从AWS Lambda发布到SNS时超时

我正在尝试通过Lambda函数调用将一些数据发布到SNS，但似乎不起作用.我的功能代码是-

I'm trying to publish some data to SNS from a Lambda function call, but it doesn't seem to be working. My function code is -

public class Handler implements RequestHandler<DynamodbEvent, Void> {

    private static final String SNS_TOPIC_ARN = "arn:aws:sns:us-west-2:account_number:function_name";

    @Override
    public Void handleRequest(DynamodbEvent dynamodbEvent, Context context) {

        LambdaLogger logger = context.getLogger();

        AmazonSNSClient snsClient = new AmazonSNSClient(new DefaultAWSCredentialsProviderChain());
        snsClient.setRegion(Region.getRegion(Regions.US_WEST_2));

        for (DynamodbStreamRecord record : dynamodbEvent.getRecords()) {
            Map<String, AttributeValue> newImage = record.getDynamodb().getNewImage();

            if (newImage == null) {
                continue;
            }

            String sensorId = newImage.get("sensorID").getS();
            long timestamp = Long.parseLong(newImage.get("timestamp").getS());
            double temperature = Double.parseDouble(newImage.get("payload").getM().get("temp").getN());

            String data = sensorId + " " + timestamp + " " + temperature;

            logger.log(data);

            PublishRequest publishRequest = new PublishRequest(SNS_TOPIC_ARN, data);

            PublishResult publishResult = snsClient.publish(publishRequest);

            logger.log("Publish Successful " + publishResult.getMessageId());
        }

        snsClient.shutdown();

        return null;
    }
}

此调用导致超时(10秒)，并且lambda调用失败.如果我注释掉SNS发布部分，即，如果我仅记录从DynamoDB接收到的数据，则可以正常工作.添加SNS发布代码后，它就会超时.

This call results in a timeout (10 seconds) and the lambda invocation fails. If I comment out the SNS publishing part, i.e., if I just log the data received from DynamoDB, it works just fine. As soon as the SNS publishing code is added, it times out.

CloudWatch中记录的超时消息为-

The timeout message logged in CloudWatch is -

START RequestId: 8db74187-459b-42c5-8a06-b3a74873b236 Version: $LATEST END RequestId: 8db74187-459b-42c5-8a06-b3a74873b236 REPORT RequestId: 8db74187-459b-42c5-8a06-b3a74873b236 Duration: 10001.66 ms Billed Duration: 10000 ms Memory Size: 128 MB Max Memory Used: 37 MB Task timed out after 10.00 seconds

START RequestId: 8db74187-459b-42c5-8a06-b3a74873b236 Version: $LATEST END RequestId: 8db74187-459b-42c5-8a06-b3a74873b236 REPORT RequestId: 8db74187-459b-42c5-8a06-b3a74873b236 Duration: 10001.66 ms Billed Duration: 10000 ms Memory Size: 128 MB Max Memory Used: 37 MB Task timed out after 10.00 seconds

我拥有所有适当的权限，并且仅使用在PC上运行的以下代码即可发布到SNS-

I have all the proper permissions in place, and I'm able to publish to SNS using just the following code running on my PC -

PublishRequest publishRequest = new PublishRequest(SNS_TOPIC_ARN, data);
PublishResult publishResult = snsClient.publish(publishRequest);
System.out.println("Publish Successful " + publishResult.getMessageId());

我还尝试使用AmazonSNSAsyncClient代替AmazonSNSClient，它给出的结果相同.

I have also tried using AmazonSNSAsyncClient instead of AmazonSNSClient, it gives the same result.

我在这里想念什么?