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Add vtctldclient info to the 18.0 summary #14259

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Oct 12, 2023
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Add vtctldclient info to the 18.0 summary #14259

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Add vtctldclient info to the 18.0 summary
mattlord Oct 11, 2023
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Correction
mattlord Oct 11, 2023
761835a
Address review comments
mattlord Oct 12, 2023
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mattlord Oct 12, 2023
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23 changes: 23 additions & 0 deletions changelog/18.0/18.0.0/summary.md
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Expand Up @@ -14,6 +14,7 @@
- **[VTAdmin](#vtadmin)**
- [Updated to node v18.16.0](#update-node)
- **[Deprecations and Deletions](#deprecations-and-deletions)**
- [Legacy Client Binaries](#legacy-client-binaries)
- [Deprecated Flags](#deprecated-flags)
- [Deprecated Stats](#deprecated-stats)
- [Deleted Flags](#deleted-flags)
Expand Down Expand Up @@ -109,6 +110,28 @@ on https://nodejs.org/en/blog/release/v18.16.0.

### <a id="deprecations-and-deletions"/>Deprecations and Deletions

#### <a id="legacy-client-binaries"/>Legacy Client Binaries

`vtctldclient` is our new modern *Vitess controller daemon* (`vtctld`) *client* – which you will use to perform commands
and take actions in your Vitess clusters. It is [replacing the legacy `vtctl`/`vtctlclient` binaries](https://vitess.io/docs/18.0/reference/vtctldclient-transition/overview/).
Some of the benefits are:

- [Dedicated RPCs for each command](https://github.com/vitessio/vitess/blob/release-18.0/proto/vtctlservice.proto#L32-L353)
that are used between `vtctldclient` and `vtctld` – this offers clean separation of commands and makes it easier to
develop new features without impacting other commands. This also presents an [API that other clients (both Vitess and
3rd party) can use to interface with Vitess](https://vitess.io/blog/2023-04-17-vtctldserver-api/).
- Use of modern frameworks: [`pFlag`](https://github.com/spf13/pflag#readme), [`Cobra`](https://cobra.dev), and [`Viper`](https://github.com/spf13/viper#readme).
This makes development easier while also offering a better UX. For example, this offers a way to use
[configuration files](https://vitess.io/docs/18.0/reference/viper/config-files/) with support for
[dynamic configuration](https://vitess.io/docs/18.0/reference/viper/dynamic-values/) ([see also](https://github.com/vitessio/vitess/blob/release-18.0/doc/viper/viper.md)).
- The [reference documentation](https://vitess.io/docs/reference/programs/vtctldclient/) is now built through code. This
removes a burden from developers while helping users by ensuring the docs are always correct and up-to-date.

In Vitess 18.0 we have completed migrating all client commands to `vtctldclient` – the last ones being the [OnlineDDL](https://github.com/vitessio/vitess/issues/13712)
and [VReplication](https://github.com/vitessio/vitess/issues/12152) commands. With this work now completed, the
legacy `vtctl`/`vtctlclient` binaries are now fully deprecated and we plan to remove them in Vitess 19.0. You should
[begin your transition](https://vitess.io/docs/18.0/reference/vtctldclient-transition/) before upgrading to 18.0.

#### <a id="deprecated-flags"/>Deprecated Command Line Flags

Throttler related `vttablet` flags:
Expand Down