yiguolei commented on code in PR #22521:
URL: https://github.com/apache/doris/pull/22521#discussion_r1281901077


##########
fe/fe-common/src/main/java/org/apache/doris/common/Config.java:
##########
@@ -1959,12 +1959,11 @@ public class Config extends ConfigBase {
                     + "when we create table, only support array type nested 
array"})
     public static boolean disable_nested_complex_type  = true;
     /*
-     * "max_instance_num" is used to set the maximum concurrency. When the 
value set
-     * by "parallel_fragment_exec_instance_num" is greater than 
"max_instance_num",
-     * an error will be reported.
+     * "max_instance_num" is used to limit the automatically configured 
concurrency
+     * when "parallel_pipeline_task_num" is set to 0.
      */
     @ConfField(mutable = true)
-    public static int max_instance_num = 128;

Review Comment:
   why this is a config, not a session variable???



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