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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18562) [AMv2] expireServers and ServerCrashProcedure cleanup
Date Thu, 10 Aug 2017 23:30:00 GMT
stack created HBASE-18562:
-----------------------------

             Summary: [AMv2] expireServers and ServerCrashProcedure cleanup
                 Key: HBASE-18562
                 URL: https://issues.apache.org/jira/browse/HBASE-18562
             Project: HBase
          Issue Type: Bug
          Components: Region Assignment
            Reporter: stack
            Priority: Critical
             Fix For: 2.0.0


In review of HBASE-18551, [~uagashe] posed a scenario that revealed a hole in our processing
of unassigns; there is case where a UP might not get notification from ServerCrashProcedure
if the UP is scheduled AFTER a SCP has gotten past its handleRIT call (No new SCP will be
queued because expireServer won't let it happen if crashed server is in dead server list which
it will be).

Chatting on it, expireServers is doing checks that belong inside ServerCrashProcedure. expireServers
scheduling an SCP each time it is called would make it so SCP processing is serialized one
behind the other. If the first does the clean up all subsequent will do no work but Procedures
dependent on them will get their wakeup call.

This issue is about implementing the above cleanup.



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