Overview
In HDP-3.0+, Apache Atlas uses the JanusGraph graph database to store metadata objects. In earlier versions, Atlas used the Titan graph database for metadata storage. When upgrading to HDP-3.0 and higher versions, you must use a command-line migration tool to migrate the Atlas metadata from Titan to JanusGraph.
- Estimate the size of the existing Atlas repository and the time it will take to export the metadata from HDP 2.x Titan database to the HDP 3.x JanusGraph database.
- Use the Atlas metadata migration tool to export the Atlas metadata from HDP 2.x.
- Import the Atlas metadata into HDP 3.x.