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Andrew Purtell commented on HBASE-20595: ---------------------------------------- bq. we'll probably need to document "can't turn on rsgroup feature" as a limitation of single-node deployments. Ah, no, better that the constraint that system tables cannot be placed into the same rsgroup as user tables be what is optional. > Remove the concept of 'special tables' from rsgroups > ---------------------------------------------------- > > Key: HBASE-20595 > URL: https://issues.apache.org/jira/browse/HBASE-20595 > Project: HBase > Issue Type: Task > Components: Region Assignment, rsgroup > Reporter: Andrew Purtell > Priority: Major > Fix For: 3.0.0, 2.1.0, 1.5.0 > > > Regionserver groups needs to specially handle what it calls "special tables", > tables upon which core or other modular functionality depends. They need to > be excluded from normal rsgroup processing during bootstrap to avoid circular > dependencies or errors due to insufficiently initialized state. I think we > also want to ensure that such tables are always given a rsgroup assignment > with nonzero servers. (IIRC another issue already raises that point, we can > link it later.) > Special tables include: > * The system tables in the 'hbase:' namespace > * The ACL table if the AccessController coprocessor is installed > * The Labels table if the VisibilityController coprocessor is installed > * The Quotas table if the FS quotas feature is active > Either we need a facility where "special tables" can be registered, which > should be in core. Or, we institute a blanket rule that core and all > extensions that need a "special table" must put them into the 'hbase:' > namespace, so the TableName#isSystemTable() test will return TRUE for all, > and then rsgroups simply needs to test for that. -- This message was sent by Atlassian JIRA (v7.6.3#76005)