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From "Thomas D'Silva (JIRA)" <>
Subject [jira] [Commented] (PHOENIX-4198) Remove the need for users to have access to the Phoenix SYSTEM tables to create tables
Date Tue, 19 Sep 2017 20:48:00 GMT


Thomas D'Silva commented on PHOENIX-4198:

bq. Actually, if ACL access is not enabled, we do it with the earlier logic(region.mutateRowsWithLocks)
where region server acquiring read locks again during mutation. Not sure why we had required
this with a single region of the system.catalog table as we were already taking lock before,
does it ensure that all rows are written atomically which Htable.batch will not? are there
any consequences of writing set of mutations with HTable.Batch which is not there in region.mutateRowsWithLocks?
Since we already acquire the required locks before calling HTable.Batch would that be atomic
as well ?

If a user has create access on the namespace can he create a view, or does he also need read
access on the data table to create the view? 

I think for creating an index a user should have create access for the schema/namespace. 
While creating an index users that have read access on the data table should also be granted
read access on the index. Users that have write access on the table should be granted write
access on the index, and for mutable indexes they should  be given execute access on the data
table (so that the index metadata can be sent to the server). 

[~karanmehta93] is working on PHOENIX-672 which can be used to grant users  permissions to
the index when permissions are granted on the data table. 

> Remove the need for users to have access to the Phoenix SYSTEM tables to create tables
> --------------------------------------------------------------------------------------
>                 Key: PHOENIX-4198
>                 URL:
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Ankit Singhal
>            Assignee: Ankit Singhal
>              Labels: namespaces
>             Fix For: 4.12.0
>         Attachments: PHOENIX-4198.patch, PHOENIX-4198_v2.patch
> Problem statement:-
> A user who doesn't have access to a table should also not be able to modify  Phoenix
Metadata. Currently, every user required to have a write permission to SYSTEM tables which
is a security concern as they can create/alter/drop/corrupt meta data of any other table without
proper access to the corresponding physical tables.
> [~devaraj] recommended a solution as below.
> 1. A coprocessor endpoint would be implemented and all write accesses to the catalog
table would have to necessarily go through that. The 'hbase' user would own that table. Today,
there is MetaDataEndpointImpl that's run on the RS where the catalog is hosted, and that could
be enhanced to serve the purpose we need.
> 2. The regionserver hosting the catalog table would do the needful for all catalog updates
- creating the mutations as needed, that is.
> 3. The coprocessor endpoint could use Ranger to do necessary authorization checks before
updating the catalog table. So for example, if a user doesn't have authorization to create
a table in a certain namespace, or update the schema, etc., it can reject such requests outright.
Only after successful validations, does it perform the operations (physical operations to
do with creating the table, and updating the catalog table with the necessary mutations).
> 4. In essence, the code that implements dealing with DDLs, would be hosted in the catalog
table endpoint. The client code would be really thin, and it would just invoke the endpoint
with the necessary info. The additional thing that needs to be done in the endpoint is the
validation of authorization to prevent unauthorized users from making changes to someone else's
tables/schemas/etc. For example, one should be able to create a view on a table if he has
read access on the base table. That mutation on the catalog table would be permitted. For
changing the schema (adding a new column for example), the said user would need write permission
on the table... etc etc.
> Thanks [~elserj] for the write-up.

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