+#define PROTOCOL_VERSION 16
+#define MIN_PROTOCOL_VERSION 11
+#define MAX_PROTOCOL_VERSION 20
+
+#define SPARSE_WRITE_SIZE (4*1024)
+#define WRITE_SIZE (32*1024)
+#define CHUNK_SIZE (32*1024)
+#define MAX_MAP_SIZE (4*1024*1024)
+
+#define BLOCKING_TIMEOUT 10