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https://issues.apache.org/jira/browse/HBASE-13453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14496682#comment-14496682
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stack commented on HBASE-13453:
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bq. Now, we are stuck in a state where we have made master bind to RS ports in
1.0, which might create some confusion (and frustration) for small cluster
users who traditionally used to host a master and a region server on the same
node.
Too large a change to backport to 1.0.0? Trying it, you can't even set master
ports..that are apart from the regionservers. They'll be overridden. Should we
make a patch for 1.0 so that if the user wants to set master ports apart from
regionserver, they have a fighting chance? (I am here because [~larsgeorge]
noticed this and is having difficulty explaining this 1.0 aberration in his
book update). Thanks.
> Master should not bind to region server ports
> ---------------------------------------------
>
> Key: HBASE-13453
> URL: https://issues.apache.org/jira/browse/HBASE-13453
> Project: HBase
> Issue Type: Improvement
> Reporter: Enis Soztutar
> Assignee: Srikanth Srungarapu
> Priority: Critical
> Fix For: 2.0.0, 1.1.0
>
> Attachments: 34111-2.txt, HBASE-13453.patch, HBASE-13453.patch
>
>
> In 1.0, master by default binds to the region server ports (rpc and info). We
> have done it so thinking that in the long term, master and meta co-location
> will be default, and we can merge the master and region server as a single
> daemon.
> Over at HBASE-11165, if the conclusion end up being that meta will not be
> colocated at all, then master hosting a region server will just become an
> implementation detail. [~saint....@gmail.com] says that we might never allow
> master to host regions.
> Now, we are stuck in a state where we have made master bind to RS ports in
> 1.0, which might create some confusion (and frustration) for small cluster
> users who traditionally used to host a master and a region server on the same
> node.
> I think we should undo this in 1.1 and use the previous master ports (16000)
> and not bind to 16030, so that the user does not need to do anything to bring
> up a RS on the same host. At least users going from 0.98 -> 1.1 will not take
> a hit. Users going from 1.0 -> 1.1 will see changed default ports.
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