Snapshot issue

[xiang90]

When the snapshot get large, to send the whole snapshot to a slow follower will not be a good idea.

Should we do incremental snapshot or keep the previous log for a longer time after the snapshot?

[benbjohnson]

I think we should probably have a way to tweak how much of the log to keep around to prevent slow followers from having to grab a snapshot. I think incremental snapshots would be a pain to implement. Maintaining extra log entries is a lot easier.

[xiang90]

Yeah. Let me clean up the snapshot codes and think a way to decide how many previous log we should keep.

[philips]

@xiangli-cmu Perhaps it should just be two or three compactions with a tunable for people who need it?

[xiang90]

We keep the recent NumberOfLogEntriesAfterSnapshot entries to alleviate this problem