diff --git a/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java b/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java
index 0cb3973e0411..0de61f8485d3 100644
--- a/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java
+++ b/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java
@@ -19,6 +19,7 @@
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
+import org.apache.commons.lang3.NotImplementedException;
 import org.apache.hadoop.fs.FSExceptionMessages;
 import org.apache.hadoop.hdds.client.ECReplicationConfig;
 import org.apache.hadoop.hdds.scm.OzoneClientConfig;
@@ -420,6 +421,16 @@ public void flush() {
     LOG.debug("ECKeyOutputStream does not support flush.");
   }
 
+  @Override
+  public void hflush() {
+    throw new NotImplementedException("ECKeyOutputStream does not support hflush.");
+  }
+
+  @Override
+  public void hsync() {
+    throw new NotImplementedException("ECKeyOutputStream does not support hsync.");
+  }
+
   private void closeCurrentStreamEntry()
       throws IOException {
     final ECBlockOutputStreamEntryPool blockOutputStreamEntryPool = getBlockOutputStreamEntryPool();
diff --git a/hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/client/rpc/AbstractTestECKeyOutputStream.java b/hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/client/rpc/AbstractTestECKeyOutputStream.java
index b40b0bbcc626..766ed09bccd5 100644
--- a/hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/client/rpc/AbstractTestECKeyOutputStream.java
+++ b/hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/client/rpc/AbstractTestECKeyOutputStream.java
@@ -16,6 +16,7 @@
  */
 package org.apache.hadoop.ozone.client.rpc;
 
+import org.apache.commons.lang3.NotImplementedException;
 import org.apache.hadoop.hdds.HddsConfigKeys;
 import org.apache.hadoop.hdds.client.DefaultReplicationConfig;
 import org.apache.hadoop.hdds.client.ECReplicationConfig;
@@ -67,6 +68,7 @@
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.fail;
 
 /**
@@ -123,6 +125,8 @@ protected static void init(boolean zeroCopyEnabled) throws Exception {
     conf.setBoolean(OzoneConfigKeys.OZONE_EC_GRPC_ZERO_COPY_ENABLED,
         zeroCopyEnabled);
     conf.setInt(ScmConfigKeys.OZONE_SCM_RATIS_PIPELINE_LIMIT, 10);
+    // "Enable" hsync to verify that hsync would be blocked by ECKeyOutputStream
+    conf.setBoolean(OzoneConfigKeys.OZONE_FS_HSYNC_ENABLED, true);
 
     ClientConfigForTesting.newBuilder(StorageUnit.BYTES)
         .setBlockSize(blockSize)
@@ -469,4 +473,18 @@ private byte[] getInputBytes(int offset, int bufferChunks, int numChunks) {
     return inputData;
   }
 
+  @Test
+  public void testBlockedHflushAndHsync() throws Exception {
+    // Expect ECKeyOutputStream hflush and hsync calls to throw exception
+    try (OzoneOutputStream oOut = TestHelper.createKey(
+        keyString, new ECReplicationConfig(3, 2, ECReplicationConfig.EcCodec.RS, chunkSize),
+        inputSize, objectStore, volumeName, bucketName)) {
+      assertInstanceOf(ECKeyOutputStream.class, oOut.getOutputStream());
+      KeyOutputStream kOut = (KeyOutputStream) oOut.getOutputStream();
+
+      assertThrows(NotImplementedException.class, () -> kOut.hflush());
+      assertThrows(NotImplementedException.class, () -> kOut.hsync());
+    }
+  }
+
 }