lambda 中的 Java AWSClient 引用

Question

我正在使用用 java 编写的 lambda 函数来监听 s3 存储桶创建对象requesthandler将调用另一个类“testDownload”来下载对象

当某事发生时AmazonS3 s3 = AmazonS3ClientBuilder.standard().build();已初始化，我在 try catch block 中使用它并检查是否引发异常并且云监视中没有显示错误。你能帮我了解发生了什么吗

public class S3EventProcessor implements RequestHandler<S3Event, String> {
private final org.slf4j.Logger logger = LoggerFactory.getLogger(this.getClass());
private final String ASSET_TYPE = (String) "jpg";
public String handleRequest(S3Event s3event, Context context) {
....
....
t.download(Bucket,Key);


import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.model.S3ObjectInputStream;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;


public class testDownload {
private final org.slf4j.Logger logger =  LoggerFactory.getLogger(this.getClass());

public void download(String bucketName,String key) throws IOException {


    try {
        logger.info("Downloading an object \n");
        logger.info("Building s3 client");
        AmazonS3 s3 = AmazonS3ClientBuilder.standard().build();
        logger.info("success");
        S3Object o = s3.getObject(bucketName, key);
        S3ObjectInputStream s3is = o.getObjectContent();
        FileOutputStream fos = new FileOutputStream(new File(key));
        byte[] read_buf = new byte[1024];
        int read_len = 0;
        while ((read_len = s3is.read(read_buf)) > 0) {
            fos.write(read_buf, 0, read_len);
        }
        s3is.close();
        fos.close();
    } catch (AmazonServiceException e) {
        logger.error(e.getErrorMessage());
        System.exit(1);
    } catch (FileNotFoundException e) {
        logger.error(e.getMessage());
        System.exit(1);
    } catch (IOException e) {
        logger.error(e.getMessage());
        System.exit(1);
    } catch (Exception e){
        logger.error(e.getStackTrace().toString());
        System.exit(1);
    }
}

}

云日志

19:25:34,229 INFO testDownload:24 - Downloading an object 

19:25:34,229 INFO testDownload:25 - Building s3 client
END RequestId: someid
REPORT RequestId: someid    Duration:   3003.13 ms  Billed Duration: 3000 ms Memory Size: 128 MB    Max Memory     Used: 52 MB  
2017-10-21T19:25:36.150Z someid Task timed out after 3.00 seconds

Answer 1

Lambda 的默认超时为 3 秒。您的 Lambda 运行了 3 秒，然后被终止。尝试将 Lambda 配置为运行更长时间。此外，您想对输出文件做什么 - 将其保存在 Lambda 计算机上？