[GitHub] [hadoop-ozone] jnp commented on pull request #1117: HDDS-3858. Remove support to start Ozone and HDFS datanodes in the same JVM

[GitBox <gi...@apache.org>]

jnp commented on pull request #1117:
URL: https://github.com/apache/hadoop-ozone/pull/1117#issuecomment-648287597


   The option to run them in same JVM was allowed, to support in-place upgrade from HDFS to Ozone in future. It was assumed that having the two Datanodes in the same JVM will certainly simplify Hdfs to Ozone upgrade.
   Some design work happened in past, but not much progress since then. However, that is still a valid goal, IMO.
   Once users are comfortable to switch to Ozone completely, an in-place upgrade option will be desirable to avoid data copy, and will be a way faster option to move to Ozone.


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