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[Proposal] Utilities for reading, transforming and creating Streaming savepoints


Hi All!

I want to share with you a little project we have been working on at King
(with some help from some dataArtisans folks). I think this would be a
valuable addition to Flink and solve a bunch of outstanding production
use-cases and headaches around state bootstrapping and state analytics.

We have built a quick and dirty POC implementation on top of Flink 1.6,
please check the README for some nice examples to get a quick idea:

https://github.com/king/bravo

*Short story*
Bravo is a convenient state reader and writer library leveraging the
Flink’s batch processing capabilities. It supports processing and writing
Flink streaming savepoints. At the moment it only supports processing
RocksDB savepoints but this can be extended in the future for other state
backends and checkpoint types.

Our goal is to cover a few basic features:

   - Converting keyed states to Flink DataSets for processing and analytics
   - Reading/Writing non-keyed operators states
   - Bootstrap keyed states from Flink DataSets and create new valid
   savepoints
   - Transform existing savepoints by replacing/changing some states


Some example use-cases:

   - Point-in-time state analytics across all operators and keys
   - Bootstrap state of a streaming job from external resources such as
   reading from database/filesystem
   - Validate and potentially repair corrupted state of a streaming job
   - Change max parallelism of a job


Our main goal is to start working together with other Flink production
users and make this something useful that can be part of Flink. So if you
have use-cases please talk to us :)
I have also started a google doc which contains a little bit more info than
the readme and could be a starting place for discussions:

https://docs.google.com/document/d/103k6wPX20kMu5H3SOOXSg5PZIaYpwdhqBMr-ppkFL5E/edit?usp=sharing

I know there are a bunch of rough edges and bugs (and no tests) but our
motto is: If you are not embarrassed, you released too late :)

Please let me know what you think!

Cheers,
Gyula