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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11041) Unable to unregister FsDatasetState MBean if if DataNode is shutdown twice
Date Fri, 21 Oct 2016 11:26:59 GMT
Wei-Chiu Chuang created HDFS-11041:
--------------------------------------

             Summary: Unable to unregister FsDatasetState MBean if if DataNode is shutdown
twice
                 Key: HDFS-11041
                 URL: https://issues.apache.org/jira/browse/HDFS-11041
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
            Reporter: Wei-Chiu Chuang
            Priority: Trivial


I saw error message like the following in some tests
{noformat}
2016-10-21 04:09:03,900 [main] WARN  util.MBeans (MBeans.java:unregister(114)) - Error unregistering
Hadoop:service=DataNode,name=FSDatasetState-33cd714c-0b1a-471f-8efe-f431d7d874bc
javax.management.InstanceNotFoundException: Hadoop:service=DataNode,name=FSDatasetState-33cd714c-0b1a-471f-8efe-f431d7d874bc
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1095)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.exclusiveUnregisterMBean(DefaultMBeanServerInterceptor.java:427)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(DefaultMBeanServerInterceptor.java:415)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(JmxMBeanServer.java:546)
	at org.apache.hadoop.metrics2.util.MBeans.unregister(MBeans.java:112)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.shutdown(FsDatasetImpl.java:2127)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.shutdown(DataNode.java:2016)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdownDataNodes(MiniDFSCluster.java:1985)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1962)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1936)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1929)
	at org.apache.hadoop.hdfs.TestDatanodeReport.testDatanodeReport(TestDatanodeReport.java:144)
{noformat}

The test shuts down datanode, and then shutdown cluster, which shuts down the a datanode twice.
Resetting the FsDatasetSpi reference in DataNode to null resolves the issue.



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