Loknath Priyatham Teja Singamsetty  commented on HBASE-15924:

[~apurtell] [~larsh] [~lhofhansl] [~giacomotaylor]

Please review the changes submitted to support autorestart with enhanced 
capability to configure. Please note that as part of this change, some of the 
helper scripts under "bin" are modified to fix identified bugs while testing 
autostart functionality in local, pseudo-distributed and distributed modes.

Release notes: 
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 "x".


> 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 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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