[jira] [Created] (HBASE-18528) Support to modify TableDescriptor/ColumnFamilyDescriptor through MasterObserver; Or disable that.

["Chia-Ping Tsai (JIRA)" <ji...@apache.org>]

Chia-Ping Tsai created HBASE-18528:
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             Summary: Support to modify TableDescriptor/ColumnFamilyDescriptor through MasterObserver; Or disable that.
                 Key: HBASE-18528
                 URL: https://issues.apache.org/jira/browse/HBASE-18528
             Project: HBase
          Issue Type: Sub-task
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai
            Priority: Critical
             Fix For: 3.0.0, 2.0.0-alpha-2


We are replacing the HTableDescriptor by TableDescriptor from code base. The TableDescriptor is designed to be a read-only object so user can't modifiy it through MasterObserver. HBASE-18502 change many methods of MasterObserver to use TableDescriptor but some deprecated methods still accept the HTableDescriptor. User may be confused by why some methods can't modify the table descriptor.

In short, Should we allow user to modify the passed table descriptor?
# if yes, we should introduce a mechanism that user can return a modified table descripror
# if no, we should pass ImmutableHTableDescriptor to user. Or we just remove all methods accepting the HTableDescriptor

Ditto for HColumnDescriptor.



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