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Posted to issues@ozone.apache.org by "Jitendra Nath Pandey (Jira)" <ji...@apache.org> on 2020/06/23 16:54:00 UTC
[jira] [Commented] (HDDS-3858) Remove support to start Ozone and
HDFS datanodes in the same JVM
[ https://issues.apache.org/jira/browse/HDDS-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17143111#comment-17143111 ]
Jitendra Nath Pandey commented on HDDS-3858:
--------------------------------------------
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.
> Remove support to start Ozone and HDFS datanodes in the same JVM
> ----------------------------------------------------------------
>
> Key: HDDS-3858
> URL: https://issues.apache.org/jira/browse/HDDS-3858
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: Marton Elek
> Assignee: Marton Elek
> Priority: Major
> Labels: pull-request-available
>
> With a few thousands issues ago Ozone was integral part of Hadoop/HDFS project. At that time there were two options to start datanode:
> 1. Start in a separated JVM
> 2. Start in the same JVM with the HDFS
> Today only 1 is the standard way, this is tested and working. 2nd is not working any more but still documented.
> I propose to drop the support of this use case as I can't see any benefit to support it anymore:
> 1. I think 100% of the users will use Ozone as a separated process not as a HDFS Datanode plugin
> 2. Fixing the classpath issues is significant effort as the classpath of HDFS and Ozone are diverged.
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