- Quartz触发线程池废弃并替换为 "XxlJobThreadPool"，降低线程切换、内存占用带来的消耗，提高调度性能；

- 调度线程池隔离，拆分为"Fast"和"Slow"两个线程池，1分钟窗口期内任务耗时达500ms超过10次，该窗口期内判定为慢任务，慢任务自动降级进入"Slow"线程池，避免耗尽调度线程，提高系统稳定性；

README.md

@@ -78,6 +78,7 @@ XXL-JOB是一个轻量级分布式任务调度平台，其核心设计目标是
 - 30、跨平台：原生提供通用HTTP任务Handler（Bean任务，"HttpJobHandler"）；业务方只需要提供HTTP链接即可，不限制语言、平台；
 - 31、国际化：调度中心支持国际化设置，提供中文、英文两种可选语言，默认为中文；
 - 32、容器化：提供官方docker镜像，并实时更新推送dockerhub，进一步实现产品开箱即用；
+- 33、线程池隔离：调度线程池进行隔离拆分，慢任务自动降级进入"Slow"线程池，避免耗尽调度线程，提高系统稳定性；；
 
 
 ## Development

doc/XXL-JOB官方文档.md

@@ -47,6 +47,7 @@ XXL-JOB是一个轻量级分布式任务调度平台，其核心设计目标是
 - 30、跨平台：原生提供通用HTTP任务Handler（Bean任务，"HttpJobHandler"）；业务方只需要提供HTTP链接即可，不限制语言、平台；
 - 31、国际化：调度中心支持国际化设置，提供中文、英文两种可选语言，默认为中文；
 - 32、容器化：提供官方docker镜像，并实时更新推送dockerhub，进一步实现产品开箱即用；
+- 33、线程池隔离：调度线程池进行隔离拆分，慢任务自动降级进入"Slow"线程池，避免耗尽调度线程，提高系统稳定性；；
 
 
 ### 1.3 发展
@@ -1442,9 +1443,9 @@ Tips: 历史版本(V1.3.x)目前已经Release至稳定版本, 进入维护阶段
 - 19、执行器优雅停机优化；
 - 20、连接池配置优化，增强连接有效性验证；
 - 21、JobHandler#msg长度限制，修复异常情况下日志超长导致内存溢出的问题；
-- 22、[迭代中]任务线程隔离：
-    - 执行器测异步响应，不存在阻塞不需要隔离；
-    - 调度中心共用单一调度线程池，可能导致调度阻塞需要线程隔离；调度线程池拆分为Fast/Slow两个，针对调度较慢的执行器地址请求，降级使用Slow线程池；考虑是否可以任务级隔离线程池；
+- 22、Quartz触发线程池废弃并替换为 "XxlJobThreadPool"，降低线程切换、内存占用带来的消耗，提高调度性能；
+- 23、调度线程池隔离，拆分为"Fast"和"Slow"两个线程池，1分钟窗口期内任务耗时达500ms超过10次，该窗口期内判定为慢任务，慢任务自动降级进入"Slow"线程池，避免耗尽调度线程，提高系统稳定性；
+
 
 ### TODO LIST
 - 1、任务分片路由：分片采用一致性Hash算法计算出尽量稳定的分片顺序，即使注册机器存在波动也不会引起分批分片顺序大的波动；目前采用IP自然排序，可以满足需求，待定；

xxl-job-admin/src/main/java/com/xxl/job/admin/core/quartz/XxlJobThreadPool.java

+package com.xxl.job.admin.core.quartz;
+
+import org.quartz.SchedulerConfigException;
+import org.quartz.spi.ThreadPool;
+
+/**
+ * single thread pool, for async trigger
+ *
+ * @author xuxueli 2019-03-06
+ */
+public class XxlJobThreadPool implements ThreadPool {
+
+    @Override
+    public boolean runInThread(Runnable runnable) {
+
+        // async run
+        runnable.run();
+        return true;
+
+        //return false;
+    }
+
+    @Override
+    public int blockForAvailableThreads() {
+        return 1;
+    }
+
+    @Override
+    public void initialize() throws SchedulerConfigException {
+
+    }
+
+    @Override
+    public void shutdown(boolean waitForJobsToComplete) {
+
+    }
+
+    @Override
+    public int getPoolSize() {
+        return 1;
+    }
+
+    @Override
+    public void setInstanceId(String schedInstId) {
+
+    }
+
+    @Override
+    public void setInstanceName(String schedName) {
+
+    }
+
+    // support
+    public void setThreadCount(int count) {
+        //
+    }
+
+}

xxl-job-admin/src/main/java/com/xxl/job/admin/core/thread/JobTriggerPoolHelper.java

@@ -5,10 +5,9 @@ import com.xxl.job.admin.core.trigger.XxlJobTrigger;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.concurrent.LinkedBlockingQueue;
-import java.util.concurrent.ThreadFactory;
-import java.util.concurrent.ThreadPoolExecutor;
-import java.util.concurrent.TimeUnit;
+import java.util.Map;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicInteger;
 
 /**
  * job trigger thread pool helper
@@ -21,32 +20,91 @@ public class JobTriggerPoolHelper {
 
     // ---------------------- trigger pool ----------------------
 
-    private ThreadPoolExecutor triggerPool = new ThreadPoolExecutor(
-            32,
-            256,
+    // fast/slow thread pool
+    private ThreadPoolExecutor fastTriggerPool = new ThreadPoolExecutor(
+            8,
+            200,
             60L,
             TimeUnit.SECONDS,
             new LinkedBlockingQueue<Runnable>(1000),
             new ThreadFactory() {
                 @Override
                 public Thread newThread(Runnable r) {
-                    return new Thread(r, "xxl-job, admin JobTriggerPoolHelper-triggerPool-" + r.hashCode());
+                    return new Thread(r, "xxl-job, admin JobTriggerPoolHelper-fastTriggerPool-" + r.hashCode());
                 }
             });
 
+    private ThreadPoolExecutor slowTriggerPool = new ThreadPoolExecutor(
+            0,
+            100,
+            60L,
+            TimeUnit.SECONDS,
+            new LinkedBlockingQueue<Runnable>(2000),
+            new ThreadFactory() {
+                @Override
+                public Thread newThread(Runnable r) {
+                    return new Thread(r, "xxl-job, admin JobTriggerPoolHelper-slowTriggerPool-" + r.hashCode());
+                }
+            });
+
+
+    // job timeout count
+    private volatile long minTim = System.currentTimeMillis()/60000;     // ms > min
+    private volatile Map<Integer, AtomicInteger> jobTimeoutCountMap = new ConcurrentHashMap<>();
 
+
+    /**
+     * add trigger
+     */
     public void addTrigger(final int jobId, final TriggerTypeEnum triggerType, final int failRetryCount, final String executorShardingParam, final String executorParam) {
-        triggerPool.execute(new Runnable() {
+
+        // choose thread pool
+        ThreadPoolExecutor triggerPool_ = fastTriggerPool;
+        AtomicInteger jobTimeoutCount = jobTimeoutCountMap.get(jobId);
+        if (jobTimeoutCount!=null && jobTimeoutCount.get() > 10) {      // job-timeout 10 times in 1 min
+            triggerPool_ = slowTriggerPool;
+        }
+
+        // trigger
+        triggerPool_.execute(new Runnable() {
             @Override
             public void run() {
-                XxlJobTrigger.trigger(jobId, triggerType, failRetryCount, executorShardingParam, executorParam);
+
+                long start = System.currentTimeMillis();
+
+                try {
+                    // do trigger
+                    XxlJobTrigger.trigger(jobId, triggerType, failRetryCount, executorShardingParam, executorParam);
+                } catch (Exception e) {
+                    logger.error(e.getMessage(), e);
+                } finally {
+
+                    // check timeout-count-map
+                    long minTim_now = System.currentTimeMillis()/60000;
+                    if (minTim != minTim_now) {
+                        minTim = minTim_now;
+                        jobTimeoutCountMap.clear();
+                    }
+
+                    // incr timeout-count-map
+                    long cost = System.currentTimeMillis()-start;
+                    if (cost > 500) {       // ob-timeout threshold 500ms
+                        AtomicInteger timeoutCount = jobTimeoutCountMap.put(jobId, new AtomicInteger(1));
+                        if (timeoutCount != null) {
+                            timeoutCount.incrementAndGet();
+                        }
+                    }
+
+                }
+
             }
         });
     }
 
     public void stop() {
         //triggerPool.shutdown();
-        triggerPool.shutdownNow();
+        fastTriggerPool.shutdownNow();
+        slowTriggerPool.shutdownNow();
         logger.info(">>>>>>>>> xxl-job trigger thread pool shutdown success.");
     }
 

xxl-job-admin/src/main/resources/quartz.properties

@@ -9,16 +9,19 @@ org.quartz.scheduler.rmi.export: false
 org.quartz.scheduler.rmi.proxy: false
 org.quartz.scheduler.wrapJobExecutionInUserTransaction: false
 
-org.quartz.threadPool.class: org.quartz.simpl.SimpleThreadPool
-org.quartz.threadPool.threadCount: 50
-org.quartz.threadPool.threadPriority: 5
-org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread: true
+#org.quartz.threadPool.class: org.quartz.simpl.SimpleThreadPool
+#org.quartz.threadPool.threadCount: 5
+#org.quartz.threadPool.threadPriority: 5
+#org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread: true
 
 org.quartz.jobStore.misfireThreshold: 60000
 org.quartz.jobStore.maxMisfiresToHandleAtATime: 1
 
 #org.quartz.jobStore.class: org.quartz.simpl.RAMJobStore
 
+# for async trigger
+org.quartz.threadPool.class: com.xxl.job.admin.core.quartz.XxlJobThreadPool
+
 # for cluster
 org.quartz.jobStore.tablePrefix: XXL_JOB_QRTZ_
 org.quartz.jobStore.class: org.quartz.impl.jdbcjobstore.JobStoreTX