[jira] [Created] (HDDS-4046) Extensible subcommands for CLI applications

["Marton Elek (Jira)" <ji...@apache.org>]

Marton Elek created HDDS-4046:
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             Summary: Extensible subcommands for CLI applications
                 Key: HDDS-4046
                 URL: https://issues.apache.org/jira/browse/HDDS-4046
             Project: Hadoop Distributed Data Store
          Issue Type: Improvement
            Reporter: Marton Elek
            Assignee: Marton Elek


HDDS-3814 proposed a new subcommand which deletes the column families from the rocksdb tables.

But during the discussion there was no consensus if it's safe to add or not.

This patch makes the sub-commands easy to extend. Anybody can extend the main ozone shell commands with new sub-commands. 

Sub-commands can be added to the classpath and activated by Service Provider Interface (meta-inf/services/...).

This is an optional feature, current approach works forward (annotation based sub-command definition). 

And it's not only about HDDS-3814.

It makes it easier to organize the sub-commands. (For example RDBStore related commands can be moved to the rdb classes, they will be picked up).

It makes possible to provide additional, ad-hoc tools during debug or support which can help to solve/debug specific problems. 









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