我目前正在研究用Java编写的AWS Lambda函数。它需要从S3获取对象，因此，我设置了IAM角色，并在Lambda的处理程序中构建了S3客户端：
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
public class Example implements RequestHandler<Void, Void> {
@Override
public Void handleRequest(Void nothing, Context ctx) {
long start = System.currentTimeMillis();
AmazonS3 amazonS3 = AmazonS3ClientBuilder.defaultClient();
ctx.getLogger().log("Creating S3 client took " + (System.currentTimeMillis() - start) + "ms");
...
return null;
}
}
但是，由于使用AmazonS3ClientBuilder速度非常慢，因此在向该函数分配192MB时，log语句会打印出以下时序：
Creating S3 client took 13541ms
Creating S3 client took 16482ms
Creating S3 client took 13617ms
Creating S3 client took 16380ms
即使将内存增加到3008MB以获取最大处理能力（AWS为Lambdas分配与内存成正比的CPU能力），获取客户端仍需要1-2秒：
Creating S3 client took 1413ms
Creating S3 client took 1170ms
Creating S3 client took 1528ms
Creating S3 client took 1394ms
这些时间是在冷启动场景中记录的，我正在缓存AmazonS3实例以供后续请求使用，但是在不热的Lambda上构建一个S3客户端可能要花费16秒以上，这似乎非常极端。
我是否滥用了AmazonS3ClientBuilder，可能是由于未覆盖某些默认值而导致性能下降？如何加快客户端初始化？
适用于Java 2.0的AWS开发工具包于11月发布。基本上，这是对1.x版的重写，并且似乎已经改善了很多性能。从问题中迁移代码以使用新的SDK将为我们提供类似于以下内容：
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import software.amazon.awssdk.services.s3.S3Client;
public class Example implements RequestHandler<Void, Void> {
@Override
public Void handleRequest(Void nothing, Context ctx) {
long start = System.currentTimeMillis();
S3Client s3Client= S3Client.create();
ctx.getLogger().log("Creating S3 client took " + (System.currentTimeMillis() - start) + "ms");
...
return null;
}
}
为该功能分配192MB时：
Creating S3 client took 9380ms
Creating S3 client took 9719ms
Creating S3 client took 10098ms
Creating S3 client took 9519ms
为该功能分配3008MB时：
Creating S3 client took 884ms
Creating S3 client took 873ms
Creating S3 client took 886ms
Creating S3 client took 877ms
基于这些粗略的数字，使用SDK版本2时，在冷启动方案中创建S3客户端的时间减少了三分之一以上。
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