[ https://issues.apache.org/jira/browse/HBASE-18511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
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). -- This message was sent by Atlassian JIRA (v6.4.14#64029)