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https://issues.apache.org/jira/browse/YARN-4898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223691#comment-15223691
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Rohith Sharma K S commented on YARN-4898:
-----------------------------------------
Couple of things observing from code is
# RMNodelableManager service is started even though node label is not
configured. I am not sure why it was done.
# About the impact, not much major but we can optimize it so that
AsyncDispatcher load can be reduced.
cc :/ [~leftnoteasy] [~Naganarasimha]
> Avoid sending NODE_LABELS_UPDATE event to scheduler when node label is not
> configured
> -------------------------------------------------------------------------------------
>
> Key: YARN-4898
> URL: https://issues.apache.org/jira/browse/YARN-4898
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Reporter: Rohith Sharma K S
>
> It is observed that when ever new NodeManager is registered or expired with
> ResourceManager, a new additional event NODE_LABELS_UPDATE has been triggered
> even though *Node Label is not enabled*. This makes dispatcher to process one
> event without any real use.
> logs : where all 100 of node-labels-update events processed by dispatcher.
> {noformat}
> 2016-03-30 15:42:24,461 DEBUG [AsyncDispatcher event handler]
> event.AsyncDispatcher (AsyncDispatcher.java:dispatch(175)) - Dispatching the
> event
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeLabelsUpdateSchedulerEvent.EventType:
> NODE_LABELS_UPDATE
> 2016-03-30 15:42:24,461 DEBUG [AsyncDispatcher event handler]
> event.AsyncDispatcher (AsyncDispatcher.java:dispatch(175)) - Dispatching the
> event
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeLabelsUpdateSchedulerEvent.EventType:
> NODE_LABELS_UPDATE
> 2016-03-30 15:42:24,462 DEBUG [AsyncDispatcher event handler]
> event.AsyncDispatcher (AsyncDispatcher.java:dispatch(175)) - Dispatching the
> event
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeLabelsUpdateSchedulerEvent.EventType:
> NODE_LABELS_UPDATE
> 2016-03-30 15:42:24,462 DEBUG [AsyncDispatcher event handler]
> event.AsyncDispatcher (AsyncDispatcher.java:dispatch(175)) - Dispatching the
> event
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeLabelsUpdateSchedulerEvent.EventType:
> NODE_LABELS_UPDATE
> {noformat}
> Point of concern is In large cluster, it is seen that registering thousands
> of nodes altogether to running cluster might/would cause other events
> processing to get delayed.
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