[Improvement-13472][Api] Removes the overhead of idle Quartz Threadpool of Api (#13475)

* [fix-13472][Api] change Threadpool of Quartz Scheduler to ZeroSizeThreadPool

* update doc about quartz threadpool configuration

docs/docs/en/architecture/configuration.md

@@ -320,23 +320,37 @@ This part describes quartz configs and configure them based on your practical si
 
 The default configuration is as follows:
 
-|Parameters | Default value|
-|--|--|
-|spring.quartz.properties.org.quartz.threadPool.threadPriority | 5|
-|spring.quartz.properties.org.quartz.jobStore.isClustered | true|
-|spring.quartz.properties.org.quartz.jobStore.class | org.quartz.impl.jdbcjobstore.JobStoreTX|
-|spring.quartz.properties.org.quartz.scheduler.instanceId | AUTO|
-|spring.quartz.properties.org.quartz.jobStore.tablePrefix | QRTZ_|
-|spring.quartz.properties.org.quartz.jobStore.acquireTriggersWithinLock|true|
-|spring.quartz.properties.org.quartz.scheduler.instanceName | DolphinScheduler|
-|spring.quartz.properties.org.quartz.threadPool.class | org.quartz.simpl.SimpleThreadPool|
-|spring.quartz.properties.org.quartz.jobStore.useProperties | false|
-|spring.quartz.properties.org.quartz.threadPool.makeThreadsDaemons | true|
-|spring.quartz.properties.org.quartz.threadPool.threadCount | 25|
-|spring.quartz.properties.org.quartz.jobStore.misfireThreshold | 60000|
-|spring.quartz.properties.org.quartz.scheduler.makeSchedulerThreadDaemon | true|
-|spring.quartz.properties.org.quartz.jobStore.driverDelegateClass | org.quartz.impl.jdbcjobstore.PostgreSQLDelegate|
-|spring.quartz.properties.org.quartz.jobStore.clusterCheckinInterval | 5000|
+|                               Parameters                                |                  Default value                  |
+|-------------------------------------------------------------------------|-------------------------------------------------|
+| spring.quartz.properties.org.quartz.jobStore.isClustered                | true                                            |
+| spring.quartz.properties.org.quartz.jobStore.class                      | org.quartz.impl.jdbcjobstore.JobStoreTX         |
+| spring.quartz.properties.org.quartz.scheduler.instanceId                | AUTO                                            |
+| spring.quartz.properties.org.quartz.jobStore.tablePrefix                | QRTZ_                                           |
+| spring.quartz.properties.org.quartz.jobStore.acquireTriggersWithinLock  | true                                            |
+| spring.quartz.properties.org.quartz.scheduler.instanceName              | DolphinScheduler                                |
+| spring.quartz.properties.org.quartz.jobStore.useProperties              | false                                           |
+| spring.quartz.properties.org.quartz.jobStore.misfireThreshold           | 60000                                           |
+| spring.quartz.properties.org.quartz.scheduler.makeSchedulerThreadDaemon | true                                            |
+| spring.quartz.properties.org.quartz.jobStore.driverDelegateClass        | org.quartz.impl.jdbcjobstore.PostgreSQLDelegate |
+| spring.quartz.properties.org.quartz.jobStore.clusterCheckinInterval     | 5000                                            |
+
+The above configuration items is the same in *Master Server* and *Api Server*, but their *Quartz Scheduler* threadpool configuration is different.
+
+The default quartz threadpool configuration in *Master Server* is as follows:
+
+|                            Parameters                             |           Default value           |
+|-------------------------------------------------------------------|-----------------------------------|
+| spring.quartz.properties.org.quartz.threadPool.makeThreadsDaemons | true                              |
+| spring.quartz.properties.org.quartz.threadPool.threadCount        | 25                                |
+| spring.quartz.properties.org.quartz.threadPool.threadPriority     | 5                                 |
+| spring.quartz.properties.org.quartz.threadPool.class              | org.quartz.simpl.SimpleThreadPool |
+
+Since *Api Server* will not start *Quartz Scheduler* instance, as a client only, therefore it's threadpool is configured as `QuartzZeroSizeThreadPool` which has zero thread;
+The default configuration is as follows:
+
+|                      Parameters                      |                             Default value                             |
+|------------------------------------------------------|-----------------------------------------------------------------------|
+| spring.quartz.properties.org.quartz.threadPool.class | org.apache.dolphinscheduler.scheduler.quartz.QuartzZeroSizeThreadPool |
 
 ### dolphinscheduler_env.sh [load environment variables configs]
 

docs/docs/zh/architecture/configuration.md

@@ -313,23 +313,35 @@ common.properties配置文件目前主要是配置hadoop/s3/yarn/applicationId
 
 默认配置如下：
 
-| 参数 | 默认值 |
-|--|--|
-|spring.quartz.properties.org.quartz.threadPool.threadPriority | 5|
-|spring.quartz.properties.org.quartz.jobStore.isClustered | true|
-|spring.quartz.properties.org.quartz.jobStore.class | org.quartz.impl.jdbcjobstore.JobStoreTX|
-|spring.quartz.properties.org.quartz.scheduler.instanceId | AUTO|
-|spring.quartz.properties.org.quartz.jobStore.tablePrefix | QRTZ_|
-|spring.quartz.properties.org.quartz.jobStore.acquireTriggersWithinLock|true|
-|spring.quartz.properties.org.quartz.scheduler.instanceName | DolphinScheduler|
-|spring.quartz.properties.org.quartz.threadPool.class | org.quartz.simpl.SimpleThreadPool|
-|spring.quartz.properties.org.quartz.jobStore.useProperties | false|
-|spring.quartz.properties.org.quartz.threadPool.makeThreadsDaemons | true|
-|spring.quartz.properties.org.quartz.threadPool.threadCount | 25|
-|spring.quartz.properties.org.quartz.jobStore.misfireThreshold | 60000|
-|spring.quartz.properties.org.quartz.scheduler.makeSchedulerThreadDaemon | true|
-|spring.quartz.properties.org.quartz.jobStore.driverDelegateClass | org.quartz.impl.jdbcjobstore.PostgreSQLDelegate|
-|spring.quartz.properties.org.quartz.jobStore.clusterCheckinInterval | 5000|
+|                                   参数                                    |                       默认值                       |
+|-------------------------------------------------------------------------|-------------------------------------------------|
+| spring.quartz.properties.org.quartz.jobStore.isClustered                | true                                            |
+| spring.quartz.properties.org.quartz.jobStore.class                      | org.quartz.impl.jdbcjobstore.JobStoreTX         |
+| spring.quartz.properties.org.quartz.scheduler.instanceId                | AUTO                                            |
+| spring.quartz.properties.org.quartz.jobStore.tablePrefix                | QRTZ_                                           |
+| spring.quartz.properties.org.quartz.jobStore.acquireTriggersWithinLock  | true                                            |
+| spring.quartz.properties.org.quartz.scheduler.instanceName              | DolphinScheduler                                |
+| spring.quartz.properties.org.quartz.jobStore.useProperties              | false                                           |
+| spring.quartz.properties.org.quartz.jobStore.misfireThreshold           | 60000                                           |
+| spring.quartz.properties.org.quartz.scheduler.makeSchedulerThreadDaemon | true                                            |
+| spring.quartz.properties.org.quartz.jobStore.driverDelegateClass        | org.quartz.impl.jdbcjobstore.PostgreSQLDelegate |
+| spring.quartz.properties.org.quartz.jobStore.clusterCheckinInterval     | 5000                                            |
+
+上述配置项在*Master Server* 和 *Api Server*是相同的，但他们的Quartz线程池配置部分却是不一样的。
+*Master Server* 的Quartz线程池默认配置如下：
+
+|                            Parameters                             |           Default value           |
+|-------------------------------------------------------------------|-----------------------------------|
+| spring.quartz.properties.org.quartz.threadPool.makeThreadsDaemons | true                              |
+| spring.quartz.properties.org.quartz.threadPool.threadCount        | 25                                |
+| spring.quartz.properties.org.quartz.threadPool.threadPriority     | 5                                 |
+| spring.quartz.properties.org.quartz.threadPool.class              | org.quartz.simpl.SimpleThreadPool |
+
+因为*Api Server*不会启动*Quartz Scheduler*实例，只会作为Scheduler客户端使用，因此它的Quartz线程池将会使用`QuartzZeroSizeThreadPool`。`QuartzZeroSizeThreadPool`不会启动任何线程。具体的默认配置如下：
+
+|                      Parameters                      |                             Default value                             |
+|------------------------------------------------------|-----------------------------------------------------------------------|
+| spring.quartz.properties.org.quartz.threadPool.class | org.apache.dolphinscheduler.scheduler.quartz.QuartzZeroSizeThreadPool |
 
 ## dolphinscheduler_env.sh [环境变量配置]
 

dolphinscheduler-api/src/main/resources/application.yaml

@@ -61,17 +61,14 @@ spring:
     jdbc:
       initialize-schema: never
     properties:
-      org.quartz.threadPool.threadPriority: 5
       org.quartz.jobStore.isClustered: true
       org.quartz.jobStore.class: org.springframework.scheduling.quartz.LocalDataSourceJobStore
       org.quartz.scheduler.instanceId: AUTO
       org.quartz.jobStore.tablePrefix: QRTZ_
       org.quartz.jobStore.acquireTriggersWithinLock: true
       org.quartz.scheduler.instanceName: DolphinScheduler
-      org.quartz.threadPool.class: org.quartz.simpl.SimpleThreadPool
+      org.quartz.threadPool.class: org.apache.dolphinscheduler.scheduler.quartz.QuartzZeroSizeThreadPool
       org.quartz.jobStore.useProperties: false
-      org.quartz.threadPool.makeThreadsDaemons: true
-      org.quartz.threadPool.threadCount: 25
       org.quartz.jobStore.misfireThreshold: 60000
       org.quartz.scheduler.makeSchedulerThreadDaemon: true
       org.quartz.jobStore.driverDelegateClass: org.quartz.impl.jdbcjobstore.PostgreSQLDelegate

dolphinscheduler-scheduler-plugin/dolphinscheduler-scheduler-quartz/src/main/java/org/apache/dolphinscheduler/scheduler/quartz/QuartzZeroSizeThreadPool.java

@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.dolphinscheduler.scheduler.quartz;
+
+import org.quartz.simpl.ZeroSizeThreadPool;
+
+public class QuartzZeroSizeThreadPool extends ZeroSizeThreadPool {
+
+    /**
+     * fix spring bug : add getter、setter method for threadCount field
+     * @param count never use
+     */
+    public void setThreadCount(int count) {
+        // do nothing
+    }
+
+    public int getThreadCount() {
+        return -1;
+    }
+}