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https://issues.apache.org/jira/browse/HDFS-11041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17496465#comment-17496465
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Wei-Chiu Chuang commented on HDFS-11041:
----------------------------------------
Sure thing. Done.
> Unable to unregister FsDatasetState MBean 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
> Assignee: Wei-Chiu Chuang
> Priority: Trivial
> Fix For: 3.4.0, 2.10.2, 3.2.3, 3.3.3
>
> Attachments: HDFS-11041.01.patch, HDFS-11041.02.patch,
> HDFS-11041.03.patch
>
>
> 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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