我試圖從Lambda函數調用向SNS發佈一些數據,但似乎並沒有工作。我的功能代碼是 -從AWS Lambda發佈到SNS時發生超時
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;
}
}
此調用導致超時(10秒),並且lambda調用失敗。如果我註釋掉SNS發佈部分,即如果我只記錄從DynamoDB接收到的數據,那麼它工作得很好。只要添加了SNS發佈代碼,它就會超時。
登錄CloudWatch的超時消息是 -
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
我擁有所有正確的權限在地方,我能夠發佈只用下面的代碼在我的電腦上運行的SNS來 -
PublishRequest publishRequest = new PublishRequest(SNS_TOPIC_ARN, data);
PublishResult publishResult = snsClient.publish(publishRequest);
System.out.println("Publish Successful " + publishResult.getMessageId());
我也用AmazonSNSAsyncClient
,而不是AmazonSNSClient
,它給出了相同的結果嘗試。
我在這裏錯過了什麼?
嘗試將分配的內存設置增加到最大值。這將加快執行SNS API調用所需的處理。你目前的速度最慢。然後嘗試增加超時秒數。在每個AWS Lambda函數調用中超時收到多少個DynamoDB事件? –
@EricHammond每個lambda調用我只收到1個事件。我懷疑這需要更多的記憶和時間。有效載荷也非常小。另外,當我添加SNS部分時,即使是第一次調用logger.log()(記錄接收到的數據的日誌)也沒有達到。 – Rohan
Java函數啓動速度肯定比較慢,需要比NodeJS或Python函數更多的Lambda內存。我肯定會開始增加超時和可用內存。 –