fix: reduce Probabilistic non-execution #1033

powerjob-worker-samples/src/main/java/tech/powerjob/samples/processors/test/IdleBugTestProcessor.java

@@ -0,0 +1,46 @@
+package tech.powerjob.samples.processors.test;
+
+import com.google.common.collect.Lists;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+import tech.powerjob.common.utils.CommonUtils;
+import tech.powerjob.worker.core.processor.ProcessResult;
+import tech.powerjob.worker.core.processor.TaskContext;
+import tech.powerjob.worker.core.processor.TaskResult;
+import tech.powerjob.worker.core.processor.sdk.MapReduceProcessor;
+
+import java.util.List;
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * <a href="https://github.com/PowerJob/PowerJob/issues/1033">测试长时间执行的任务 idle 导致 reduce 不执行</a>
+ *
+ * @author tjq
+ * @since 2024/11/21
+ */
+@Slf4j
+@Component
+public class IdleBugTestProcessor implements MapReduceProcessor {
+
+    @Override
+    public ProcessResult process(TaskContext context) throws Exception {
+        if (isRootTask()) {
+            map(Lists.newArrayList("1", "2", "3", "4", "5", "6", "7"), "L1_TASK");
+            return new ProcessResult(true, "MAP_SUCCESS");
+        }
+
+        Object subTask = context.getSubTask();
+        log.info("[IdleBugTestProcessor] subTask:={}, start to process!", subTask);
+
+        // 同步修改 idle 阈值
+        CommonUtils.easySleep(ThreadLocalRandom.current().nextInt(40001, 60000));
+        log.info("[IdleBugTestProcessor] subTask:={}, finished process", subTask);
+        return new ProcessResult(true, "SUCCESS_" + subTask);
+    }
+
+    @Override
+    public ProcessResult reduce(TaskContext context, List<TaskResult> taskResults) {
+        log.info("[IdleBugTestProcessor] [REDUCE] REDUCE!!!");
+        return new ProcessResult(true, "SUCCESS");
+    }
+}

powerjob-worker/src/main/java/tech/powerjob/worker/core/tracker/processor/ProcessorTracker.java

@@ -265,14 +265,21 @@ public class ProcessorTracker {
                 } else {
                     long idleTime = System.currentTimeMillis() - lastIdleTime;
                     if (idleTime > MAX_IDLE_TIME) {
-                        log.warn("[ProcessorTracker-{}] ProcessorTracker have been idle for {}ms, it's time to tell TaskTracker and then destroy self.", instanceId, idleTime);
 
-                        // 不可靠通知，如果该请求失败，则整个任务处理集群缺失一个 ProcessorTracker，影响可接受
-                        ProcessorTrackerStatusReportReq statusReportReq = ProcessorTrackerStatusReportReq.buildIdleReport(instanceId);
-                        statusReportReq.setAddress(workerRuntime.getWorkerAddress());
-                        TransportUtils.ptReportSelfStatus(statusReportReq, taskTrackerAddress, workerRuntime);
-                        destroy();
-                        return;
+                        boolean shouldDestroyWhenIdle = shouldDestroyWhenIdle();
+                        log.warn("[ProcessorTracker-{}] ProcessorTracker have been idle for {}ms, shouldDestroyWhenIdle: {}", instanceId, idleTime, shouldDestroyWhenIdle);
+
+                        if (shouldDestroyWhenIdle) {
+
+                            log.warn("[ProcessorTracker-{}] it's time to tell TaskTracker and then destroy self.", instanceId);
+
+                            // 不可靠通知，如果该请求失败，则整个任务处理集群缺失一个 ProcessorTracker，影响可接受
+                            ProcessorTrackerStatusReportReq statusReportReq = ProcessorTrackerStatusReportReq.buildIdleReport(instanceId);
+                            statusReportReq.setAddress(workerRuntime.getWorkerAddress());
+                            TransportUtils.ptReportSelfStatus(statusReportReq, taskTrackerAddress, workerRuntime);
+                            destroy();
+                            return;
+                        }
                     }
                 }
             }
@@ -300,6 +307,22 @@ public class ProcessorTracker {
 
     }
 
+    /**
+     * 空闲的时候是否需要自我销毁
+     * @return true or false
+     */
+    private boolean shouldDestroyWhenIdle() {
+        /*
+        https://github.com/PowerJob/PowerJob/issues/1033
+        map 情况下，如果子任务执行较长，任务末期可能出现某一个节点的任务仍在执行，其他机器都已经无任务可执行，被 idle 逻辑关闭节点。如果不幸在‘生成reduce任务后并派发前’关闭了 TaskTracker 所在节点的 PT，那 reduce 任务就会直接失败
+        解决方案：同 TT 节点的 PT，本身不存在分布式不一致问题，因此不需要 idle 直接关闭 PT 的机制
+        */
+        if (taskTrackerAddress.equalsIgnoreCase(workerRuntime.getWorkerAddress())) {
+            return false;
+        }
+        return true;
+    }
+
 
     /**
      * 计算线程池大小

powerjob-worker/src/main/java/tech/powerjob/worker/core/tracker/task/heavy/CommonTaskTracker.java

@@ -232,6 +232,8 @@ public class CommonTaskTracker extends HeavyTaskTracker {
 
                             } else {
 
+                                log.info("[TaskTracker-{}] all subTask has done, start to create final task", instanceId);
+
                                 // 不存在，代表前置任务刚刚执行完毕，需要创建 lastTask，最终任务必须在本机执行！
                                 TaskDO newLastTask = new TaskDO();
                                 newLastTask.setTaskName(TaskConstant.LAST_TASK_NAME);

powerjob-worker/src/main/java/tech/powerjob/worker/core/tracker/task/heavy/HeavyTaskTracker.java

@@ -298,7 +298,7 @@ public abstract class HeavyTaskTracker extends TaskTracker {
      * @param heartbeatReq ProcessorTracker（任务的执行管理器）发来的心跳包，包含了其当前状态
      */
     public void receiveProcessorTrackerHeartbeat(ProcessorTrackerStatusReportReq heartbeatReq) {
-        log.debug("[TaskTracker-{}] receive heartbeat: {}", instanceId, heartbeatReq);
+        log.debug("[TaskTracker-{}] receive PT's heartbeat: {}", instanceId, heartbeatReq);
         ptStatusHolder.updateStatus(heartbeatReq);
 
         // 上报空闲，检查是否已经接收到全部该 ProcessorTracker 负责的任务