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      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:

      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)
      

      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.

      1. 4709_workaround.v1.patch
        1 kB
        Nicolas Liochon
      2. 4709.v2.patch
        2 kB
        Nicolas Liochon
      3. 4709.v2.patch
        2 kB
        Nicolas Liochon

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            • Assignee:
              Unassigned
              Reporter:
              Gary Helmling
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              Dates

              • Created:
                Updated:
                Resolved:

                Development