Simbarashe Dzinamarira created HDFS-16040:
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Summary: RpcQueueTime metric counts requeued calls as unique
events.
Key: HDFS-16040
URL: https://issues.apache.org/jira/browse/HDFS-16040
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 3.3.0, 2.10.0
Reporter: Simbarashe Dzinamarira
Assignee: Simbarashe Dzinamarira
The RpcQueueTime metric is updated every time a call is re-queued while waiting
for the server state to reach the call's client's state ID. This is in contrast
to RpcProcessingTime which is only updated when the call if finally processed.
On the Observer NameNode this can result in RpcQueueTimeNumOps being much
larger than RpcProcessingTimeNumOps. The re-queueing is an internal
optimization to avoid blocking and shouldn't result in an inflated metric.
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