[jira] [Created] (YARN-11360) Add number of decommissioning nodes to YARN cluster metrics.

["Chris Nauroth (Jira)" <ji...@apache.org>]

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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