diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBPOfferService.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBPOfferService.java
index 45355d4f1b..bf919e16fc 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBPOfferService.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBPOfferService.java
@@ -44,6 +44,8 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
+import java.util.TreeSet;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -55,6 +57,7 @@
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.protocol.Block;
+import org.apache.hadoop.hdfs.protocol.BlockListAsLongs.BlockReportReplica;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB;
@@ -109,8 +112,6 @@ public class TestBPOfferService {
   private long firstLeaseId = 0;
   private long secondLeaseId = 0;
   private long nextFullBlockReportLeaseId = 1L;
-  private int fullBlockReportCount = 0;
-  private int incrBlockReportCount = 0;
 
   static {
     GenericTestUtils.setLogLevel(DataNode.LOG, Level.ALL);
@@ -233,14 +234,6 @@ public HeartbeatResponse answer(InvocationOnMock invocation)
     }
   }
 
-  private void setBlockReportCount(int count) {
-    fullBlockReportCount = count;
-  }
-
-  private void setIncreaseBlockReportCount(int count) {
-    incrBlockReportCount += count;
-  }
-
   /**
    * Test that the BPOS can register to talk to two different NNs,
    * sends block reports to both, etc.
@@ -288,6 +281,7 @@ public void testMissBlocksWhenReregister() throws Exception {
     Thread addNewBlockThread = null;
     final AtomicInteger count = new AtomicInteger(0);
     DataNodeFaultInjector prevDNFaultInjector = null;
+    Set<Long> blocks = new TreeSet<>();
     try {
       waitForBothActors(bpos);
       waitForInitialization(bpos);
@@ -303,7 +297,7 @@ public void blockUtilSendFullBlockReport() {
         }
       });
 
-      countBlockReportItems(FAKE_BLOCK, mockNN1);
+      countBlockReportItems(FAKE_BLOCK, mockNN1, blocks);
       addNewBlockThread = new Thread(() -> {
         for (int i = 0; i < totalTestBlocks; i++) {
           SimulatedFSDataset fsDataset = (SimulatedFSDataset) mockFSDataset;
@@ -334,14 +328,12 @@ public void blockUtilSendFullBlockReport() {
       addNewBlockThread = null;
       // Verify FBR/IBR count is equal to generate number.
       try {
-        GenericTestUtils.waitFor(() ->
-            (fullBlockReportCount == totalTestBlocks ||
-                incrBlockReportCount == totalTestBlocks), 1000, 15000);
+        GenericTestUtils.waitFor(() -> blocks.size() == totalTestBlocks,
+            1000, 15000);
       } catch (Exception e) {
-        fail(String.format("Timed out wait for IBR counts FBRCount = %d,"
-                + " IBRCount = %d; expected = %d. Exception: %s",
-            fullBlockReportCount, incrBlockReportCount, totalTestBlocks,
-            e.getMessage()));
+        fail(String.format("Timed out waiting for blocks count. "
+            + "reported = %d, expected = %d. Exception: %s",
+            blocks.size(), totalTestBlocks, e.getMessage()));
       }
 
     } finally {
@@ -711,7 +703,8 @@ private void setTimeForSynchronousBPOSCalls() {
    * which assume no deleting blocks here.
    */
   private void countBlockReportItems(final ExtendedBlock fakeBlock,
-      final DatanodeProtocolClientSideTranslatorPB mockNN) throws Exception {
+      final DatanodeProtocolClientSideTranslatorPB mockNN,
+      final Set<Long> blocks) throws Exception {
     final String fakeBlockPoolId = fakeBlock.getBlockPoolId();
     final ArgumentCaptor<StorageBlockReport[]> captor =
         ArgumentCaptor.forClass(StorageBlockReport[].class);
@@ -720,7 +713,9 @@ private void countBlockReportItems(final ExtendedBlock fakeBlock,
     Mockito.doAnswer((Answer<Object>) invocation -> {
       Object[] arguments = invocation.getArguments();
       StorageBlockReport[] list = (StorageBlockReport[])arguments[2];
-      setBlockReportCount(list[0].getBlocks().getNumberOfBlocks());
+      for (BlockReportReplica brr : list[0].getBlocks()) {
+        blocks.add(brr.getBlockId());
+      }
       return null;
     }).when(mockNN).blockReport(
         Mockito.any(),
@@ -734,7 +729,9 @@ private void countBlockReportItems(final ExtendedBlock fakeBlock,
       Object[] arguments = invocation.getArguments();
       StorageReceivedDeletedBlocks[] list =
           (StorageReceivedDeletedBlocks[])arguments[2];
-      setIncreaseBlockReportCount(list[0].getBlocks().length);
+      for (ReceivedDeletedBlockInfo rdbi : list[0].getBlocks()) {
+        blocks.add(rdbi.getBlock().getBlockId());
+      }
       return null;
     }).when(mockNN).blockReceivedAndDeleted(
         Mockito.any(),
@@ -1233,4 +1230,4 @@ public void testCommandProcessingThreadExit() throws Exception {
       }
     }
   }
-}
\ No newline at end of file
+}