问题描述
我使用的是 AWS CDK。当我部署时,根据 AWS 控制台中的 CloudFormation Events,resources(CfnTrigger)
中的 createWorkflow
在 createDDBCrawler
和 createS3Crawler
之前被初始化。这是导致 create_Failed(Entity not found)
的原因,因为 createWorkflow
取决于这两个中的资源。
所以我想知道:
AWS CDK 资源生成序列(因为我在函数中没有看到
async
或promise
,所以 TypeScript 正在按顺序处理代码。那么这是 CDK/CloudFormation 行为?)>-
如何避免这种情况或安排资源创建顺序,除了创建两个堆栈。
export class Quicksightglue extends Construct {
constructor(scope: Construct,name: string,props: QuicksightglueProps) {
super(scope,name);
this.createglueDb(props.glueDb);
for (let zone of zones) {
const ddbCrawler = this.createDDBCrawler(...);
const etlJob = this.createEtlJob(...);
// crawler for processed data
this.createS3Crawler(...);
// create workflow that use crawler
this.createWorkflow(...);
}
}
private createS3Crawler(...) {
return new glue.CfnCrawler(this,'s3Crawler_' + zone,{
name: 's3Crawler_' + zone,databaseName: glueDb,role: roleArn,targets: {
s3Targets: [{ path: s3 }]
}
});
}
private createWorkflow(...) {
const extracDdbWorkflow = new glue.CfnWorkflow(this,`ExtractDdb_` + zone,{
name: `udhcpExtractDdb_` + zone.toLowerCase(),description: "Workflow to extract and process data from DDB"
});
const scheduledTriggerDdbCrawler = new glue.CfnTrigger(this,'DdbTrigger_' + zone,{
workflowName: extracDdbWorkflow.name,type: "SCHEDULED",schedule: scheduleCronExpression,//"cron(0 * * * ? *)",description: "Trigger to start the workflow every hour to update ddb data",actions: [{
crawlerName: ddbCrawler,}],});
...
解决方法
您可以通过在构造的 addDependency
属性上调用 node
来使构造变得依赖于另一个构造,如下所示:
// Normally these two constructs would be created in parallel
const construct1 = ...;
const construct2 = ...;
// But with this line,construct2 will not be created until construct 1 is
construct2.node.addDependency(construct1);
Here 是一个实际例子。
可能您想将 createS3Crawler
的返回值保存到一个变量中,然后将该变量作为参数传递给 createWorkflow
。然后,createWorkflow
将对其内部创建的每个构造调用 .node.addDependency(createS3Crawler)
,该构造依赖于 S3 爬虫。