diff --git a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/ConfigurationKeys.java b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/ConfigurationKeys.java
index 7561b2679c6ef..3606d83c1f94b 100644
--- a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/ConfigurationKeys.java
+++ b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/ConfigurationKeys.java
@@ -85,7 +85,7 @@ public final class ConfigurationKeys {
   /**
    * What data block buffer to use.
    * <br>
-   * Options include: "disk"(Default), "array", and "bytebuffer".
+   * Options include: "disk", "array", and "bytebuffer"(Default).
    * <br>
    * Default is {@link FileSystemConfigurations#DATA_BLOCKS_BUFFER_DEFAULT}.
    * Value: {@value}
diff --git a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java
index 9cdfd26d2968f..8b96a7a6acd93 100644
--- a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java
+++ b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java
@@ -148,11 +148,13 @@ public final class FileSystemConfigurations {
    */
   public static final String DATA_BLOCKS_BUFFER_DISK = "disk";
 
+  public static final String DATA_BLOCKS_BYTEBUFFER = "bytebuffer";
+
   /**
    * Default buffer option: {@value}.
    */
   public static final String DATA_BLOCKS_BUFFER_DEFAULT =
-      DATA_BLOCKS_BUFFER_DISK;
+          DATA_BLOCKS_BYTEBUFFER;
 
   /** The blockId of each block should be of the same length. */
   public static final int BLOCK_ID_LENGTH = 60;