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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-20595) Remove the concept of 'special tables' from rsgroups
Date Tue, 22 May 2018 19:12:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-20595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell updated HBASE-20595:
-----------------------------------
    Attachment: HBASE-20595.patch

> 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
>            Assignee: Andrew Purtell
>            Priority: Major
>             Fix For: 3.0.0, 2.1.0, 1.5.0
>
>         Attachments: HBASE-20595-branch-1.patch, HBASE-20595.patch, HBASE-20595.patch
>
>
> 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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