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https://issues.apache.org/jira/browse/HDFS-11041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15595733#comment-15595733
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Xiaoyu Yao commented on HDFS-11041:
-----------------------------------
[~jojochuang], thanks for reporting this and post the fix. The fix looks good
to me.
Can you elaborate on how this issue is repro? Is it an existing unit test or
corer cases from a real cluster?
> 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
> Assignee: Wei-Chiu Chuang
> Priority: Trivial
> Attachments: HDFS-11041.01.patch, HDFS-11041.02.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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