我需要运行一个AWS Step函数，该函数运行一个并行状态机，例如两个状态机。我的要求是检查并行计算机的最终执行状态，如果有任何故障，请调用SNS服务以发送电子邮件。很标准的东西，但对我来说，我无法弄清楚如何捕获并行步进机的综合误差。此示例并行机运行
如果我执行此计算机，则此计算机正确显示passtask成功，failtask被取消，Total Parallel Task成功（?????），Notify Failure任务被取消以及状态机的整体执行“ failed”也一样
我希望密码任务成功，失败任务失败，整体并行任务失败，通知失败任务成功。
{
"Comment": "Parallel Example",
"StartAt": "Parallel Task",
"TimeoutSeconds": 120,
"States": {
"Parallel Task": {
"Type": "Parallel",
"Branches": [
{
"StartAt": "passtask",
"States": {
"passtask": {
"Type": "Task",
"Resource":"arn:xxxxxxxxxxxxxxx:function:passfunction",
"End": true
}
}
},
{
"StartAt": "failtask",
"States": {
"failtask": {
"Type": "Task",
"Resource":"arn: xxxxxxxxxxxxxxx:function:failfunction",
"End": true
}
}
}
],
"ResultPath": "$.status",
"Catch": [
{
"ErrorEquals": ["States.ALL"],
"Next": "Notify Failure"
}
],
"Next": "Notify Success"
},
"Notify Failure": {
"Type": "Pass",
"InputPath": "$.input.Cause",
"End": true
},
"Notify Success": {
"Type": "Pass",
"Result": "This is a fallback from a task success",
"End": true
}
}
}
答案 0 :(得分：1)
根据您的要求“我的要求是检查并行计算机的最终执行状态，如果有任何故障，请调用SNS服务以发送电子邮件。”，我了解到“ failtask”仅用于调试目的，并在将来不会失败。因此，问题是，在步进功能检测到分支中的故障时，所有其他分支都将终止，并且其输出将被丢弃，仅使用故障分支的输出。因此，如果要保留每个分支的输出并检查是否发生了故障，则需要处理每个分支中的错误，而不要将整个分支报告为失败。另外，您将需要向每个分支添加一个输出字段，该字段说明是否失败（如果字段不存在，则选择状态将给出错误）。还要记住，ParralelState的输出是一个数组，其中包含每个Branch的输出，例如，此状态机应让每个分支完成执行并正确处理错误：
{
"Comment": "Parallel Example",
"StartAt": "Parallel Task",
"TimeoutSeconds": 120,
"States": {
"Parallel Task": {
"Type": "Parallel",
"Branches": [{
"StartAt": "passtask",
"States": {
"passtask": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:XXXXXXXXXXXXXXXXX",
"Next": "SuccessBranch1",
"Catch": [{
"ErrorEquals": ["States.ALL"],
"Next": "FailBranch1"
}]
},
"SuccessBranch1": {
"Type": "Pass",
"Result": {
"Error": false
},
"ResultPath": "$.Status",
"End": true
},
"FailBranch1": {
"Type": "Pass",
"Result": {
"Error": true
},
"ResultPath": "$.Status",
"End": true
}
}
},
{
"StartAt": "failtask",
"States": {
"failtask": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:XXXXXXXXXXXXXXXXX",
"Next": "SuccessBranch2",
"Catch": [{
"ErrorEquals": ["States.ALL"],
"Next": "FailBranch2"
}]
},
"SuccessBranch2": {
"Type": "Pass",
"Result": {
"Error": false
},
"ResultPath": "$.Status",
"End": true
},
"FailBranch2": {
"Type": "Pass",
"Result": {
"Error": true
},
"ResultPath": "$.Status",
"End": true
}
}
}
],
"ResultPath": "$.ParralelOutput",
"Catch": [{
"Comment": "This catch should never catch any errors, as the error handling is done in the individual Branches",
"ErrorEquals": ["States.ALL"],
"ResultPath": "$.ParralelOutput",
"Next": "ChoiceStateX"
}],
"Next": "ChoiceStateX"
},
"ChoiceStateX": {
"Type": "Choice",
"Choices": [{
"Or": [{
"Variable": "$.ParralelOutput[0].Status.Error",
"BooleanEquals": true
},
{
"Variable": "$.ParralelOutput[1].Status.Error",
"BooleanEquals": true
}
],
"Next": "Notify Failure"
}],
"Default": "Notify Success"
},
"Notify Failure": {
"Type": "Pass",
"End": true
},
"Notify Success": {
"Type": "Pass",
"Result": "This is a fallback from a task success",
"End": true
}
}
}
关于控制台报告的内容（成功完成Parrarel状态，并且在任务状态上未显示错误），看起来控制台有点坏，如果您在Parralel State中发现任何错误，它将报告为成功，并且同样，如果您的任何分支机构失败，它也不会由于某种原因将该分支报告为失败。因此，不必担心控制台显示的内容，并确保流程正常运行。可以通过用FailState替换Task State来测试：
{
"Comment": "Parallel Example",
"StartAt": "Parallel Task",
"TimeoutSeconds": 120,
"States": {
"Parallel Task": {
"Type": "Parallel",
"Branches": [
{
"StartAt": "passtask",
"States": {
"passtask": {
"Type": "Succeed"
}
}
},
{
"StartAt": "failtask",
"States": {
"failtask": {
"Type": "Fail"
}
}
}
],
"ResultPath": "$.status",
"Catch": [
{
"ErrorEquals": ["States.ALL"],
"Next": "Notify Failure"
}
],
"Next": "Notify Success"
},
"Notify Failure": {
"Type": "Pass",
"End": true
},
"Notify Success": {
"Type": "Pass",
"Result": "This is a fallback from a task success",
"End": true
}
}
}