db::WriterOpts reduce current_buf_size

src/db.rs

@@ -37,7 +37,7 @@ impl Default for WriterOpts {
             compress_lvl: 1,
             data_buf_size: 500 * 1024 * 1024,
             out_buf_size: 200 * 1024 * 1024,
-            current_buf_size: 20 * 1024 * 1024,
+            current_buf_size: 100 * 1024,
         }
     }
 }