SWF 工作流导致所选工作流的 START_TO_CLOSE答案

【问题标题】：SWF workflow causing START_TO_CLOSE for selected workflowSWF 工作流导致所选工作流的 START_TO_CLOSE
【发布时间】：2018-02-23 02:27:15
【问题描述】：

我在我的一个应用程序中使用 SWF，我使用 ExponentialRetry 连续轮询活动结果。但是有时该活动会导致 START_TO_CLOSE 超时。这不会发生在我的所有工作流程中，并且由于难以调试/重现而发生在 30 分之 1 中。从决策者日志中，我可以在下面看到。有人能解释一下这个问题可能是什么吗？

com.amazon.metrics.swf.AwsSwfMetricsRequestHandler: An error was thrown in previous decision in the thread <SWF Decider AWSFuncTaskList_110.0 7>, task-token <AAAAKgAAAAIAAAAAAAAAAgwtVps42342343434343A3hvItwKY0Vav/Kpexk2cat5fsWkiN1SxhfeoRwVgl+F2/EZQrhBP4RoA41LmLLC77WLU26uSMXaVnl+Cz64x+RZP0sBzofJWdAOdiwHAzsePFNQETXfyl+HibRiYxxO4Xyxn8ndVQ50f97W3IKkwrO7mySJSXbpe6Yaw/AiPmi4f6VoqQo/+nhRSEbzQpKNQeZAaCcAB/6oxEKOgYbW75AF9JsPbZEOdYE7Kq2JVjyghP2id9xAGKgj3ww3d1UBoRFxlulSUsNJmlpgR2+HPyWDHZKF7ECw==>, workflow-execution <RiskAnalysis-313434142331@22NB47i321UtA7w9dPnUTmmtKMeIP1DWrepdAJb0WdGqc=>, domain <Prod>, workflow-type <RiskAnalysisWF@1.7>
        at com.amazon.metrics.swf.DecisionsMetricsExtractor.internalHandlePollForDecisionTask(DecisionsMetricsExtractor.java:183)
        at com.amazon.metrics.swf.DecisionsMetricsExtractor.handlePollForDecisionTask(DecisionsMetricsExtractor.java:168)
        at com.amazon.metrics.swf.AwsSwfMetricsRequestHandler.handlePollForDecisionTask(AwsSwfMetricsRequestHandler.java:508)
        at com.amazon.metrics.swf.AwsSwfMetricsRequestHandler.extractMetrics(AwsSwfMetricsRequestHandler.java:362)
        at com.amazon.metrics.sdk.AwsSdkMetricsRequestHandler.handleCall(AwsSdkMetricsRequestHandler.java:218)
        at com.amazon.metrics.sdk.AwsSdkMetricsRequestHandler.afterResponse(AwsSdkMetricsRequestHandler.java:196)
        at com.amazonaws.http.AmazonHttpClient$RequestExecutor.afterResponse(AmazonHttpClient.java:975)
        at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:746)
        at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:717)
        at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:699)
        at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:667)
        at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:649)
        at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:513)
        at com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient.doInvoke(AmazonSimpleWorkflowClient.java:3390)
        at com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient.invoke(AmazonSimpleWorkflowClient.java:3366)
        at com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient.executePollForDecisionTask(AmazonSimpleWorkflowClient.java:2112)
        at com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient.pollForDecisionTask(AmazonSimpleWorkflowClient.java:2088)
        at com.amazonaws.services.simpleworkflow.flow.worker.DecisionTaskPoller.poll(DecisionTaskPoller.java:191)
        at com.amazonaws.services.simpleworkflow.flow.worker.DecisionTaskPoller.access$000(DecisionTaskPoller.java:39)
        at com.amazonaws.services.simpleworkflow.flow.worker.DecisionTaskPoller$DecisionTaskIterator.next(DecisionTaskPoller.java:71)
        at com.amazonaws.services.simpleworkflow.flow.worker.DecisionTaskPoller$DecisionTaskIterator.next(DecisionTaskPoller.java:45)
        at com.amazonaws.services.simpleworkflow.flow.worker.HistoryHelper$EventsIterator.<init>(HistoryHelper.java:269)
        at com.amazonaws.services.simpleworkflow.flow.worker.HistoryHelper$SingleDecisionEventsIterator.<init>(HistoryHelper.java:74)
        at com.amazonaws.services.simpleworkflow.flow.worker.HistoryHelper.<init>(HistoryHelper.java:318)
        at com.amazonaws.services.simpleworkflow.flow.worker.AsyncDecisionTaskHandler.handleDecisionTask(AsyncDecisionTaskHandler.java:73)
        at com.amazonaws.services.simpleworkflow.flow.worker.DecisionTaskPoller.pollAndProcessSingleTask(DecisionTaskPoller.java:223)
        at com.amazonaws.services.simpleworkflow.flow.worker.GenericWorker$PollServiceTask.run(GenericWorker.java:85)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

【问题讨论】：

活动导致超时是什么意思？
您查看过工作流执行历史记录吗？看的时候通常很容易调试。

标签： amazon-web-services amazon-swf

【解决方案1】：

所有活动在创建时都有一个startToCloseTimeout（由决策者创建）。如果未明确指定，它们将使用在 SWF 中为该活动定义的 default from the versioned ActivityType。您正在达到超时，因为您的重试允许您超过配置的超时。如果您认为需要更多时间，那么在创建活动时，您需要指定startToCloseTimeout as a larger value in the scheduleActivityTaskDecision。

【讨论】：