*: add an option to disable write-ahead-log.

src/merge_operator.rs

@@ -41,7 +41,6 @@ pub extern "C" fn name_callback(raw_cb: *mut c_void) -> *const c_char {
     }
 }
 
-#[allow(too_many_arguments)]
 pub extern "C" fn full_merge_callback(raw_cb: *mut c_void,
                                       raw_key: *const c_char,
                                       key_len: size_t,
@@ -75,7 +74,6 @@ pub extern "C" fn full_merge_callback(raw_cb: *mut c_void,
     }
 }
 
-#[allow(too_many_arguments)]
 pub extern "C" fn partial_merge_callback(raw_cb: *mut c_void,
                                          raw_key: *const c_char,
                                          key_len: size_t,

src/rocksdb.rs

@@ -440,6 +440,12 @@ impl DB {
         self.write_opt(batch, &WriteOptions::new())
     }
 
+    pub fn write_withou_wal(&self, batch: WriteBatch) -> Result<(), String> {
+        let mut wo = WriteOptions::new();
+        wo.disable_wal();
+        self.write_opt(batch, &wo)
+    }
+
     pub fn get_opt(&self,
                    key: &[u8],
                    readopts: &ReadOptions)

src/rocksdb_options.rs

@@ -377,9 +377,16 @@ impl WriteOptions {
     pub fn new() -> WriteOptions {
         WriteOptions::default()
     }
+
     pub fn set_sync(&mut self, sync: bool) {
         unsafe {
             rocksdb_ffi::rocksdb_writeoptions_set_sync(self.inner, sync);
         }
     }
+
+    pub fn disable_wal(&mut self) {
+        unsafe {
+            rocksdb_ffi::rocksdb_writeoptions_disable_WAL(self.inner, 1);
+        }
+    }
 }