Andrew Purtell created HBASE-20595:
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Summary: 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
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.
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