diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java
index fb6d83fcc6bd6..cd9fb8e490be9 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java
@@ -631,6 +631,7 @@ private int sendPacket(ByteBuffer pkt, int maxChunks, OutputStream out,
          * 
          * Reporting of this case is done in DataXceiver#run
          */
+        LOG.warn("Sending packets timed out.", e);
       } else {
         /* Exception while writing to the client. Connection closure from
          * the other end is mostly the case and we do not care much about