Hi Arvid, Thanks for the announcement.
I think we'd better also update the 1.12 release notes[1] and 1.12.1 release blog post[2]. Would you have time to help prepare the warning messages? Thank you~ Xintong Song [1] https://github.com/apache/flink/blob/master/docs/release-notes/flink-1.12.md [2] https://github.com/apache/flink-web/blob/asf-site/_posts/2021-01-19-release-1.12.1.md On Fri, Jan 22, 2021 at 7:40 PM Arvid Heise <[email protected]> wrote: > Dear users, > > Unfortunately, the bug in the unaligned checkpoint that we fixed in 1.12.1 > still occurs under certain circumstances, such that we recommend to not use > unaligned checkpoints in production until 1.12.2. While the normal > processing is not affected by this bug, a recovery with corrupted > checkpoints will not succeed. > > If you have used unaligned checkpoints, you can change back to aligned > checkpoint when starting from an uncorrupted unaligned checkpoint. There is > no easy way to check if a checkpoint is corrupted or not, however, the rare > corruption happens most likely when you have short checkpointing intervals > (<1s), high backpressure, and the previous checkpoint was declined for some > reason. So to be safe, before switching back, make sure that the last > handful of checkpoints all succeeded. > > We have already prepared a fix that we will merge into the release branch > today, but the discussion on when to release 1.12.2 has not started yet. > > Best, > > Arvid >
