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From "Loknath Priyatham Teja Singamsetty (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15924) Enhance hbase services autorestart capability to hbase-daemon.sh
Date Thu, 22 Sep 2016 14:28:21 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Loknath Priyatham Teja Singamsetty  updated HBASE-15924:
    Release Note: 
Now one can start hbase services with enabled "autostart/autorestart" feature in controlled
fashion with the help of "--autostart-window-size" to define the window period and the "--autostart-window-retry-limit"
to define the number of times the hbase services have to be restarted upon being killed/terminated
abnormally within the provided window perioid.

The following cases are supported with "autostart/autorestart":

a) --autostart-window-size=0 and --autostart-window-retry-limit=0, indicates infinite window
size and no retry limit
b) not providing the args, will default to a)
c) --autostart-window-size=0 and --autostart-window-retry-limit=<positive value> indicates
the autostart process to bail out if the retry limit exceeds irrespective of window period
d) --autostart-window-size=<x> and --autostart-window-retry-limit=<y> indicates
the autostart process to bail out if the retry limit "y" is exceeded for the last window period

          Status: Patch Available  (was: In Progress)

> 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: 0.98.23
>         Attachments: HBASE-15924.master.0001.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
> 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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