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https://reviews.apache.org/r/51936/
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Review request for atlas and Madhan Neethiraj.
Bugs: ATLAS-1174
https://issues.apache.org/jira/browse/ATLAS-1174
Repository: atlas
Description
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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
Diffs
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repository/src/main/java/org/apache/atlas/services/AtlasTypeUpdate.java
PRE-CREATION
Diff: https://reviews.apache.org/r/51936/diff/
Testing
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Thanks,
Sarath Kumar Subramanian
