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Metadata in DynamoDB stream event for delete operation?


Metadata in DynamoDB stream event for delete operation?

By : user2172465
Date : October 23 2020, 08:10 PM
I wish this helpful for you Here are 3 different options. The right one will depend on the requirements of your application. It could be that none of these will work in your specific use case, but in general, these approaches will all work.
Option 1
code :
handle_event(operation, item, user)
    log(operation, item, user)
    switch operation
        case put:
             dynamodb.put(item)
        case update:
             dynamodb.update(item)
        case delete:
             dynamodb.delete(item)

log(operation, item, user)
    logEntry.time = now
    logEntry.user = user
    ...
    print(logEntry)


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How to post event with metadata to stream through HTTP API

How to post event with metadata to stream through HTTP API


By : user6817030
Date : March 29 2020, 07:55 AM
wish of those help The documentation mentions the full schema for an event being written. It looks like this:
code :
[
    {
      "eventId"    : "string",
      "eventType"  : "string",
      "data"       : "object",
      "metadata"   : "object"
    }
]
[
  {
    "eventId": "fbf4a1a1-b4a3-4dfe-a01f-ec52c34e16e4",
    "eventType": "event-type",
    "data": { "a": "1" },
    "metadata": { "b": "2" }
  }
]
Proper way to repeat an operation firing off an event stream

Proper way to repeat an operation firing off an event stream


By : Abbey
Date : March 29 2020, 07:55 AM
wish of those help Please have a look at the test. On every event a new IO-Request will be fired. Switch-Map is like Flat-Map, but it will unsubscribe from the recent subscription, when a new upstream-event comes in. Flat-Map would just start a new one, if you are working with concurrency. So lets assume your hot observable fired an event and the flatMap start executing your IO work on another thread (subscribeOn). If another event comes in, while the last one is still executing, it will start executing another IO-task. Switch-Map will unsubscribe from the last one and start one for the current event. Lets have a look at the retry()-operator. Retry will just re-subscribe to the observable provided by 'ioWorkWrapped' until the observable finishes with onComplete. This is probably very dangerous, because imagine it will fail on every try. It would spin forever. It is recommended to use 'exponential-backoff' and provide a back-up observable fails after X tries. For the usage of 'retryWhen' please have a look at this excellent book: Reactive Programming with RxJava
code :
public class LibraryTest {
    private AtomicInteger idx;

    @Before
    public void setUp() throws Exception {
        idx = new AtomicInteger(0);
    }

    @Test
    public void name() throws Exception {
        Observable<String> stringObservable = Observable.just(1)
                .switchMap(integer -> ioWorkWrapped()
                        .doOnError(throwable -> System.out.println("Something went wrong."))
                        .retry()
                );

        stringObservable.test()
                .await()
                .assertResult("value");


    }

    private Observable<String> ioWorkWrapped() {
        return Observable.defer(() -> {
            try {
                Thread.sleep(500); // IO Work
                if (idx.getAndIncrement() < 5) { // for testing...
                    return Observable.error(new IllegalStateException("Wurst"));
                }
                return Observable.just("value");
            } catch (Exception ex) {
                return Observable.error(ex);
            }
        });
    }
}
Configure dynamoDb stream to invoke lambda function only on delete

Configure dynamoDb stream to invoke lambda function only on delete


By : laron
Date : March 29 2020, 07:55 AM
With these it helps There is no such options as far as I know. DynamoDB updates its stream data whenever any item is created, modified and deleted. Any change in the stream invokes the lambda function. You can check for "eventName" value as "REMOVE" in the event from dynamodb and only process that event.
cannot delete a stream because Package Metadata in Repository say not all releases DELETED

cannot delete a stream because Package Metadata in Repository say not all releases DELETED


By : kelsiko
Date : March 29 2020, 07:55 AM
hope this fix your issue i ended up recreating my Docker/K8s environment and that fixed the problem
How can I reference to DynamoDB stream as Lambda function trigger event in the serverless.yml?

How can I reference to DynamoDB stream as Lambda function trigger event in the serverless.yml?


By : user3172433
Date : March 29 2020, 07:55 AM
will be helpful for those in need I am using Serverless framework for deployment of my AWS Lambda functions. I have a serverless.yml file which declares all of my resources and functions. , You can use AWS CloudFormation intrinsic functions like this:
code :
events:
  - stream:
      type: dynamodb
      arn:
        Fn::GetAtt: [ MyTable, StreamArn ]
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