Tao Jie created HADOOP-15121:
--------------------------------
Summary: Encounter NullPointerException when using
DecayRpcScheduler
Key: HADOOP-15121
URL: https://issues.apache.org/jira/browse/HADOOP-15121
Project: Hadoop Common
Issue Type: Bug
Reporter: Tao Jie
I set ipc.8020.scheduler.impl to org.apache.hadoop.ipc.DecayRpcScheduler, but
got excetion in namenode:
{code}
2017-12-15 15:26:34,662 ERROR impl.MetricsSourceAdapter
(MetricsSourceAdapter.java:getMetrics(202)) - Error getting metrics from source
DecayRpcSchedulerMetrics2.ipc.8020
java.lang.NullPointerException
at
org.apache.hadoop.ipc.DecayRpcScheduler$MetricsProxy.getMetrics(DecayRpcScheduler.java:781)
at
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMetrics(MetricsSourceAdapter.java:199)
at
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.updateJmxCache(MetricsSourceAdapter.java:182)
at
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMBeanInfo(MetricsSourceAdapter.java:155)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getNewMBeanClassName(DefaultMBeanServerInterceptor.java:333)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:319)
at
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
at org.apache.hadoop.metrics2.util.MBeans.register(MBeans.java:66)
at
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.startMBeans(MetricsSourceAdapter.java:222)
at
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.start(MetricsSourceAdapter.java:100)
at
org.apache.hadoop.metrics2.impl.MetricsSystemImpl.registerSource(MetricsSystemImpl.java:268)
at
org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:233)
at
org.apache.hadoop.ipc.DecayRpcScheduler$MetricsProxy.registerMetrics2Source(DecayRpcScheduler.java:709)
at
org.apache.hadoop.ipc.DecayRpcScheduler$MetricsProxy.<init>(DecayRpcScheduler.java:685)
at
org.apache.hadoop.ipc.DecayRpcScheduler$MetricsProxy.getInstance(DecayRpcScheduler.java:693)
at
org.apache.hadoop.ipc.DecayRpcScheduler.<init>(DecayRpcScheduler.java:236)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at
org.apache.hadoop.ipc.CallQueueManager.createScheduler(CallQueueManager.java:102)
at
org.apache.hadoop.ipc.CallQueueManager.<init>(CallQueueManager.java:76)
at org.apache.hadoop.ipc.Server.<init>(Server.java:2612)
at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:958)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server.<init>(ProtobufRpcEngine.java:374)
at
org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:349)
at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:800)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.<init>(NameNodeRpcServer.java:415)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.createRpcServer(NameNode.java:755)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:697)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:905)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:884)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1610)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1678)
{code}
It seems that {{metricsProxy}} in DecayRpcScheduler should initiate its
{{delegate}} field in its Initialization method
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