Add a OnManualFlushScheduled callback in event listener #12631
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As titled. Also added the newest user-defined timestamp into the
MemTableInfo
. This can be a useful info in the callback.Added some unit tests as examples for how users can use two separate approaches to allow manual flush / manual compactions to go through when the user-defined timestamps in memtable only feature is enabled. One approach relies on selectively increase cutoff timestamp in
OnMemtableSeal
callback when it's initiated by a manual flush. Another approach is to increase cutoff timestamp inOnManualFlushScheduled
callback. The caveats of the approaches are also documented in the unit test.