JAVA-1154: Lower GridFS.DEFAULT_CHUNKSIZE from 256K to 255K so that chunks inserted into a collection using power-of-two allocator do not waste a lot of space

Author: jyemin

src/main/com/mongodb/gridfs/GridFS.java

@@ -49,7 +49,7 @@ public class GridFS {
     /**
      * file's chunk size
      */
-    public static final int DEFAULT_CHUNKSIZE = 256 * 1024;
+    public static final int DEFAULT_CHUNKSIZE = 255 * 1024;
 
     /**
      * file's max chunk size