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DAX in front of Dynamo does not reply with ResponseMetadata

0

I have been working on an application that uses Dynamo DB. In places I need to verify the success of a query, and so have been using the response from Dynamo that includes the ResponseMetadata to determine if it was a success. I have now started putting DAX in front of these queries, but because of the lack of ResponseMetadata my existing code assumes the query failed. It's quite frustrating because DAX has to be in a VPC which means I my local uses Dynamo directly and I have to deploy new code to see what happens with DAX.

Can I configure DAX to return a response? Can I configure DAX to work locally?

Thanks!

Topics
Database
Tags
Amazon DynamoDB Accelerator (DAX)Amazon DynamoDB
Language
English
Simon
asked a year ago280 views
1 Answer
1

Unfortunately DAX is a VPC only service, you would be unable to connect to it locally with ease. Can you share with me which ResponseMetadata you are dependent on, I can raise a feature request with the DAX team internally to expose the metadata in the response.

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EXPERT
Leeroy Hannigan
answered a year ago
  • Simon
    a year ago

    Thanks Leeroy!

    I am checking that the HTTPStatusCode returns as 200

    If I use return_values=all_old, it does return the old values - but I don't think I can surmise that having old values means that it was deleted, nor if there is an empty all_new.

  • Simon
    a year ago

    Creation also only allows all_old but then returns nothing because it's all new. This all seems a bit odd.

  • Leeroy Hannigan EXPERT
    a year ago

    DAX would throw an exception if the response was a non 200, which you would catch in your try/catch. Allowing all_old is incase you overwrite an item and want to know its values, you already know the new values as thats what you are currently writing.

    In DynamoDB you will only get a 200 if the item is persisted to at least 2/3 storage nodes, which means items are always durable when you receive a 200 response.

  • Simon
    a year ago

    Thanks Leeroy! I will bare that in mind and adjust accordingly :)

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