Summary:
We have seen cases where it could be good to change TTL on already open DB.
Change ttl in TtlCompactionFilterFactory on open db.
Next time a filter is created, it will filter accroding to the set TTL.
Is this something that could be useful for others?
Any downsides?
Closes https://github.com/facebook/rocksdb/pull/3292
Differential Revision: D6731993
Pulled By: miasantreble
fbshipit-source-id: 73b94d69237b11e8730734389052429d621a6b1e