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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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