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https://issues.apache.org/jira/browse/HBASE-18511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Busbey updated HBASE-18511:
--------------------------------
Release Note:
Changes the configuration hbase.balancer.tablesOnMaster from list of table
names that the can carry (with 'none' meaning no tables on the master) to
instead be a boolean that is set to true if master carries tables/regions and
false if it does not. If true, the master acts like any regionserver.
If false, then the master carries no tables. This is the default for
hbase-2.0.0.
Another boolean configuration, hbase.balancer.tablesOnMaster.systemTablesOnly,
when set to true, enables hbase.balancer.tablesOnMaster and makes it so the
master hosts system tables exclusively (the long-time deploy mode of master
branch and branch-2 up until this commit).
The change of hbase.balancer.tablesOnMaster from String list to boolean and
the addition of a simple boolean to enable system-tables on Master was done
to constrain what operators might ask for via this master configuration.
Stipulating what tables are bound to the Master server verges into
regionserver grouping territory, a more robust means of specifying table
and server combinations. Operators should use this latter if they want
layouts more exotic than those supplied by the provided booleans.
was:
Changes the configuration hbase.balancer.tablesOnMaster from list of table
names that the can carry (with 'none' meaning no tables on the master) to
instead be a boolean that is set to true if master carries tables/regions and
false if it does not. If true, the master acts like any regionserver.
If false, then the master carries no tables. This is the default for
hbase-2.0.0.
Another boolean configuration, hbase.balancer.tablesOnMaster.systemTablesOnly,
when set to true, enables hbase.balancer.tablesOnMaster and makes it so the
master hosts system tables exclusively (the long-time deploy mode of master
branch and branch-2 up until this commit).
> Default no regions on master
> ----------------------------
>
> Key: HBASE-18511
> URL: https://issues.apache.org/jira/browse/HBASE-18511
> Project: HBase
> Issue Type: Task
> Components: master
> Reporter: stack
> Assignee: stack
> Priority: Blocker
> Fix For: 2.0.0
>
> Attachments: HBASE-18511.master.001.patch,
> HBASE-18511.master.002.patch, HBASE-18511.master.003.patch,
> HBASE-18511.master.004.patch, HBASE-18511.master.005.patch,
> HBASE-18511.master.006.patch, HBASE-18511.master.007.patch
>
>
> Let this be umbrella issue for no-regions-on-master as default deploy (as it
> was in branch-1).
> Also need to make sure we can run WITH regions on master; in particular
> system tables with RPC short-circuit as it is now in hbase master.
> Background is that master branch carried a change that allowed Master carry
> regions. On top of this improvement on branch-1, Master defaulted to carry
> system tables only. No release was made with this configuration. Now we are
> going to cut the 2.0.0 release, the decision is that hbase-2 should have the
> same layout as hbase-1 so this issue implements the undoing of Master
> carrying system tables by default (though the capability remains).
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