diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 20881ea645..c1d9f0d15a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -984,6 +984,8 @@ Release 2.0.5-beta - UNRELEASED
     HDFS-4799. Corrupt replica can be prematurely removed from 
     corruptReplicas map. (todd via kihwal)
 
+    HDFS-4751. TestLeaseRenewer#testThreadName flakes. (Andrew Wang via atm)
+
 Release 2.0.4-alpha - 2013-04-25
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java
index 79ebd81de5..8f3b8fb0e3 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java
@@ -35,6 +35,7 @@
 import org.apache.hadoop.util.Daemon;
 import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.util.Time;
+import com.google.common.annotations.VisibleForTesting;
 
 /**
  * <p>
@@ -323,6 +324,11 @@ public String toString() {
     }
   }
 
+  @VisibleForTesting
+  synchronized void setEmptyTime(long time) {
+    emptyTime = time;
+  }
+
   /** Close a file. */
   void closeFile(final String src, final DFSClient dfsc) {
     dfsc.removeFileBeingWritten(src);
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRenewer.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRenewer.java
index 361e5c304d..6fcb0ed7b8 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRenewer.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRenewer.java
@@ -182,8 +182,6 @@ public void testThreadName() throws Exception {
         renewer.isRunning());
     
     // Pretend to open a file
-    Mockito.doReturn(false)
-      .when(MOCK_DFSCLIENT).isFilesBeingWrittenEmpty();
     renewer.put(filePath, mockStream, MOCK_DFSCLIENT);
     
     Assert.assertTrue("Renewer should have started running",
@@ -194,9 +192,8 @@ public void testThreadName() throws Exception {
     Assert.assertEquals("LeaseRenewer:myuser@hdfs://nn1/", threadName);
     
     // Pretend to close the file
-    Mockito.doReturn(true)
-      .when(MOCK_DFSCLIENT).isFilesBeingWrittenEmpty();
     renewer.closeFile(filePath, MOCK_DFSCLIENT);
+    renewer.setEmptyTime(Time.now());
     
     // Should stop the renewer running within a few seconds
     long failTime = Time.now() + 5000;