From 1868c56764a380a7dca80429c90b8faf58e2b51f Mon Sep 17 00:00:00 2001
From: "dk.technoboy" <guo.jiwei@immomo.com>
Date: Fri, 20 Dec 2019 15:30:45 +0800
Subject: [PATCH] add sleep 1s for no command

---
 .../server/master/runner/MasterSchedulerThread.java            | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterSchedulerThread.java b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterSchedulerThread.java
index 6e95285ce3..8d7d5a0add 100644
--- a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterSchedulerThread.java
+++ b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterSchedulerThread.java
@@ -128,6 +128,9 @@ public class MasterSchedulerThread implements Runnable {
                             logger.error("scan command error ", e);
                             processDao.moveToErrorCommand(command, e.toString());
                         }
+                    } else{
+                        //indicate that no command ,sleep for 1s
+                        Thread.sleep(Constants.SLEEP_TIME_MILLIS);
                     }
                 }
             }catch (Exception e){