[1.3.6-prepare][Improvement][Common] Optimize HashMap Initial Capacity #4896 (#4920)

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/controller/BaseController.java

@@ -43,7 +43,7 @@ public class BaseController {
      * @return check result code
      */
     public Map<String, Object> checkPageParams(int pageNo, int pageSize) {
-        Map<String, Object> result = new HashMap<>(2);
+        Map<String, Object> result = new HashMap<>(4);
         Status resultEnum = Status.SUCCESS;
         String msg = Status.SUCCESS.getMsg();
         if (pageNo <= 0) {
@@ -197,7 +197,7 @@ public class BaseController {
         result.setCode(Status.SUCCESS.getCode());
         result.setMsg(Status.SUCCESS.getMsg());
 
-        Map<String, Object> map = new HashMap<>(4);
+        Map<String, Object> map = new HashMap<>(8);
         map.put(Constants.TOTAL_LIST, totalList);
         map.put(Constants.CURRENT_PAGE, currentPage);
         map.put(Constants.TOTAL_PAGE, totalPage);

dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/utils/CollectionUtils.java

@@ -69,6 +69,11 @@ public class CollectionUtils {
         return coll == null || coll.isEmpty();
     }
 
+    /**
+     * The load factor used when none specified in constructor.
+     */
+    static final float DEFAULT_LOAD_FACTOR = 0.75f;
+
     /**
      * String to map
      *
@@ -97,7 +102,8 @@ public class CollectionUtils {
             return emptyMap;
         }
         String[] strings = str.split(separator);
-        Map<String, String> map = new HashMap<>(strings.length);
+        int initialCapacity = (int)(strings.length / DEFAULT_LOAD_FACTOR) + 1;
+        Map<String, String> map = new HashMap<>(initialCapacity);
         for (int i = 0; i < strings.length; i++) {
             String[] strArray = strings[i].split("=");
             if (strArray.length != 2) {

dolphinscheduler-service/src/main/java/org/apache/dolphinscheduler/service/quartz/QuartzExecutors.java

@@ -331,7 +331,7 @@ public class QuartzExecutors {
    * @return data map
    */
   public static Map<String, Object> buildDataMap(int projectId, int scheduleId, Schedule schedule) {
-    Map<String, Object> dataMap = new HashMap<>(3);
+    Map<String, Object> dataMap = new HashMap<>(8);
     dataMap.put(PROJECT_ID, projectId);
     dataMap.put(SCHEDULE_ID, scheduleId);
     dataMap.put(SCHEDULE, JSONUtils.toJson(schedule));