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https://issues.apache.org/jira/browse/HDFS-5528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13826289#comment-13826289
]
Junping Du commented on HDFS-5528:
----------------------------------
Yes. It looks like the same issue. Let's close it with duplicated.
> NPE in instantiating MiniDFSCluster
> -----------------------------------
>
> Key: HDFS-5528
> URL: https://issues.apache.org/jira/browse/HDFS-5528
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Junping Du
> Assignee: Binglin Chang
>
> In running some tests, i.e. TestUnderReplicatedBlocks, the test can pass
> successfully, but some NPE exception is thrown out in RPC server side, like
> following:
> 2013-11-15 01:59:16,553 ERROR lib.MethodMetric
> (MethodMetric.java:snapshot(116)) - Error invoking method numOpenConnections
> java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.metrics2.lib.MethodMetric$2.snapshot(MethodMetric.java:110)
> at
> org.apache.hadoop.metrics2.lib.MethodMetric.snapshot(MethodMetric.java:141)
> at
> org.apache.hadoop.metrics2.lib.MetricsRegistry.snapshot(MetricsRegistry.java:387)
> at
> org.apache.hadoop.metrics2.lib.MetricsSourceBuilder$1.getMetrics(MetricsSourceBuilder.java:88)
> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMetrics(MetricsSourceAdapter.java:194)
> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.updateJmxCache(MetricsSourceAdapter.java:171)
> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMBeanInfo(MetricsSourceAdapter.java:150)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getNewMBeanClassName(DefaultMBeanServerInterceptor.java:321)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:307)
> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)
> at org.apache.hadoop.metrics2.util.MBeans.register(MBeans.java:58)
> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.startMBeans(MetricsSourceAdapter.java:219)
> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.start(MetricsSourceAdapter.java:95)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.registerSource(MetricsSystemImpl.java:242)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:222)
> at org.apache.hadoop.ipc.metrics.RpcMetrics.create(RpcMetrics.java:57)
> at org.apache.hadoop.ipc.Server.<init>(Server.java:2112)
> at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:901)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server.<init>(ProtobufRpcEngine.java:505)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:480)
> at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:746)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.<init>(NameNodeRpcServer.java:279)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createRpcServer(NameNode.java:512)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:492)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:688)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:673)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1267)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.createNameNode(MiniDFSCluster.java:900)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.createNameNodesAndSetConf(MiniDFSCluster.java:791)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.initMiniDFSCluster(MiniDFSCluster.java:649)
> at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:339)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster$Builder.build(MiniDFSCluster.java:320)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.TestUnderReplicatedBlocks.testSetrepIncWithUnderReplicatedBlocks(TestUnderReplicatedBlocks.java:40)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:62)
> Caused by: java.lang.NullPointerException
> at org.apache.hadoop.ipc.Server.getNumOpenConnections(Server.java:2434)
> at
> org.apache.hadoop.ipc.metrics.RpcMetrics.numOpenConnections(RpcMetrics.java:74)
> ... 46 more
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