[HUDI-3652] use threadlocal to decrease ObjectSizeCalculator memory use

[HUDI-3652] Make ObjectSizeCalculator threadlocal to reduce memory footprint

hudi-common/src/main/java/org/apache/hudi/common/util/ObjectSizeCalculator.java

@@ -54,6 +54,8 @@
  * @author Attila Szegedi
  */
 public class ObjectSizeCalculator {
+  private static final ThreadLocal<ObjectSizeCalculator> objectSizeCalculator = ThreadLocal.withInitial(() -> new ObjectSizeCalculator(CurrentLayout.SPEC));
+
   private static class CurrentLayout {
 
     private static final MemoryLayoutSpecification SPEC = getEffectiveMemoryLayoutSpecification();
@@ -71,7 +73,7 @@ private static class CurrentLayout {
    * @throws UnsupportedOperationException if the current vm memory layout cannot be detected.
    */
   public static long getObjectSize(Object obj) throws UnsupportedOperationException {
-    return obj == null ? 0 : new ObjectSizeCalculator(CurrentLayout.SPEC).calculateObjectSize(obj);
+    return obj == null ? 0 : objectSizeCalculator.get().calculateObjectSize(obj);
   }
 
   // Fixed object header size for arrays.