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https://issues.apache.org/jira/browse/ATLAS-1174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15528662#comment-15528662
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Shwetha G S commented on ATLAS-1174:
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Committing this now, don't see the patch file for position attribute that you
added earlier. You can file a jira for it
> Framework to apply updates to types in the type-system
> ------------------------------------------------------
>
> Key: ATLAS-1174
> URL: https://issues.apache.org/jira/browse/ATLAS-1174
> Project: Atlas
> Issue Type: New Feature
> Reporter: Sarath Subramanian
> Assignee: Sarath Subramanian
> Labels: feature, patch
> Attachments: ATLAS-1174.patch
>
>
> 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 attribute).
> 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:
> 001-hive_column_add_position.json
> 002-hive_column_add_anotherattribute.json
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