[DS-6323][fix] EventExecuteService run loop without sleep which make cpu high (#6324)

Co-authored-by: caishunfeng <534328519@qq.com>

dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/EventExecuteService.java

@@ -17,6 +17,7 @@
 
 package org.apache.dolphinscheduler.server.master.runner;
 
+import org.apache.dolphinscheduler.common.Constants;
 import org.apache.dolphinscheduler.common.enums.ExecutionStatus;
 import org.apache.dolphinscheduler.common.enums.StateEvent;
 import org.apache.dolphinscheduler.common.enums.StateEventType;
@@ -36,6 +37,7 @@ import org.apache.commons.lang.StringUtils;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -104,6 +106,8 @@ public class EventExecuteService extends Thread {
             try {
                 eventHandler();
 
+                TimeUnit.MILLISECONDS.sleep(Constants.SLEEP_TIME_MILLIS);
+
             } catch (Exception e) {
                 logger.error("Event service thread error", e);
             }