Goals for completion of this ticket:
- Different format for unique indexes. Probably the same thing that wiredtiger is doing – storing duplicates as a list (as oposed to storing RecordIDs as part of keys). This should also enable using bloom filters for duplicate key checks.
- Phase-out old keys in RocksTransaction. Currently all written keys ever are stored in RocksTransaction. We need to remove keys that are not being touched by any currently running transactions.
- Improve rocks_engine metadata. Introduce DB version to support changes in disk format in the future.
- Configure RocksDB + expose some config options to users.
(Copied from email from the submitter)
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SERVER-15271 rocks engine doesn't return capped information in RocksRecordStore::appendCustomStats()
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SERVER-14352 prototype and implement rocksdb storage engine
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SERVER-16632 Change WiredTiger index key format to no longer use BSON
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SERVER-16850 Remove support for touch command for RocksDB
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