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https://issues.apache.org/jira/browse/KUDU-3430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17676371#comment-17676371
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Alexey Serbin commented on KUDU-3430:
-------------------------------------
If
https://github.com/apache/kudu/commit/2f8778c40edd0114777054a7c2a6b79cc6949f56
introduced a introduced a proper feature flag so the server could tell the
client right away it doesn't support filtering, there would be no such a
strange behavior, I guess.
The server-side filtering approach has a benefit of transferring less data
between the server and the client.
As of current, I'd like to point that a hybrid approach is possible. It will
work as expected against all server-side versions. The idea is to rely on the
server-side filtering for the newer releases (1.12.0 and newer) and do the
client-side filtering if working with servers of earlier releases (1.11.1 and
older). There is a way to get the versioning information from Kudu servers in
the CLI tools: see the {{GetStatus}} RPC and how it's used in
{{ksck_remote.cc}}. Also, there is {{ParseVersion()}} utility function in
{{version_utils.\{h,cc\}}} to help with parsing Kudu version string into a
tuple that can be used in comparisons used by the semantic versioning model.
> Get flags in old version of Kudu may fail
> -----------------------------------------
>
> Key: KUDU-3430
> URL: https://issues.apache.org/jira/browse/KUDU-3430
> Project: Kudu
> Issue Type: Bug
> Reporter: Xixu Wang
> Priority: Major
> Fix For: 1.16.0
>
> Attachments: image-2022-12-29-11-46-52-376.png,
> image-2022-12-30-09-20-43-149.png, screenshot-1.png
>
>
> When using new version of Kudu tool (version: 1.16.0) to execute command:
> _{color:#ff0000}kudu tserver get_flags localhost:7050
> -flags=block_cache_capacity_mb{color}_ in old version of Kudu TServer
> (version: 1.10.1)，it returned all flags not the specified flags.
> !image-2022-12-30-09-20-43-149.png!
>
> That because the filter logic was not implemented in server side (Kudu
> version 1.10.1).
> !image-2022-12-29-11-46-52-376.png!
>
> So it is better to implement the filter logic in Kudu tool side not Kudu
> server side.
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