What is the Concurrent Request Limit on Google App Engine Instances?

Understanding Concurrent Request Limits on Google App Engine Instances

Introduction

The notion of a concurrent request limit on Google App Engine (GAE) instances has been a topic of discussion, with many sources suggesting a hard limit of 10 concurrent requests. To delve into the technicalities of this concept, we present an exploration of what this limit entails.

Concurrent Request Handling

The 10-concurrent-request limit is enforced through a restriction on the number of concurrent threads on all GAE runtimes, including Go, Python, and Java. In most instances, when this threshold is reached, the GAE scheduler initiates the creation of a new instance to handle the excess load.

Implications for Go Instances

The 10-concurrent-request limit affects Go instances in the same way that it does instances running other languages. While earlier versions of Go had a different mechanism for handling concurrency, this has since been standardized across all languages on GAE.

Future Enhancements and Community Involvement

It's worth noting that there is an ongoing feature request to allow App Engine instances to handle more than 10 concurrent requests. Individuals interested in this enhancement can contribute by supporting the request here: Allow configurable limit of concurrent requests per instance.

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