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Posted to issues@kudu.apache.org by "Mike Percy (JIRA)" <ji...@apache.org> on 2016/06/24 23:04:16 UTC

[jira] [Created] (KUDU-1506) Add Consensus "follower lag" metrics

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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