I prepared a release candidate for 0.4.0 (with cherry-picking @User’s 5470 and 5472). Please check the pinot dev email and help to verify. Also added some notes in the release

A different segment writing logic was introduced in #5256. Although this is backward compatible in a sense that the old segments can be read by the new code, rollback would be tricky since new segments after the upgrade would have been written in the new format, and the old code cannot read those new segments.

@Haibo Wang did you send out an email for RC2?

Yes. To dev@pinot.apache.org yesterday

Got it. Thanks, somehow missed it earlier