Ashutosh Mestry created ATLAS-2460:
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             Summary: 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


*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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