clintropolis opened a new pull request, #13988:
URL: https://github.com/apache/druid/pull/13988
### Description
Follow up to #13854, to add a backwards compatibility mode for users of
Druid 25.0 to upgrade to Druid 26.0 in a manner that allows for errorless
rolling upgrades and downgrades by writing out the older format version.
#### Release note
The `frontCoded` type of `stringEncodingStrategy` on `indexSpec`, has been
improved with a new segment format version which typically has faster read
speeds and reduced segment size. However, this improvement is backwards
incompatible with Druid 25.0, so a new `formatVersion` option has been added,
which defaults to the new `1`, but can be specified as `0` to allow migration
to Druid 26.0 by the way of writing out the older format until the ability to
rollback to Druid 25.0 is no longer determined to be needed.
<hr>
This PR has:
- [ ] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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