diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 036609ad4e5..d4474e5c53d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -225,6 +225,9 @@ Release 2.0.3-alpha - Unreleased
     (Jaimin D Jetly and Jing Zhao via szetszwo)
 
   IMPROVEMENTS
+  
+    HDFS-3925. Prettify PipelineAck#toString() for printing to a log
+    (Andrew Wang via todd)
 
   OPTIMIZATIONS
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PipelineAck.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PipelineAck.java
index c6ac057aa7f..94d9724b8c6 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PipelineAck.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PipelineAck.java
@@ -30,6 +30,8 @@ import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.PipelineAckProto;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.Status;
 
+import com.google.protobuf.TextFormat;
+
 /** Pipeline Acknowledgment **/
 @InterfaceAudience.Private
 @InterfaceStability.Evolving
@@ -120,6 +122,6 @@ public class PipelineAck {
   
   @Override //Object
   public String toString() {
-    return proto.toString();
+    return TextFormat.shortDebugString(proto);
   }
 }