Chia-Ping Tsai updated HBASE-18528:
    Summary: DON'T allow user to modify the passed table/column descriptor  
(was: Support to modify TableDescriptor/ColumnFamilyDescriptor through 
MasterObserver; Or disable that.)

> DON'T allow user to modify the passed table/column descriptor
> -------------------------------------------------------------
>                 Key: HBASE-18528
>                 URL: https://issues.apache.org/jira/browse/HBASE-18528
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Coprocessors, master
>            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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