diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSDataInputStream.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSDataInputStream.java
index c8609d450f..6d39d1e0b8 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSDataInputStream.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSDataInputStream.java
@@ -58,7 +58,7 @@ public class FSDataInputStream extends DataInputStream
    * @param desired offset to seek to
    */
   @Override
-  public synchronized void seek(long desired) throws IOException {
+  public void seek(long desired) throws IOException {
     ((Seekable)in).seek(desired);
   }
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 756b70fc18..78aa992fbe 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -851,6 +851,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7698. Fix locking on HDFS read statistics and add a method for
     clearing them. (Colin P. McCabe via yliu)
 
+    HDFS-7741. Remove unnecessary synchronized in FSDataInputStream and
+    HdfsDataInputStream. (yliu)
+
 Release 2.6.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/HdfsDataInputStream.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/HdfsDataInputStream.java
index 72c57a860b..e8ac6865e4 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/HdfsDataInputStream.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/HdfsDataInputStream.java
@@ -83,7 +83,7 @@ public class HdfsDataInputStream extends FSDataInputStream {
   /**
    * Get the collection of blocks that has already been located.
    */
-  public synchronized List<LocatedBlock> getAllBlocks() throws IOException {
+  public List<LocatedBlock> getAllBlocks() throws IOException {
     return getDFSInputStream().getAllBlocks();
   }