diff --git a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/task/CommonTaskProcessor.java b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/task/CommonTaskProcessor.java
index 853a8cc7dd..3c330d1e75 100644
--- a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/task/CommonTaskProcessor.java
+++ b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/task/CommonTaskProcessor.java
@@ -20,6 +20,7 @@ package org.apache.dolphinscheduler.server.master.runner.task;
 import org.apache.dolphinscheduler.common.Constants;
 import org.apache.dolphinscheduler.common.enums.ExecutionStatus;
 import org.apache.dolphinscheduler.common.utils.JSONUtils;
+import org.apache.dolphinscheduler.common.utils.StringUtils;
 import org.apache.dolphinscheduler.dao.entity.ProcessInstance;
 import org.apache.dolphinscheduler.dao.entity.TaskInstance;
 import org.apache.dolphinscheduler.remote.command.TaskKillRequestCommand;
@@ -147,7 +148,7 @@ public class CommonTaskProcessor extends BaseTaskProcessor {
             if (taskInstance.getState().typeIsFinished()) {
                 return true;
             }
-            if (null == taskInstance.getHost() || taskInstance.getHost().isEmpty()) {
+            if (StringUtils.isBlank(taskInstance.getHost())) {
                 taskInstance.setState(ExecutionStatus.KILL);
                 taskInstance.setEndTime(new Date());
                 processService.updateTaskInstance(taskInstance);
diff --git a/dolphinscheduler-server/src/main/resources/worker.properties b/dolphinscheduler-server/src/main/resources/worker.properties
index 59887fca34..dc4e47282f 100644
--- a/dolphinscheduler-server/src/main/resources/worker.properties
+++ b/dolphinscheduler-server/src/main/resources/worker.properties
@@ -42,7 +42,7 @@
 # alert server listen host
 #alert.listen.host=localhost
 
-#alert.plugin.dir config the Alert Plugin dir . AlertServer while find and load the Alert Plugin Jar from this dir when deploy and start AlertServer on the server .
+#task.plugin.dir config the #task.plugin.dir config the Task Plugin dir . WorkerServer while find and load the Task Plugin Jar from this dir when deploy and start WorkerServer on the server .
 #task.plugin.dir=lib/plugin/task
 
 #maven.local.repository=/Users/localRepository
diff --git a/sql/dolphinscheduler_postgre.sql b/sql/dolphinscheduler_postgre.sql
index e2dc396948..d1b8822128 100644
--- a/sql/dolphinscheduler_postgre.sql
+++ b/sql/dolphinscheduler_postgre.sql
@@ -675,7 +675,7 @@ CREATE TABLE t_ds_task_instance (
   task_instance_priority int DEFAULT NULL ,
   worker_group varchar(64),
   environment_code bigint DEFAULT NULL,
-  environment_config text DEFAULT '',
+  environment_config text,
   executor_id int DEFAULT NULL ,
   first_submit_time timestamp DEFAULT NULL ,
   delay_time int DEFAULT '0' ,
diff --git a/sql/upgrade/1.4.0_schema/mysql/dolphinscheduler_ddl.sql b/sql/upgrade/1.4.0_schema/mysql/dolphinscheduler_ddl.sql
index 3887ffa4e2..5dc7eb6edb 100644
--- a/sql/upgrade/1.4.0_schema/mysql/dolphinscheduler_ddl.sql
+++ b/sql/upgrade/1.4.0_schema/mysql/dolphinscheduler_ddl.sql
@@ -363,7 +363,7 @@ ALTER TABLE t_ds_error_command ADD COLUMN `environment_code` bigint(20) default
 ALTER TABLE t_ds_schedules ADD COLUMN `environment_code` bigint(20) default NULL COMMENT 'environment code' AFTER `worker_group`;
 ALTER TABLE t_ds_process_instance ADD COLUMN `environment_code` bigint(20) default NULL COMMENT 'environment code' AFTER `worker_group`;
 ALTER TABLE t_ds_task_instance ADD COLUMN `environment_code` bigint(20) default NULL COMMENT 'environment code' AFTER `worker_group`;
-ALTER TABLE t_ds_task_instance ADD COLUMN `environment_config` text default '' COMMENT 'environment config' AFTER `environment_code`;
+ALTER TABLE t_ds_task_instance ADD COLUMN `environment_config` text COMMENT 'environment config' AFTER `environment_code`;
 
 -- ----------------------------
 -- Table structure for t_ds_environment_worker_group_relation
diff --git a/sql/upgrade/1.4.0_schema/postgresql/dolphinscheduler_ddl.sql b/sql/upgrade/1.4.0_schema/postgresql/dolphinscheduler_ddl.sql
index 9373796979..6339ec4282 100644
--- a/sql/upgrade/1.4.0_schema/postgresql/dolphinscheduler_ddl.sql
+++ b/sql/upgrade/1.4.0_schema/postgresql/dolphinscheduler_ddl.sql
@@ -361,7 +361,7 @@ comment on column t_ds_process_instance.environment_code is 'environment code';
 ALTER TABLE t_ds_task_instance ADD COLUMN environment_code bigint DEFAULT NULL;
 comment on column t_ds_task_instance.environment_code is 'environment code';
 
-ALTER TABLE t_ds_task_instance ADD COLUMN environment_config text DEFAULT '';
+ALTER TABLE t_ds_task_instance ADD COLUMN environment_config text;
 comment on column t_ds_task_instance.environment_config is 'environment config';
 
 --