chunk replication api
diff --git a/chunk/primary.go b/chunk/primary.go
new file mode 100644
index 0000000..7120eaa
--- /dev/null
+++ b/chunk/primary.go
@@ -0,0 +1,5 @@
+package chunk
+
+func NewPrimaryReplicaChunk(chunkId, primaryChunkServer string) Chunk {
+	return nil
+}