[jira] [Created] (ATLAS-2251) Remove/replace use of TypeSystem with AtlasTypeRegistry

["Madhan Neethiraj (JIRA)" <ji...@apache.org>]

Madhan Neethiraj created ATLAS-2251:
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             Summary: Remove/replace use of TypeSystem with AtlasTypeRegistry
                 Key: ATLAS-2251
                 URL: https://issues.apache.org/jira/browse/ATLAS-2251
             Project: Atlas
          Issue Type: Task
          Components:  atlas-core
    Affects Versions: 1.0.0
            Reporter: Madhan Neethiraj
            Assignee: Madhan Neethiraj
            Priority: Critical


With introduction of V2 APIs in 0.8 release, Atlas core type-system implementation moved to use AtlasTypeRegistry (which uses data-structures introduced in V2 APIs). However, earlier version equivalent, TypeSystem (which uses V1 data-structures), is still being referenced in few places, like:
 - V1 REST APIs, to covert between V1 and V2 data-structures
 - notification processing, which uses V1 data-structures
 - DSL query implementation
 - AtlasClient API
 - unit tests

Having to support legacy TypeSystem causes run time overhead in duplicate caching of type-information - in AtlasTypeRegistry and TypeSystem. Removing TypeSystem implementation will help eliminate this overhead and also improve maintainability of Atlas sources.

This JIRA is to track removal of TypeSystem implementation and its references; where necessary, references should be updated to use AtlasTypeRegistry equivalent.
- it is very critical to continue to support V1 REST APIs and processing of current V1 notifications 
- existing unit tests that use V1 data-structures will be removed and will be replaced with equivalents that use V2 data-structures
- AtlasClient in new release will only support V2 data-structures; however, older version AtlasClient will continue to work with new version of Atlas server




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