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https://issues.apache.org/jira/browse/DRILL-5132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nagarajan Chinnasamy updated DRILL-5132:
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Comment: was deleted
(was: Some of the thoughts on design considerations:
# authenticator must be given a chance to populate context values
#* Generally context values are loaded immediately after (or as the part of)
authentication process
#* Custom authenticators can load custom context values as a result of
authentication process
# If custom authenticators can add values to context, then we need to have a
mechanism to make the context variables to be unique so that they don't clash
with pre-defined system context variables
# Revise the design of "context" class so that it can hold both system defined
and custom defined variables.
# Change [DRILL-4956|https://issues.apache.org/jira/browse/DRILL-4956] and
[DRILL-5043|https://issues.apache.org/jira/browse/DRILL-5043] that assume that
UserSession is the place to generate session id (which is very much one of the
context values) to accommodate externally generated session_id.
#* *session_id* can be provided by an external authenticator. Accommodating
externally generated session_id (with unique prefix) will help better
co-ordination with external systems that provide custom authentication and
context values.)
> Context based dynamic parameterization of views
> -----------------------------------------------
>
> Key: DRILL-5132
> URL: https://issues.apache.org/jira/browse/DRILL-5132
> Project: Apache Drill
> Issue Type: Wish
> Components: Server
> Reporter: Nagarajan Chinnasamy
> Priority: Critical
> Labels: authentication, context, isolation, jdbcstorage,
> multi-tenancy
>
> Its known that Views in SQL cannot have custom dynamic parameters/variables.
> Please refer to [Justin
> Swanhart|http://stackoverflow.com/users/679236/justin-swanhart]'s response to
> [this SO
> question|http://stackoverflow.com/questions/2281890/can-i-create-view-with-parameter-in-mysql]
> in handling dynamic parameterization of views.
> [The PR #685|https://github.com/apache/drill/pull/685]
> [DRILL-5043|https://issues.apache.org/jira/browse/DRILL-5043?filter=-2]
> originated based on this requirement so that we could build views that can
> dynamically filter records based on some dynamic values (like current
> tenant-id, user role etc.)
> *Since Drill's basic unit is a View... having such built-in support can bring
> in dynamism into the whole game.*
> This feature can be utilized for:
> * *Data Isolation in Shared Multi-Tenant environments* based on Custom Tenant
> Discriminator Column
> * *Data Protection in building Chained Views* with Custom Dynamic Filters
> To explain this further, If we assume that:
> # As and when the user connection is established, we populate session context
> with session parameters such as:
> #* Tenant ID of the currently logged in user
> #* Roles of the currently logged in user
> # We expose the session context information through context-based-functions
> such as:
> #* *session_id* -- that returns unique id of the session
> #* *session_parameter('<parameter-name>')* - that returns the value of the
> session parameter
> then a view created with the following kind of query:
> {code}
> create or replace view dynamic_filter_view as select
> a.field as a_field
> b.field as b_field
> from
> a_table as a
> left join
> b_table as b
> on
> a.bId = b.Id
> where
> session_parameter('tenantId')=a.tenantId
> {code}
> becomes a query that has built-in support for dynamic parameterization that
> only returns records of the tenant of the currently logged in user. This is a
> very useful feature in a shared-multi-tenant environment where data is
> isolated using multi-tenant-descriminator column 'tenantId'.
> When building chained views this feature will be useful in filtering records
> based on context based parameters.
> This feature will particularly be useful for data isolation / data protection
> with *jdbc storage plugins* where drill-authenticated-credentials are not
> passed to jdbc connection authentication. A jdbc storage has hard-coded,
> shared credentials. Hence the the responsibility of data isolation / data
> protection lies with Views themselves. Hence, the need for built-in support
> of context based dynamic parameters in Views.
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