[jira] [Commented] (HBASE-15549) Undo HMaster carrying regions in master branch as default

["Duo Zhang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-15549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400405#comment-17400405 ] 

Duo Zhang commented on HBASE-15549:
-----------------------------------

Recently I've been thinking that, maybe we could start an in process region server when maintenance mode is on. We just need a region server to hold the system regions, no matter whether it is master or not, and we even do not need them to start a on the same port.

Will try to see if this is possible. If this could be done, then I think we could finally undo HMaster extends HRegionServer.

Thanks.

> Undo HMaster carrying regions in master branch as default
> ---------------------------------------------------------
>
>                 Key: HBASE-15549
>                 URL: https://issues.apache.org/jira/browse/HBASE-15549
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer, master
>            Reporter: Michael Stack
>            Priority: Major
>         Attachments: 15549.patch
>
>
> I thought we had an issue to do this but I can't find it so here is a new one.
> Currently, in master branch, HMaster is a RegionServer and carries meta regions such as hbase:meta. Disable this facility by default until better thought through (I think we should undo master ever carrying regions; FBers are thinking we should go forward with notion that master carries meta/system regions. TODO). I want to disable it because this facility is not finished and meantime I want to test new stuff coming in on master branch w/o this new feature getting in the way.
> Parking here a patch that has how to disable master carrying regions and a probably redundant test that ensures all works when master is not carrying meta regions (added because it WASN'T working for me -- but was pilot error).



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