Sean Mackrory created BIGTOP-732:
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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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