java - 即使抛出异常，Lambda 返回 200

Question

我在 AWS Lambda 中部署了以下代码:

public class MyTrigger implements RequestHandler<Request, Void> {

    private final Service service = new Service();

    @Override
    public Void handleRequest(Request request, Context context) {
        service.process(request);
        return null;
    }
}

并且 .process() 方法抛出 IllegalStateException。

使用以下代码“手动”触发此 lambda:

public class LambdaUtils {

    private static final Logger log = LoggerFactory.getLogger(LambdaUtils.class);

    public static Integer invoke(String functionName, String payload) {
        log.info("Invoking lambda {} with payload {}", functionName, payload);
        final AWSLambdaAsync lambdaClient = AWSLambdaAsyncClientBuilder.standard().withRegion(Regions.EU_WEST_1).build();
        final InvokeRequest request = new InvokeRequest();
        request.withFunctionName(functionName).withPayload(payload);
        final InvokeResult invokeResult = lambdaClient.invoke(request);
        final Integer statusCode = invokeResult.getStatusCode();
        log.info("Invoked lambda. Got status code {} and payload {}", statusCode, StandardCharsets.UTF_8.decode(invokeResult.getPayload()).toString());
        return statusCode;
    }
}

问题是，即使 lambda 内部抛出异常，状态代码仍然是 200:调用了 lambda。获得状态代码 200 和负载 [... stacktrace ...]。

我使用以下依赖项来创建客户端并执行调用:

<dependency>
    <groupId>com.amazonaws</groupId>
    <artifactId>aws-java-sdk-lambda</artifactId>
    <version>1.11.297</version>
</dependency>

Answer 1

200 与实际的 lambda 结果或 lambda 本身的实际调用无关。如果您基本上得到 200 以外的任何值，则意味着 lambda 调用无法被接受，这意味着您的 lambda 根本不会被调用。

来自AWS :

The status code in the API response doesn't reflect function errors. Error codes are reserved for errors that prevent your function from executing, such as permissions errors, limit errors, or issues with your function's code and configuration. For example, Lambda returns TooManyRequestsException if executing the function would cause you to exceed a concurrency limit at either the account level (ConcurrentInvocationLimitExceeded) or function level (ReservedFunctionConcurrentInvocationLimitExceeded).