Bibin A Chundatt created YARN-9640:
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Summary: Slow event processing could cause too many attempt
unregister events
Key: YARN-9640
URL: https://issues.apache.org/jira/browse/YARN-9640
Project: Hadoop YARN
Issue Type: Bug
Reporter: Bibin A Chundatt
We found in one of our test cluster verification that the number attempt
unregister events is about 300k+.
# AM all containers completed.
# AMRMClientImpl send finishApplcationMaster
# AMRMClient check event 100ms the finish Status using finishApplicationMaster
request.
# AMRMClientImpl#unregisterApplicationMaster
{code:java}
while (true) {
FinishApplicationMasterResponse response =
rmClient.finishApplicationMaster(request);
if (response.getIsUnregistered()) {
break;
}
LOG.info("Waiting for application to be successfully unregistered.");
Thread.sleep(100);
}
{code}
# ApplicationMasterService finishApplicationMaster interface sends unregister
events on every status update.
We should send unregister event only once and cache event send , ignore and
send not unregistered response back to AM not overloading the event queue.
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