xichen01 commented on PR #4670:
URL: https://github.com/apache/ozone/pull/4670#issuecomment-1537167895
> @xichen01 The current refresh interface is generic for `OM / SCM`( or
`DN`), format as:
>
> ```shell
> ozone admin reconfig --address=<address> [COMMAND]
> ```
>
> It only applies to a single process, which is not a problem for a small
number of services. However, it may not be a good idea for a large number of
DNs. We can discuss first and then choose a relatively better solution.
>
> 1. **If reconfig from DN**：Is there a good way to refresh in batches?
> 2. **If reconfig from SCM** (it may be necessary to change the command
format to support reconfig by component (such as datanode)) : How to ensure
that all DNs reconfig successfully?
Perhaps we can refer to HDFS and use the command
## Format A
- refresh All live-DNs:
`ozone admin reconfig datanode livenodes [COMMAND]`
- refresh a single DN :
`ozone admin reconfig --address=<address> [COMMAND]`
The `datanode` only be specified if you want to refresh all DNs.
## Format B
- refresh All live-DNs:
`ozone admin reconfig datanode livenodes [COMMAND]`
- refresh a single DN (specified hostname instead of address(ip:port)):
`ozone admin reconfig datanode --address=<hostname> [COMMAND]`
The `datanode` is needed if you want to refresh DN
For `Format A` and `Format B`, the existing commands of recofig SCM/OM do
not need to be modified.
`Format B` clearly specifies that `reconfig` requests are to be sent to DN,
and if we want to implement DN reconfig through the `client --> SCM --> DNs
process`, `Format B` is more appropriate. This allows the SCM to clearly know
whether the reconfig request is sent to itself or needs to be forwarded to the
DN.
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