[HDFS-5528] NPE in instantiating MiniDFSCluster

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.0.0-alpha1
• Assignee: Binglin Chang
• Reporter: Junping Du
• Created: 19/Nov/13 05:43
• Updated: 12/May/16 18:13
• Resolved: 19/Nov/13 07:48

Description

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

Issue Links

• duplicates: HADOOP-10107 Server.getNumOpenConnections may throw NPE