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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15617) Canary in regionserver mode might not enumerate all regionservers
Date Fri, 08 Apr 2016 16:56:25 GMT
Andrew Purtell created HBASE-15617:

             Summary: Canary in regionserver mode might not enumerate all regionservers
                 Key: HBASE-15617
                 URL: https://issues.apache.org/jira/browse/HBASE-15617
             Project: HBase
          Issue Type: Bug
            Reporter: Andrew Purtell
            Priority: Minor

When running in regionserver mode the Canary is expected to probe for service health one time
per regionserver during a probe interval. 

Each time the canary chore fires, we create a RegionServerMonitor, which uses filterRegionServerByName
(via getAllRegionServerByName) to enumerate over all table descriptors, find the locations
for each table, then assemble the list of regionservers to probe from this result. The list
may not contain all live regionservers, if there is a regionserver up but for some reason
not serving any regions. To ensure we have the complete list of live regionservers I think
it would be better to use Admin#getClusterStatus and enumerate the live server list returned
in the result.

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