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From "Loknath Priyatham Teja Singamsetty (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15924) Enhance hbase services autorestart capability to hbase-daemon.sh
Date Tue, 31 May 2016 14:11:13 GMT
Loknath Priyatham Teja Singamsetty  created HBASE-15924:
-----------------------------------------------------------

             Summary: Enhance hbase services autorestart capability to hbase-daemon.sh 
                 Key: HBASE-15924
                 URL: https://issues.apache.org/jira/browse/HBASE-15924
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 0.98.19
            Reporter: Loknath Priyatham Teja Singamsetty 
             Fix For: 0.98.19


As part of HBASE-5939, the autorestart of hbase services has been added to deal with scenarios
where hbase services (master/regionserver/master-backup) gets killed or goes down leading
to unplanned outages. The changes were made to hbase-daemon.sh with the help of autorestart
option. 

However, the autorestart implementation doesn't work in standalone mode and have few gaps
with the implementation as per release notes of HBASE-5939. Here is an attempt to re-design
and fix the functionality considered all possible usecases with hbase service operations.

Release Notes of HBASE-5939:
------------------------------------------
When launched with autorestart, HBase processes will automatically restart if they are not
properly terminated, either by a "stop" command or by a cluster stop. To ensure that it does
not overload the system when the server itself is corrupted and the process cannot be restarted,
the server sleeps for 5 minutes before restarting if it was already started 5 minutes ago
previously. To use it, launch the process with "bin/start-hbase autorestart". This option
is not fully compatible with the existing "restart" command: if you ask for a restart on a
server launched with autorestart, the server will restart but the next server instance won't
be automatically restarted.






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