diff --git a/hudi-flink/src/main/java/org/apache/hudi/configuration/FlinkOptions.java b/hudi-flink/src/main/java/org/apache/hudi/configuration/FlinkOptions.java
index 6e0ff5207..64b308d6f 100644
--- a/hudi-flink/src/main/java/org/apache/hudi/configuration/FlinkOptions.java
+++ b/hudi-flink/src/main/java/org/apache/hudi/configuration/FlinkOptions.java
@@ -325,19 +325,19 @@ public class FlinkOptions extends HoodieConfig {
       .key("write.index_bootstrap.tasks")
       .intType()
       .noDefaultValue()
-      .withDescription("Parallelism of tasks that do index bootstrap, default is 4");
+      .withDescription("Parallelism of tasks that do index bootstrap, default is the parallelism of the environment");
 
   public static final ConfigOption<Integer> BUCKET_ASSIGN_TASKS = ConfigOptions
       .key("write.bucket_assign.tasks")
       .intType()
       .noDefaultValue()
-      .withDescription("Parallelism of tasks that do bucket assign, default is 4");
+      .withDescription("Parallelism of tasks that do bucket assign, default is the parallelism of the environment");
 
   public static final ConfigOption<Integer> WRITE_TASKS = ConfigOptions
       .key("write.tasks")
       .intType()
-      .defaultValue(4)
-      .withDescription("Parallelism of tasks that do actual write, default is 4");
+      .noDefaultValue()
+      .withDescription("Parallelism of tasks that do actual write, default is the parallelism of the environment");
 
   public static final ConfigOption<Double> WRITE_TASK_MAX_SIZE = ConfigOptions
       .key("write.task.max.size")