kyungwan nam created YARN-10184:
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Summary: NPE happens in NMClient when reinitializeContainer
Key: YARN-10184
URL: https://issues.apache.org/jira/browse/YARN-10184
Project: Hadoop YARN
Issue Type: Bug
Reporter: kyungwan nam
Assignee: kyungwan nam
NPE happens in NMClient when upgrading a yarn-service app which AM has been
restarted.
Here is AM’s log at the time of the NPE.
{code}
2020-02-20 16:43:35,962 [Container Event Dispatcher] ERROR
yarn.YarnUncaughtExceptionHandler - Thread Thread[Container Event
Dispatcher,5,main] threw an Exception.
java.lang.NullPointerException
at
org.apache.hadoop.yarn.client.api.async.impl.NMClientAsyncImpl$1.run(NMClientAsyncImpl.java:172)
2020-02-20 16:43:36,398 [AMRM Callback Handler Thread] WARN
service.ServiceScheduler - Container container_e58_1581930783345_1954_01_000006
Completed. No component instance exists. exitStatus=-100. diagnostics=Container
released by application
{code}
NMClient keeps containers since the container has been started.
But, when restarting AM, NMClient is initialized and previous containers are
lost.
Since then, NPE will happen when reinitializeContainer is requested.
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