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https://issues.apache.org/jira/browse/YARN-7007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17012529#comment-17012529
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Yang Wang commented on YARN-7007:
---------------------------------
[~cheersyang] [~Tao Yang] We come across the same problem in FLINK-15534 and i
think many users are using Flink with bundled hadoop-2.8.x. It will be very
good if we could backport this fix to 2.8 and release in 2.8.6. Could you help
with this?
> NPE in RM while using YarnClient.getApplications()
> --------------------------------------------------
>
> Key: YARN-7007
> URL: https://issues.apache.org/jira/browse/YARN-7007
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.7.2
> Reporter: Lingfeng Su
> Assignee: Lingfeng Su
> Priority: Major
> Labels: patch
> Fix For: 2.9.0, 3.0.0-beta1
>
> Attachments: YARN-7007.001.patch
>
>
> {code:java}
> java.lang.NullPointerException: java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptMetrics.getAggregateAppResourceUsage(RMAppAttemptMetrics.java:118)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.getApplicationResourceUsageReport(RMAppAttemptImpl.java:857)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl.createAndGetApplicationReport(RMAppImpl.java:629)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.verifyAndCreateAppReport(ClientRMService.java:972)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.getApplications(ClientRMService.java:898)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.getApplications(ClientRMService.java:734)
> at
> org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.getApplications(ApplicationClientProtocolPBServiceImpl.java:239)
> at
> org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:441)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:973)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2202)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2198)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1738)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2196)
> 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.yarn.ipc.RPCUtil.instantiateException(RPCUtil.java:53)
> at
> org.apache.hadoop.yarn.ipc.RPCUtil.instantiateRuntimeException(RPCUtil.java:85)
> at
> org.apache.hadoop.yarn.ipc.RPCUtil.unwrapAndThrowException(RPCUtil.java:122)
> at
> org.apache.hadoop.yarn.api.impl.pb.client.ApplicationClientProtocolPBClientImpl.getApplications(ApplicationClientProtocolPBClientImpl.java:254)
> at sun.reflect.GeneratedMethodAccessor731.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
> at com.sun.proxy.$Proxy161.getApplications(Unknown Source)
> at
> org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.getApplications(YarnClientImpl.java:479)
> at
> org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.getApplications(YarnClientImpl.java:456)
> {code}
> When I use YarnClient.getApplications() to get all applications of RM,
> Occasionally, it throw a NPE problem.
> {code:java}
> RMAppAttempt currentAttempt = rmContext.getRMApps()
> .get(attemptId.getApplicationId()).getCurrentAppAttempt();
> {code}
> if the application id is not in ConcurrentMap<ApplicationId, RMApp>
> getRMApps(), it may throw NPE problem.
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