[ZEPPELIN-4569] Zeppelin Ipython interpreter is not closing properly.

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.8.2
• Component/s: zeppelin-interpreter

Environment

JDK 1.8.0

Apache Zeppelin 0.8.2

• Assignee: Unassigned
• Reporter: Loghi Perinpanayagam
• Created: 18/Jan/20 13:04
• Updated: 18/Aug/20 09:26

Description

io.grpc.internal.SerializingExecutor run
SEVERE: Exception while executing runnable io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable@619fd7d
java.lang.NullPointerException
 at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onClose(ClientCalls.java:434)
 at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
 at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
 at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
 at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:678)
 at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
 at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
 at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
 at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:403)
 at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:459)
 at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:63)
 at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:546)
 at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:467)
 at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInContext(ClientCallImpl.java:531)
 at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
 at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
 at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
 at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
 at java.base/java.lang.Thread.run(Thread.java:834)

The problem must be in io.grpc. Could anyone help?