[jira] [Updated] (KUDU-1506) Add Consensus "follower lag" time metric

["Grant Henke (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KUDU-1506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Henke updated KUDU-1506:
------------------------------
    Summary: Add Consensus "follower lag" time metric  (was: Add Consensus "follower lag" metrics)

> Add Consensus "follower lag" time metric
> ----------------------------------------
>
>                 Key: KUDU-1506
>                 URL: https://issues.apache.org/jira/browse/KUDU-1506
>             Project: Kudu
>          Issue Type: New Feature
>          Components: consensus, metrics, supportability
>    Affects Versions: 0.9.0
>            Reporter: Mike Percy
>            Priority: Major
>
> 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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