diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java
index 1c1cbaa8723d..d306fdc55210 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java
@@ -172,7 +172,14 @@ public class TableDescriptorBuilder {
       new Bytes(Bytes.toBytes(NORMALIZER_TARGET_REGION_COUNT));
 
   @InterfaceAudience.Private
+  public static final String NORMALIZER_TARGET_REGION_SIZE_MB = "NORMALIZER_TARGET_REGION_SIZE_MB";
+  private static final Bytes NORMALIZER_TARGET_REGION_SIZE_MB_KEY =
+      new Bytes(Bytes.toBytes(NORMALIZER_TARGET_REGION_SIZE_MB));
+  // TODO: Keeping backward compatability with HBASE-25651 change. Can be removed in later version
+  @InterfaceAudience.Private
+  @Deprecated
   public static final String NORMALIZER_TARGET_REGION_SIZE = "NORMALIZER_TARGET_REGION_SIZE";
+  @Deprecated
   private static final Bytes NORMALIZER_TARGET_REGION_SIZE_KEY =
       new Bytes(Bytes.toBytes(NORMALIZER_TARGET_REGION_SIZE));
 
@@ -884,7 +891,10 @@ public int getNormalizerTargetRegionCount() {
      */
     @Override
     public long getNormalizerTargetRegionSize() {
-      return getOrDefault(NORMALIZER_TARGET_REGION_SIZE_KEY, Long::valueOf, Long.valueOf(-1));
+      long target_region_size =
+        getOrDefault(NORMALIZER_TARGET_REGION_SIZE_MB_KEY, Long::valueOf, Long.valueOf(-1));
+      return target_region_size == Long.valueOf(-1) ? getOrDefault(
+        NORMALIZER_TARGET_REGION_SIZE_KEY, Long::valueOf, Long.valueOf(-1)) : target_region_size;
     }
 
     /**
@@ -912,7 +922,7 @@ public ModifyableTableDescriptor setNormalizerTargetRegionCount(final int region
      * @return the modifyable TD
      */
     public ModifyableTableDescriptor setNormalizerTargetRegionSize(final long regionSize) {
-      return setValue(NORMALIZER_TARGET_REGION_SIZE_KEY, Long.toString(regionSize));
+      return setValue(NORMALIZER_TARGET_REGION_SIZE_MB_KEY, Long.toString(regionSize));
     }
 
     /**
diff --git a/hbase-shell/src/main/ruby/hbase/admin.rb b/hbase-shell/src/main/ruby/hbase/admin.rb
index a546605c621c..d76ab22872f9 100644
--- a/hbase-shell/src/main/ruby/hbase/admin.rb
+++ b/hbase-shell/src/main/ruby/hbase/admin.rb
@@ -1492,7 +1492,13 @@ def update_tdb_from_arg(tdb, arg)
       tdb.setMergeEnabled(JBoolean.valueOf(arg.delete(TableDescriptorBuilder::MERGE_ENABLED))) if arg.include?(TableDescriptorBuilder::MERGE_ENABLED)
       tdb.setNormalizationEnabled(JBoolean.valueOf(arg.delete(TableDescriptorBuilder::NORMALIZATION_ENABLED))) if arg.include?(TableDescriptorBuilder::NORMALIZATION_ENABLED)
       tdb.setNormalizerTargetRegionCount(JInteger.valueOf(arg.delete(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_COUNT))) if arg.include?(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_COUNT)
-      tdb.setNormalizerTargetRegionSize(JLong.valueOf(arg.delete(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_SIZE))) if arg.include?(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_SIZE)
+      # TODO: Keeping backward compatability for NORMALIZER_TARGET_REGION_SIZE with HBASE-25651 change. Can be removed in later version
+      if arg.include?(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_SIZE)
+        warn 'Use of NORMALIZER_TARGET_REGION_SIZE has been deprecated and will be removed in future version, please use NORMALIZER_TARGET_REGION_SIZE_MB instead'
+        tdb.setNormalizerTargetRegionSize(JLong.valueOf(arg.delete(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_SIZE)))
+      end
+      tdb.setNormalizerTargetRegionSize(JLong.valueOf(arg.delete(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_SIZE_MB))) \
+        if arg.include?(TableDescriptorBuilder::NORMALIZER_TARGET_REGION_SIZE_MB)
       tdb.setMemStoreFlushSize(arg.delete(TableDescriptorBuilder::MEMSTORE_FLUSHSIZE)) if arg.include?(TableDescriptorBuilder::MEMSTORE_FLUSHSIZE)
       tdb.setDurability(org.apache.hadoop.hbase.client.Durability.valueOf(arg.delete(TableDescriptorBuilder::DURABILITY))) if arg.include?(TableDescriptorBuilder::DURABILITY)
       tdb.setPriority(JInteger.valueOf(arg.delete(TableDescriptorBuilder::PRIORITY))) if arg.include?(TableDescriptorBuilder::PRIORITY)
diff --git a/hbase-shell/src/main/ruby/shell/commands/alter.rb b/hbase-shell/src/main/ruby/shell/commands/alter.rb
index 22e6e42e69c3..b06ada00248e 100644
--- a/hbase-shell/src/main/ruby/shell/commands/alter.rb
+++ b/hbase-shell/src/main/ruby/shell/commands/alter.rb
@@ -48,7 +48,7 @@ def help
 
 You can also change table-scope attributes like MAX_FILESIZE, READONLY,
 MEMSTORE_FLUSHSIZE, NORMALIZATION_ENABLED, NORMALIZER_TARGET_REGION_COUNT,
-NORMALIZER_TARGET_REGION_SIZE(MB), DURABILITY, etc. These can be put at the end;
+NORMALIZER_TARGET_REGION_SIZE_MB, DURABILITY, etc. These can be put at the end;
 for example, to change the max size of a region to 128MB, do:
 
   hbase> alter 't1', MAX_FILESIZE => '134217728'
diff --git a/hbase-shell/src/test/ruby/hbase/admin_test.rb b/hbase-shell/src/test/ruby/hbase/admin_test.rb
index 309624ae1808..9e7096da9037 100644
--- a/hbase-shell/src/test/ruby/hbase/admin_test.rb
+++ b/hbase-shell/src/test/ruby/hbase/admin_test.rb
@@ -917,6 +917,13 @@ def teardown
       assert_match(/12345678/, admin.describe(@test_name))
     end
 
+    define_test 'alter should be able to set the TargetRegionSizeMB and TargetRegionCount' do
+      command(:alter, @test_name, 'NORMALIZER_TARGET_REGION_COUNT' => 156)
+      assert_match(/156/, admin.describe(@test_name))
+      command(:alter, @test_name, 'NORMALIZER_TARGET_REGION_SIZE_MB' => 234)
+      assert_match(/234/, admin.describe(@test_name))
+    end
+
     define_test 'alter should be able to set the TargetRegionSize and TargetRegionCount' do
       command(:alter, @test_name, 'NORMALIZER_TARGET_REGION_COUNT' => 156)
       assert_match(/156/, admin.describe(@test_name))