10) When removing one or more branches of a Btree because one or more BINs are empty (all records in the BIN are deleted). Does not apply to deferred-write DBs. Is done asynchronously by the INCompressor background thread. I'm afraid each MapLN is written twice during this procedure.I need to correct myself. When the INCompressor thread wakes up and one or more BINs are empty, it will perform a "reverse split" to delete each empty BIN. Each reverse split logs the BIN's ancestor INs and its database MapLN (once). The MapLN is logged again at the end of the batch of reverse splits performed by the INCompressor thread. So if there is only one empty BIN in a database, its MapLN will be logged twice. But when there are many (N) empty BINs in a database, its MapLN will be logged (N + 1) times, not (N * 2) times.