diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
index b552fa277d049..0a3e61285e7d3 100755
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
@@ -103,7 +103,7 @@ class BPServiceActor implements Runnable {
   
   volatile long lastCacheReport = 0;
   private final Scheduler scheduler;
-  private final Object sendIBRLock;
+  private final Object sendBRLock;
   private final ExecutorService ibrExecutorService;
 
   Thread bpThread;
@@ -161,7 +161,7 @@ enum RunningState {
     }
     commandProcessingThread = new CommandProcessingThread(this);
     commandProcessingThread.start();
-    sendIBRLock = new Object();
+    sendBRLock = new Object();
     ibrExecutorService = Executors.newSingleThreadExecutor(
         new ThreadFactoryBuilder().setDaemon(true)
             .setNameFormat("ibr-executor-%d").build());
@@ -397,10 +397,9 @@ List<DatanodeCommand> blockReport(long fullBrLeaseId) throws IOException {
     // we have a chance that we will miss the delHint information
     // or we will report an RBW replica after the BlockReport already reports
     // a FINALIZED one.
-    synchronized (sendIBRLock) {
-      ibrManager.sendIBRs(bpNamenode, bpRegistration,
-          bpos.getBlockPoolId(), getRpcMetricSuffix());
-    }
+    ibrManager.sendIBRs(bpNamenode, bpRegistration,
+        bpos.getBlockPoolId(), getRpcMetricSuffix());
+
 
     long brCreateStartTime = monotonicNow();
     Map<DatanodeStorage, BlockListAsLongs> perVolumeBlockLists =
@@ -765,7 +764,9 @@ private void offerService() throws Exception {
           LOG.info("Forcing a full block report to " + nnAddr);
         }
         if ((fullBlockReportLeaseId != 0) || forceFullBr) {
-          cmds = blockReport(fullBlockReportLeaseId);
+          synchronized (sendBRLock) {
+            cmds = blockReport(fullBlockReportLeaseId);
+          }
           fullBlockReportLeaseId = 0;
         }
         commandProcessingThread.enqueue(cmds);
@@ -1170,7 +1171,7 @@ public void run() {
           final boolean sendHeartbeat = scheduler.isHeartbeatDue(startTime);
           if (!dn.areIBRDisabledForTests() &&
               (ibrManager.sendImmediately() || sendHeartbeat)) {
-            synchronized (sendIBRLock) {
+            synchronized (sendBRLock) {
               ibrManager.sendIBRs(bpNamenode, bpRegistration,
                   bpos.getBlockPoolId(), getRpcMetricSuffix());
             }