Mike Percy created KUDU-1506:
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Summary: Add Consensus "follower lag" metrics
Key: KUDU-1506
URL: https://issues.apache.org/jira/browse/KUDU-1506
Project: Kudu
Issue Type: New Feature
Components: consensus, metrics
Affects Versions: 0.9.0
Reporter: Mike Percy
It would be useful to have metrics that measured the lag time between leader
WAL writes and follower WAL writes. Imagine if a node on a cluster had a very
slow disk or was extremely overloaded. That node may constantly be falling
behind and/or remote bootstrapping. It would help to be able to monitor for
nodes that were constantly very far behind the leader (high seconds or minutes)
so that administrators could take a look at these slow machines and either
remove them from the cluster or fix the underlying issues.
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