+1 On Sun, Aug 2, 2026 at 5:44 AM Alkis Evlogimenos via dev < [email protected]> wrote:
> +1 (non-binding) > > Great work with the proposal. Time to start hashing out the details! > > On Sat, Aug 1, 2026 at 11:53 AM Divjot Arora via dev < > [email protected]> > wrote: > > > +1 (non-binding) > > > > Thank you Julien, Ryan, and everyone else involved for pushing this > > forward! > > > > — Div > > > > On Sat, Aug 1, 2026 at 08:42 Andrew Lamb <[email protected]> wrote: > > > > > +1 > > > > > > I agree with Neelesh, I believe this will be a major step forward for > > > communicating compatibility across the ecosystem > > > > > > On Fri, Jul 31, 2026 at 5:13 PM Neelesh Salian < > [email protected] > > > > > > wrote: > > > > > > > +1 (non-binding) > > > > > > > > Thank you for all the work that went into getting this to a good > place. > > > > This is a great next step for the community. > > > > > > > > On Fri, Jul 31, 2026 at 14:07 Julien Le Dem <[email protected]> > wrote: > > > > > > > > > Hello everyone, > > > > > > > > > > Following questions on the the previous vote > > > > > <https://lists.apache.org/thread/o8bwmqdy1wf0z459h65x43lnsrldrvhq> > > > > thread, > > > > > here is a new vote essentially proposing the same thing but > > clarifying > > > > the > > > > > specific points raised then. This is the result of our discussions > > over > > > > the > > > > > last two weeks. With the direction set, we'll work on the linked > > design > > > > to > > > > > finalize the implementation details. We decided to start a fresh > vote > > > to > > > > > remove ambiguity of clarifying while voting is happening. See > below. > > > > > > > > > > Julien > > > > > > > > > > This vote is to formalize our intent to use major version numbers > to > > > > bundle > > > > > groups of new features in Parquet. This is especially important to > > > enable > > > > > the safe roll-out of forward incompatible features (examples: new > > > > > encodings). We will separately iron out the implementation details > in > > > > > the Parquet > > > > > Versioning doc > > > > > < > > > > > > > > > > > > > > > https://docs.google.com/document/d/19bOTy1WcLs9NP88DrysG4wG50pM6gmIFaSEWzkxUeJw/edit?tab=t.0#heading=h.qlhnuhge8ke2 > > > > > > > > > > > based on the principles below. > > > > > > > > > > Goals: > > > > > > > > > > - > > > > > > > > > > Have a clear definition of what is forward compatible or not. > > > > > - > > > > > > > > > > Have a clear definition of what supporting a specific Parquet > > > version > > > > > means (for write and for read). > > > > > - > > > > > > > > > > Have clear version numbers for the ecosystem to coordinate on > > what’s > > > > > coming in the next version. Pragmatism will prevail by making > them > > > not > > > > > too > > > > > frequent but not too far apart. > > > > > - > > > > > > > > > > Ensure new features become mainstream in a reasonable amount of > > > time. > > > > > > > > > > > > > > > Specifically, > > > > > > > > > > - > > > > > > > > > > We will accumulate forward-incompatible changes targeted at the > > next > > > > > major version of the Parquet spec (for example Version 3). These > > > > > are called “In > > > > > preview” > > > > > - > > > > > > > > > > The same bar applies as before (two implementations, > > cross-testing, > > > … > > > > > < > > > > > > > > > > > > > > > https://github.com/apache/parquet-format/blob/master/CONTRIBUTING.md#additionschanges-to-the-format > > > > > >) > > > > > to add these features in preview in the spec. > > > > > - > > > > > > > > > > While in preview they can be used for writing with a feature > flag, > > > in > > > > > particular to allow integration testing. All implementations are > > > > > encouraged > > > > > to start being able to read it ASAP (at least two distinct OSS > > > > > implementations are already required to reach this stage). > > > > > - > > > > > > > > > > These new changes will automatically go into the next major > > version. > > > > > (pragmatism applies for exceptions) > > > > > - > > > > > > > > > > We will have a community vote to close and adopt the next major > > > > version. > > > > > - > > > > > > > > > > At this point these features are no longer in preview. Systems > > > > > supporting the new version of Parquet (example: Parquet V3) can > > > start > > > > > using > > > > > it for writing new files by default. (Or communicate what they > > > support > > > > > reading and what they write into files). > > > > > - > > > > > > > > > > In an environment that requires compatibility with at least one > > > system > > > > > that doesn’t support the latest version of Parquet yet, one can > > pin > > > > to a > > > > > specific version by passing a dedicated option to the writer. > > > > (example, > > > > > support reading Parquet V3 but opt to only write Parquet V2 > until > > > the > > > > > environment has upgraded). > > > > > > > > > > > > > > > Please vote in the next 72 hours: > > > > > > > > > > [ ] +1: Adopt versions for forward-incompatible changes > > > > > > > > > > [ ] +0: Not going to block, but prefer . . . > > > > > > > > > > [ ] -1: Do not adopt versions for forward-incompatible changes > > because > > > . > > > > . > > > > > . > > > > > > > > > > > > > > >
