Summary: Replacement of #2147 The change was squashed due to a lot of conflicts. Closes https://github.com/facebook/rocksdb/pull/2194 Differential Revision: D4929799 Pulled By: siying fbshipit-source-id: 5cd49c254737a1d5ac13f3c035f128e86524c581
Summary: Move memtable related files into memtable directory. Closes https://github.com/facebook/rocksdb/pull/2087 Differential Revision: D4829242 Pulled By: yiwu-arbug fbshipit-source-id: ca70ab6