Estimating migration time and resources required

You must plan your migration process by checking on the time and resources that are required.

While the cluster is starting up, you can plan for and start the migration process.

1. Inspect Navigator installation to determine the number of Navigator entities that will be migrationed. See Understanding migrated Navigator entites
2. Estimate the time and disk space required for each phase of the migration.

   The following migration rates are approximate and depend on the resources available on the Atlas host and other unknown factors. Note that the number of entities actually imported may be considerably less than the number of entities extracted. The migration process discards HDFS entities that are not referenced by processes that are migrationed such as Hive, Impala, and Spark).

Migration Phase	Migration Rate	Disk Space	Output File Size	Trial Data Points
Extraction	4 minutes / 1 million entities	100 MB / 1 million entities, less as volumes increase	65 MB / 1 million entities	10 million entities takes about 30 minutes; 256 million takes about 18 hours.
Transformation	1.5 minutes / 1 million entities	100 to 150 MB / 1 million entities, higher end of range with larger volumes	150 MB / 1 million entities	10 million entities takes about 20 minutes; 256 million takes about 6 hours.
Import	35 minutes / 1 million migrated entities	N/A	N/A	10 million entities takes about 4 hours; 256 million takes about 6 days.