Sergey Shelukhin created HBASE-22408:
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Summary: 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
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 add
logic to mitigate 2 automatically and also set some metric to alert the
administrator to investigate later.
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