diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java
index 3340ed0..438f478 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java
@@ -154,7 +154,7 @@
 					// wait for message pushed to queue
 					mutex.acquire();
 				} catch (InterruptedException e) {
-					e.printStackTrace();
+					// not an error
 					log.debug("FlowPusherThread is interrupted");
 					return;
 				}
@@ -221,7 +221,7 @@
 					OFMessage msg = queue.poll();
 					try {
 						messageDamper.write(sw, msg, context);
-						log.debug("Pusher sends message : {}", msg);
+//						log.debug("Pusher sends message : {}", msg);
 						size += msg.getLength();
 					} catch (IOException e) {
 						e.printStackTrace();
@@ -434,7 +434,7 @@
 		
 		synchronized (queue) {
 			queue.add(msg);
-			log.debug("Message is pushed : {}", msg);
+//			log.debug("Message is pushed : {}", msg);
 		}
 		
 		if (proc.mutex.availablePermits() == 0) {