Merge pull request #181 from ekmartin/memtable_bloom

Add set_memtable_prefix_bloom_ratio

src/db_options.rs

@@ -1043,6 +1043,24 @@ impl Options {
         }
     }
 
+    /// When a `prefix_extractor` is defined through `opts.set_prefix_extractor` this creates a
+    /// prefix bloom filter for each memtable with the size of
+    /// `write_buffer_size * memtable_prefix_bloom_ratio` (capped at 0.25).
+    ///
+    /// Default: `0`
+    /// use rocksdb::{Options, SliceTransform};
+    ///
+    /// let mut opts = Options::default();
+    /// let transform = SliceTransform::create_fixed_prefix(10);
+    /// opts.set_prefix_extractor(transform);
+    /// opts.set_memtable_prefix_bloom_ratio(0.2);
+    /// ```
+    pub fn set_memtable_prefix_bloom_ratio(&mut self, ratio: f64) {
+        unsafe {
+            ffi::rocksdb_options_set_memtable_prefix_bloom_size_ratio(self.inner, ratio);
+        }
+    }
+
     /// Specifies the absolute path of the directory the
     /// write-ahead log (WAL) should be written to.
     ///