I am new to AWS S3 SDK and need guidance on using S3Waiter.waitUntilObjectExists() I could not find any exact examples. I have a S3 bucket in which every four hours files uploaded by upstream processes. I have while(true) loop which polls for this bucket but it seems to be unnecessary and doing lot of IOs.
I read about S3Waiter.waitUntilObjectExists() and it seems to be applicable and best practices kind of solution in my case.
The examples for Amazon S3 V2 API are located in the AWS Doc Github repo. You will find the latest Java V2 examples that are tested via Unit tests, etc in Github:
https://github.com/awsdocs/aws-doc-sdk-examples/tree/master/javav2/example_code/s3/src/main/java/com/example/s3
For example, if you want to learn how to use waiters when you create a bucket, see this example:
https://github.com/awsdocs/aws-doc-sdk-examples/blob/master/javav2/example_code/s3/src/main/java/com/example/s3/CreateBucket.java
This concept is also explained in the AWS SDK for Java 2.x Developer guide:
Using waiters
And yes, using waiters is best practice vs looping and polling.
Related
We're new to Amazon Seller Partner-API. Need to invoke certain Amazon SP-APIs for an integration workflow. For some internal reasons, using Amazon SDKs is a secondary option. With our conventional approach, we're able to interact with most APIs, in this case the AWS Request signing & Signature generation is where we're stuck.
As per Amazon using SDK handles it all internally. Is it possible to use a command line utility like - AWS CLI to interact with SP-APIs? Not sure if this is feasible. Found this - amazon-sp-api but not sure if it is stable / reliable.
I believe there should be ways to interact with SP-API from command line. If not, atleast there should be a tool that is able to produce AWS Request signature (given the request info, key etc...).
Kindly share your experience and expertise. We're new to AWS, so if I'm confusing AWS with SP-API (esp for Request signing - I believe both use the same mechanism) pls point it out.
The link you shared to amz.tools does not look like a command line interface. It is just an SDK generated in NodeJS. There is not way to connect to the API via command line. You can use Postman if you want to avoid SDKs.
And yes, AWS is not the same thing as SP API.
You can search github for SDKs generated on other languages; some seem to have a lot of use.
We generated our own SDK in C# because others didn't fit out criteria.
I have a file in s3 bucket say like s3://prefix/file1 with size 2G
I tried to copy it to s3://prefix/file2
The CLI I used is aws s3 cp s3://prefix/file1 s3://prefix/file2
The sdk usage is amazonS3.copyObject("prefix","file1","prefix", "file2")
CLI method took ~15s while sdk method took ~30s.
Try to use the TransferManager, like in this "old" blog post of AWS:
https://aws.amazon.com/de/blogs/developer/using-transfer-manager-to-copy-amazon-s3-objects/
I'm not very familiar with JAVA programming, but in several applications I've been involved in migrating/optimizing, switching from the "normal" SDK methods to operations using TransferManager with Java has sometimes helped improve performance.
Maybe this could also improve the performance for you.
Ours is a Spring-Boot based application. For integration with AWS SNS and SQS, we have couple of options:
Use Spring-Cloud-AWS
Use AWS-SDK-Java 2
I wanted to know if there is any advantage in using one or the other.
When I ask AWS guys, they tell me that AWS SDK gets updated regularly and integration with SNS and SQS is not difficult. Hence, there is no need to integrate with Spring-Cloud-AWS.
I tried searching on gitter channel for Spring-Cloud and could not find any relevant information. Documentation does state that I can update the AWS-SDK version. Documentation does not state any compelling reason for not using AWS-SDK directly.
If anyone has some insights, please share.
From the AWS Spring Team:
"From now on, our efforts focus on 3.0 - based on AWS SDK 2.0."
So, if you need AWS SDK 2.0, you probably want to go directly with the SDK.
https://spring.io/blog/2021/03/17/spring-cloud-aws-2-3-is-now-available
For more on what's new on AWS Java SDK 2.0:
https://aws.amazon.com/blogs/developer/aws-sdk-for-java-2-0-developer-preview/
The main advantage over the AWS Java SDK is the Spring style convenience and head start we get by using the Spring project. As per the project documentation (https://cloud.spring.io/spring-cloud-aws/reference/html/##using-amazon-web-services)
Using the SDK, application developers still have to integrate the SDK
into their application with a considerable amount of infrastructure
related code. Spring Cloud AWS provides application developers already
integrated Spring-based modules to consume services and avoid
infrastructure related code as much as possible.
Are there any mocks for AWS SWF or EMR available anywhere? I tried looking at some other AWS API mocks such as https://github.com/atlassian/localstack/ or https://github.com/treelogic-swe/aws-mock but they don't have SWF or EMR which are the things that would be really painful to reproduce. Just not sure if anyone has heard of a way to locally test things that use dependencies on those services.
The "moto" project (https://github.com/spulec/moto) groups mocks for the "boto" library (the official python sdk for AWS), and it has mocks for basic things in SWF (disclaimer: I'm the author who contributed them) and EMR.
If you happen to work in Python they're ready to use via a #mock_swf decorator (use 0.4.x for boto 2.x or 1.x for boto 3.x). If you work with another language, moto supports a server mode that mimics an AWS endpoint. The SWF service is not provided out of the box yet, but with a minor change in "moto/backends.py" you should be able to try using it. I think the EMR service works out of the box.
Should you have any issue with the SWF mocks in this project, you can file an issue on the Github project, don't hesitate to cc me directly (#jbbarth), I can probably help improving this.
I'm quite interested in beginning some development using Amazon SQS, perhaps SimpleDB too, my question is this, are there any open source solutions that mimic the functionality, just for the purposes of development. I've already encountered the Eucalyptus project (http://open.eucalyptus.com) for creating an EC-esque cloud.
I've not had any success with google, I suspect it's because the cost of entry is so inexpensive, but still, does anyone know of anything like this?
For SQS I wrote ElasticMQ, which you can run either embedded (it's written in Scala, so runs on the JVM) or stand-alone. It has both persistent and in-memory modes, the first being good for dev, second for testing.
If you need a test double for more than just SQS, you can try LocalStack.
To simulate SQS, it internally uses ElasticMQ mentioned by adamw.
You can start LocalStack via Docker, for example, and it will start the following services:
API Gateway at http://localhost:4567
Kinesis at http://localhost:4568
DynamoDB at http://localhost:4569
DynamoDB Streams at http://localhost:4570
Elasticsearch at http://localhost:4571
S3 at http://localhost:4572
Firehose at http://localhost:4573
Lambda at http://localhost:4574
SNS at http://localhost:4575
SQS at http://localhost:4576
Redshift at http://localhost:4577
ES (Elasticsearch Service) at http://localhost:4578
SES at http://localhost:4579
Route53 at http://localhost:4580
CloudFormation at http://localhost:4581
CloudWatch at http://localhost:4582
SSM at http://localhost:4583
Some of the Amazon SDKs have "mock" mode, which is:
The mock service is an alternate way
to use the sample code. The service
doesn't call AWS, but instead returns
a set response that you can modify to
suit your needs (the XML response
files are in the Mock directory). The
mock service makes it easy for you to
test how your application handles
different responses.
For SQS, it appears the Perl and PHP SDKs have mock mode. I know that the .NET SDK for Amazon RDS also has the mock mode.
The Java SDK doesn't contain mock implementations:
The client mock implementations have been removed. Instead, developers
are encouraged to use more flexible and full featured mock libraries,
such as EasyMock, jMock
If the SDK you will be using doesn't have the mock mode available, you could probably create your own similar type of thing which returns the preconfigured responses instead of actually hitting up the service.
See here for more info
GoAws - https://github.com/p4tin/goaws - was just released as beta. (disclaimer - I am the developer).
Regarding the Java SDK, it does no longer contain mock implementations:
The client mock implementations have been removed. Instead, developers
are encouraged to use more flexible and full featured mock libraries,
such as EasyMock, jMock
If you are in .NET or Mono you can try Stratosphere. It has local implementations that mimic SimpleDB, SQS and S3. For SimpleDB mock implementation it uses SQLite, for SQS and S3 it stores messages/objects in file system.
if you need to simulate SNS as well as SQS you can check out: Yopa