diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
index 4611df765f990..84df75f7cce32 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
@@ -723,7 +723,7 @@ private void addReplicaToReplicasMap(Block block, ReplicaMap volumeMap,
     }
   }
 
-
+  private AtomicLong scanBlockCnt = new AtomicLong(0L);
   /**
    * Add replicas under the given directory to the volume map
    * @param volumeMap the replicas map
@@ -749,6 +749,11 @@ void addToReplicasMap(ReplicaMap volumeMap, File dir,
             lazyWriteReplicaMap, isFinalized, exceptions, subTaskQueue);
         subTask.fork();
         subTaskQueue.add(subTask);
+      } else {
+        long num = scanBlockCnt.get();
+        if (num > 0 && num % 10000 == 0) {
+          LOG.info("Scan process: " + num + " blocks have been scanned.");
+        }
       }
 
       if (isFinalized && FsDatasetUtil.isUnlinkTmpFile(file)) {
@@ -768,6 +773,7 @@ void addToReplicasMap(ReplicaMap volumeMap, File dir,
       Block block = new Block(blockId, file.length(), genStamp);
       addReplicaToReplicasMap(block, volumeMap, lazyWriteReplicaMap,
           isFinalized);
+      scanBlockCnt.incrementAndGet();
     }
   }
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
index 5468473d9de0b..e68845a6fcd32 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
@@ -2102,4 +2102,28 @@ public void delayGetMetaDataInputStream() {
       DataNodeFaultInjector.set(oldDnInjector);
     }
   }
+
+  /**
+   * My patch only adds a log print. Therefore, I cannot write assert judgments.
+   * I can only verify the normal function of addVolume.
+   */
+  @Test
+  public void testLog4AddToReplicasMap() throws IOException {
+    List<NamespaceInfo> nsInfos = Lists.newArrayList();
+    for (String bpid : BLOCK_POOL_IDS) {
+      nsInfos.add(new NamespaceInfo(0, CLUSTER_ID, bpid, 1));
+    }
+    String path = BASE_DIR + "/newData0";
+    String pathUri = new Path(path).toUri().toString();
+    StorageLocation loc = StorageLocation.parse(pathUri);
+    Storage.StorageDirectory sd = createStorageDirectory(
+        new File(path), conf);
+    DataStorage.VolumeBuilder builder =
+        new DataStorage.VolumeBuilder(storage, sd);
+    when(storage.prepareVolume(eq(datanode), eq(loc),
+        anyList()))
+        .thenReturn(builder);
+    dataset.addVolume(loc, nsInfos);
+  }
+
 }