[jira] [Resolved] (HDFS-5524) NPE during Namenode startup in Server#getNumConnections

["Andrew Wang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-5524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang resolved HDFS-5524.
-------------------------------

    Resolution: Duplicate

Good call, it's a dupe. Thanks Jing.

> 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}



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