Zac Zhou created YARN-9721:
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Summary: An easy method to exclude a nodemanager from the yarn
cluster cleanly
Key: YARN-9721
URL: https://issues.apache.org/jira/browse/YARN-9721
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Zac Zhou
Attachments: decommission nodes.png
If we want to take offline a nodemanager server, nodes.exclude-path
and "rmadmin -refreshNodes" command are used to decommission the server.
But this method cannot clean up the node clearly. Nodemanager servers are still
in Decommissioned Nodes as the attachment shows.
[YARN-4311|https://issues.apache.org/jira/browse/YARN-4311] enable a
removalTimer to clean up the untracked node.
But the logic of isUntrackedNode method is to restrict. If include-path is not
used, no servers can meet the criteria. Using an include file would make a
potential risk in maintenance.
If yarn cluster is installed on cloud, nodemanager servers are created and
deleted frequently. We need a way to exclude a nodemanager from the yarn
cluster cleanly. Otherwise, the map of rmContext.getInactiveRMNodes() would
keep growing, which would cause a memory issue of RM.
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