Tomasz Grabiec 78844fa2e5 db: Use incremental selector in partition_presence_checker ...

This reduces the number of sstables we need to check to only those
whose token range overlaps with the key. Reduces cache update
time. Especially effective with leveled compaction strategy.

Refs #1943.

Incremental selector works with an immutable sstable set, so cache
updates need to be serialized. Otherwise we could mispopulate due to
stale presence information.

Presence checker interface was changed to accept decorated key in
order to gain easy access to the token, which is required by
the incremental selector.

2016-12-19 14:20:58 +01:00

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