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https://issues.apache.org/jira/browse/HADOOP-15121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308633#comment-16308633
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Ajay Kumar edited comment on HADOOP-15121 at 1/2/18 11:13 PM:
--------------------------------------------------------------
[~Tao Jie] thanks for updating the patch. While testing the patch in my local
machine it timed out occasionally. We can increase the timeout to 4000 or 6000
to be on safer side. Also, i think we can simply the test case a little bit by
getting rid of catch block. Any exception will result in failure and stacktrace
will be visible in logs.
was (Author: ajayydv):
[~Tao Jie] thanks for updating the patch. While testing the patch in my local
machine it timed out occasionally. I think we can increase the timeout to 4000
or 6000 to be on safer side. Also, i think we can simply the test case a
little bit by getting rid of catch block. Any exception will result in failure
and stacktrace will be visible in logs.
> Encounter NullPointerException when using DecayRpcScheduler
> -----------------------------------------------------------
>
> Key: HADOOP-15121
> URL: https://issues.apache.org/jira/browse/HADOOP-15121
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.8.2
> Reporter: Tao Jie
> Attachments: HADOOP-15121.001.patch, HADOOP-15121.002.patch,
> HADOOP-15121.003.patch
>
>
> 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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