[jira] [Updated] (HBASE-22408) add a metric for regions OPEN on non-live servers

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-22408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Shelukhin updated HBASE-22408:
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0
                   3.0.0
           Status: Resolved  (was: Patch Available)

Committed to master and branch-2.
Thanks [~Apache9] for the review. 


> add a metric for regions OPEN on non-live servers
> -------------------------------------------------
>
>                 Key: HBASE-22408
>                 URL: https://issues.apache.org/jira/browse/HBASE-22408
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Major
>             Fix For: 3.0.0, 2.3.0
>
>
> This serves 2 purposes for monitoring:
> 1) Catching when regions are on dead servers due to long WAL splitting or other delays in SCP. At that time, the regions are not listed as RITs; we'd like to be able to have alerts in such cases.
> 2) Catching various bugs in assignment and procWAL corruption, etc. that leave region "OPEN" on a server that no longer exists, again to alert the administrator via a metric.
> Later, it might be possible to add more logic to distinguish 1 and 2, and to mitigate 2 automatically and also set some metric to alert the administrator to investigate later.



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