Chris Nauroth created YARN-11360:
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Summary: Add number of decommissioning nodes to YARN cluster
metrics.
Key: YARN-11360
URL: https://issues.apache.org/jira/browse/YARN-11360
Project: Hadoop YARN
Issue Type: Improvement
Components: client, resourcemanager
Environment: YARN cluster metrics expose counts of NodeManagers in
various states including active and decommissioned. However, these metrics
don't expose NodeManagers that are currently in the process of decommissioning.
This can look a little spooky to a consumer of these metrics. First, the node
drops out of the active count, so it seems like a node just vanished. Then,
later (possibly hours later with consideration of graceful decommission), it
comes back into existence in the decommissioned count.
This issue tracks adding the decommissioning count to the metrics
ResourceManager RPC. This also enables exposing it in the {{yarn top}} output.
This metric is already visible through the REST API, so there isn't any change
required there.
Reporter: Chris Nauroth
Assignee: Chris Nauroth
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