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https://issues.apache.org/jira/browse/HBASE-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504028#comment-13504028
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Elliott Clark commented on HBASE-4709:
--------------------------------------
Should the static logger definitions be moved into hbase-hadoop{1|2}-compat?
Though right now it works because hadoop 1 and 2 both happen to have that class
in the same location.
> 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
> Fix For: 0.96.0
>
> Attachments: 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.
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