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A comment on MongoDB Wire Protocol Specification License. Parent comment

Re:MongoDB Wire Protocol Specification License by bogomipz on Wednesday July 21, 2021 @07:45PM (#27913594)
Mongo hasn't used the MMAP storage engine for a long time. In fact it looks like it has even been removed now:

https://docs.mongodb.com/manual/core/storage-engines/

Wired Tiger, the default storage engine is LSM Trees with BTrees for indexes.

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Re:MongoDB Wire Protocol Specification License by matchy on Wednesday July 21, 2021 @08:00PM (#27913695)
Not LSM, all BTrees, but the rest is correct.
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Re:MongoDB Wire Protocol Specification License by bogomipz on Wednesday July 21, 2021 @08:48PM (#27914058)
Not sure of the current state of Mongo but WT certainly has LSM Trees:

http://www.hpts.ws/papers/2013/WiredTiger-HPTS.pdf

http://source.wiredtiger.com/3.2.1/lsm.html

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