Ashutosh Mestry updated ATLAS-2460:
    Attachment: ATLAS-2460-Data-Migration.patch

> Data Migration: Moving Data from Earlier Versions of Atlas to be Migrated to 
> Most Recent
> ----------------------------------------------------------------------------------------
>                 Key: ATLAS-2460
>                 URL: https://issues.apache.org/jira/browse/ATLAS-2460
>             Project: Atlas
>          Issue Type: Improvement
>          Components:  atlas-core
>    Affects Versions: trunk
>            Reporter: Ashutosh Mestry
>            Assignee: Ashutosh Mestry
>            Priority: Major
>         Attachments: ATLAS-2460-Data-Migration.patch
> *Background*
> The most recent version of Atlas uses _JanusGraph_ as database. Earlier 
> versions used to use _Titan v0.5.4_. The formats used for storing data have 
> changed.
> The current version of Atlas also implement features within Atlas entities. 
> This makes the storages structures differ.
> A data migration approach thus becomes necessary to address the format 
> incompatibilities.
> *Approach***
> Earlier version of Atlas could use _Export_ process to extract data out of 
> the _Titan_ database. This ZIP file would then be moved to a cluster with 
> newer version of Atlas installed. An _Import_ process on the new cluster 
> would update the new cluster with data migrated to the new format.
> It should be possible for _Data Migration_ to be initiated from Ambari, so 
> that it becomes part of the Ambari's upgrade process.

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