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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15924) Enhance hbase services autorestart capability to hbase-daemon.sh
Date Tue, 11 Oct 2016 22:54:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15566876#comment-15566876
] 

Andrew Purtell commented on HBASE-15924:
----------------------------------------

In another test, I started the regionserver with {{./bin/hbase-daemon.sh --autostart-window-retry-limit
3 autostart regionserver}} and in another SSH session then attempted to stop the regionserver
with {{./bin/hbase-daemon.sh stop regionserver}}. This appears to work, although I can see
by tailing the regionserver log output file that the regionserver process is partially restarted
and rapidly killed. I tried again with {{./bin/hbase-daemon.sh autostart regionserver}} i.e.
no limit, then in another SSH session attempted again to stop the regionserver with {{./bin/hbase-daemon.sh
stop regionserver}}, and it worked, but again with multiple partial restarts. Is this supposed
to work? 

> 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 
>            Assignee: Loknath Priyatham Teja Singamsetty 
>             Fix For: 0.98.24
>
>         Attachments: HBASE-15924.master.0001.patch, HBASE-15924.master.0002.patch, HBASE-15924.master.0003.patch
>
>
> As part of HBASE-5939, the autorestart for 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 to support autorestart
option. 
> However, the autorestart implementation doesn't work in standalone mode and other than
that have few gaps with the implementation as per release notes of HBASE-5939. Here is an
attempt to re-design and fix the functionality considering 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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