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### Unreleased
### New Features
* When reading from option file/string/map, customized comparators and/or merge operators can be filled according to object registry.
+* Introduce Periodic Compaction for Level style compaction. Files are re-compacted periodically and put in the same level.
+
### Public API Change
### Bug Fixes
* Fix a bug in 2PC where a sequence of txn prepare, memtable flush, and crash could result in losing the prepared transaction.