diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
index 073576546c..1611c3c9ce 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
@@ -308,13 +308,6 @@ Map<String, BPOfferService> getBpByNameserviceId() {
     return bpByNameserviceId;
   }
 
-  boolean isSlownodeByNameserviceId(String nsId) {
-    if (bpByNameserviceId.containsKey(nsId)) {
-      return bpByNameserviceId.get(nsId).isSlownode();
-    }
-    return false;
-  }
-
   boolean isSlownodeByBlockPoolId(String bpId) {
     if (bpByBlockPoolId.containsKey(bpId)) {
       return bpByBlockPoolId.get(bpId).isSlownode();
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
index 41088cf59c..2096f18d31 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
@@ -4240,10 +4240,6 @@ public DataSetLockManager getDataSetLockManager() {
     return dataSetLockManager;
   }
 
-  boolean isSlownodeByNameserviceId(String nsId) {
-    return blockPoolManager.isSlownodeByNameserviceId(nsId);
-  }
-
   boolean isSlownodeByBlockPoolId(String bpId) {
     return blockPoolManager.isSlownodeByBlockPoolId(bpId);
   }