[ https://issues.apache.org/jira/browse/HDFS-5528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13826279#comment-13826279 ]
Jing Zhao commented on HDFS-5528: --------------------------------- Still, this is duplicate of HADOOP-10107 :-) ? > 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 -- This message was sent by Atlassian JIRA (v6.1#6144)