Snapshotting partial chunks to disk for faster restarts

[GANESH VERNEKAR]

Hi All,

Now that we are close to concluding the m-mapping of in-memory chunks to disk, I would like to propose some further enhancement for the WAL replay.

I have summarised the idea in this design doc: https://docs.google.com/document/d/1c90BmhErybHH94hoGNsgJC9pyaUTU3dgHoyD3dm6Kw4/edit?usp=sharing

Please give your feedback!

Thanks,

Ganesh