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From "Sean Mackrory (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BIGTOP-732) Support running multiple HBase region servers
Date Tue, 09 Oct 2012 17:50:02 GMT
Sean Mackrory created BIGTOP-732:
------------------------------------

             Summary: Support running multiple HBase region servers
                 Key: BIGTOP-732
                 URL: https://issues.apache.org/jira/browse/BIGTOP-732
             Project: Bigtop
          Issue Type: New Feature
            Reporter: Sean Mackrory
            Assignee: Sean Mackrory


Previously on the mailing list I submitted the idea of supporting multiple region server daemons
on the same system. This can be done using the local-regionservers.sh and local-masters.sh
scripts that we remove from our packaging (see BIGTOP-503), but apparently running multiple
region servers in production can be useful. It should be possible through init scripts, and
it should play nice with the more traditional use case.

The modified init script template should make it safe and intuitive to run multiple region
servers and masters on the same system, but only the regionserver package is using the new
template - I don't know of a good reason to run multiple masters in production. Using the
init script as before will control a single region-server daemon EXACTLY as it did before.
If you specify numbers as additional parameters, you can control multiple daemons: 

{noformat} 
service hbase-regionserver start # Starts a single region server daemon, as before
(all other commands, with no additional parameters, will work as before)

service hbase-regionserver start 1 2 3 4 # Starts a single region server daemon
service hbase-regionserver restart 2 4 # Restarts the even daemons
service hbase-regionserver stop 1 3 # Stops the odd daemons
service hbase-regionserver stop # Stops all region servers in any mode of operation
service hbase-regionserver restart 1 2 3 # Stops all region servers, then starts these 3
{noformat} 

I can see a case being made for changing the behavior of the stop and restart commands - so
let me know if you disagree with the path I took. The log files and pid files get put in the
same directory, but are also numbered according to their offset. The force-stop and force-reload
command should also work as expected. When running a single daemon you can't start multiple
daemons, and vice-versa. As recommended by Bruno for LSB-compliance and ease of administration,
you can specify the offsets in /etc/hbase/conf/regionserver_offsets instead of on the command-line.
Specifying offsets on the command-line anyway will override the file.

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