Hadoop metrics2 setup in test MiniDFSClusters spewing JMX errors
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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
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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