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From Sarath Kumar Subramanian <>
Subject Review Request 51936: Framework to apply updates to types in the type-system
Date Thu, 15 Sep 2016 22:06:13 GMT

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Review request for atlas and Madhan Neethiraj.

Bugs: ATLAS-1174

Repository: atlas


1. Introduce "version" attribute to all types in the type-system, this helps to track changes
made to the default types (hive, sqoop, falcon and storm types) and user created types. If
version is not mentioned during creation of a type, default version "1.0" is assigned (optional
2. Using the version attributed for types, introduce a patch framework for type system. This
framework applies patches to a type using its version number and can be used during upgrade
- add new attributes to an existing types and it will be run during atlas startup.
The sequence of steps:
a. During atlas startup, check $ATLAS_HOME/models/patches directory for any available patch
files (json files). If there any patch files handle them.
b. Sample patch json file looks like:
"patches": [
"action": "ADD_ATTRIBUTE",
"typeName": "hive_column",
"applyToVersion": "1.0",
"updateToVersion": "2.0",
"actionParams": [
{ "name": "position", "dataTypeName": "int", "multiplicity": "optional", "isComposite": false,
"isUnique": false, "isIndexable": false, "reverseAttributeName": null }
} ]
c. The framework updates the type in "typeName" for the matching version number and after
applying the patch, update the version to the one mentioned in "updateToVersion"
d. The json file can have more than one action (array of actions).
e. There can be multiple patch json files in the directory and are applied in the sort order
of the filename. eg:


  repository/src/main/java/org/apache/atlas/services/ PRE-CREATION 




Sarath Kumar Subramanian

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