klion26 commented on issue #8895: [FLINK-12536][Runtime/Network]Make BufferOrEventSequence#getNext non blocking URL: https://github.com/apache/flink/pull/8895#issuecomment-506143844 Travis build failed seems irrelevant, have filed a [issue](https://issues.apache.org/jira/browse/FLINK-13009) to track it. ``` Test testVCoresAreSetCorrectlyAndJobManagerHostnameAreShownInWebInterfaceAndDynamicPropertiesAndYarnApplicationNameAndTaskManagerSlots(org.apache.flink.yarn.YARNSessionCapacitySchedulerITCase) failed with: java.lang.NullPointerException: java.lang.NullPointerException at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptMetrics.getAggregateAppResourceUsage(RMAppAttemptMetrics.java:128) at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.getApplicationResourceUsageReport(RMAppAttemptImpl.java:900) at org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl.createAndGetApplicationReport(RMAppImpl.java:660) at org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.getApplications(ClientRMService.java:930) at org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.getApplications(ApplicationClientProtocolPBServiceImpl.java:273) at org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:507) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:447) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989) at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:847) at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:790) 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:1836) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2486) ```
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