How Datadog Revealed Hidden AWS Performance Problems | HackerNoon

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Migrating from Convox to Nomad and some AWS performance issues we encountered along the way thanks to Datadog - cc: hackernoon lob_dev datadoghq dataanalytics dataengineering

as our deployment platform, a “roll your own Platform-as-a-Service” that you can install to handle container orchestration on AWS’s ECS .NomadAs we prepared our migration to Nomad, our biggest concern was performance. We started our tests with a barebones proof-of-concept setup of our API in Nomad. We benchmarked and compared the two systems and found Nomad was running slower.

To determine if the problem was in our code or the infrastructure we needed to isolate the suspect code and configure Datadog to effectively trace interactions between our app and the infrastructure. Let’s zoom out for a minute and discuss how Amazon services share information with each other. All AWS API requests have to be signed with credentials that tie back to an IAM Role with specific permissions, like uploading objects to our AWS S3 bucket for example.

So, why are the calls to the EC2 metadata service failing, yet somehow still succeeding in the end? After hours of tearing through all the JavaScript AWS SDK documentation and finding nothing, we turned to Google.

 

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