Andrew Wang created HDFS-5524: --------------------------------- Summary: NPE during Namenode startup in Server#getNumConnections Key: HDFS-5524 URL: https://issues.apache.org/jira/browse/HDFS-5524 Project: Hadoop HDFS Issue Type: Bug Components: namenode Affects Versions: 3.0.0 Reporter: Andrew Wang Priority: Minor
Saw this stacktrace while starting up a trunk namenode, maybe a race between starting the RPC server and the metrics system? {code} 13/11/18 14:49:32 ERROR lib.MethodMetric: Error invoking method numOpenConnections java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) 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$1.getMetrics(MetricsSourceBuilder.java:88) at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMetrics(MetricsSourceAdapter.java:194) at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.updateJmxCache(MetricsSourceAdapter.java:171) at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMBeanInfo(MetricsSourceAdapter.java:150) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getNewMBeanClassName(DefaultMBeanServerInterceptor.java:333) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:319) at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522) at org.apache.hadoop.metrics2.util.MBeans.register(MBeans.java:58) at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.startMBeans(MetricsSourceAdapter.java:219) at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.start(MetricsSourceAdapter.java:95) at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.registerSource(MetricsSystemImpl.java:242) at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:222) at org.apache.hadoop.ipc.metrics.RpcMetrics.create(RpcMetrics.java:57) at org.apache.hadoop.ipc.Server.<init>(Server.java:2112) at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:902) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server.<init>(ProtobufRpcEngine.java:507) at org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:480) at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:746) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.<init>(NameNodeRpcServer.java:288) 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:1271) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1337) 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) ... 32 more {code} -- This message was sent by Atlassian JIRA (v6.1#6144)