diff --git a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/dispatch/ExecutorDispatcher.java b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/dispatch/ExecutorDispatcher.java
index 605297aadf..34c8c8e285 100644
--- a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/dispatch/ExecutorDispatcher.java
+++ b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/dispatch/ExecutorDispatcher.java
@@ -81,9 +81,12 @@ public class ExecutorDispatcher implements InitializingBean {
         /**
          * host select
          */
+
         Host host = hostManager.select(context);
         if (StringUtils.isEmpty(host.getAddress())) {
-            throw new ExecuteException(String.format("fail to execute : %s due to no worker ", context.getCommand()));
+            throw new ExecuteException(String.format("fail to execute : %s due to no suitable worker , " +
+                            "current task need to %s worker group execute",
+                    context.getCommand(),context.getWorkerGroup()));
         }
         context.setHost(host);
         executorManager.beforeExecute(context);
diff --git a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/processor/TaskAckProcessor.java b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/processor/TaskAckProcessor.java
index 3460248dfb..7bc37590aa 100644
--- a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/processor/TaskAckProcessor.java
+++ b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/processor/TaskAckProcessor.java
@@ -70,7 +70,7 @@ public class TaskAckProcessor implements NettyRequestProcessor {
     }
 
     /**
-     *  task ack process
+     * task ack process
      * @param channel channel channel
      * @param command command TaskExecuteAckCommand
      */
diff --git a/dolphinscheduler-server/src/main/resources/worker.properties b/dolphinscheduler-server/src/main/resources/worker.properties
index 9bbf90102c..eb01bbb3ab 100644
--- a/dolphinscheduler-server/src/main/resources/worker.properties
+++ b/dolphinscheduler-server/src/main/resources/worker.properties
@@ -21,9 +21,6 @@
 # worker heartbeat interval
 #worker.heartbeat.interval=10
 
-# submit the number of tasks at a time  TODO
-#worker.fetch.task.num = 3
-
 # only less than cpu avg load, worker server can work. default value -1: the number of cpu cores * 2
 #worker.max.cpuload.avg= -1