# Safer migrations of fields using progressive rollouts

DevFeed: [Safer migrations of fields using progressive rollouts](<https://devfeed.tech/articles/safer-migrations-of-fields-using-progressive-rollouts-23500.md>)

Original publisher: [Read original article](<https://www.apollographql.com/blog/safer-migrations-of-fields-using-progressive-rollouts>)

Author: Michael Watson

Published: 2024-04-16T09:21:08Z

Content type: tutorial

Language: en

Sources: [Apollo Blog](<https://devfeed.tech/sources/apollo-blog.md>)

Topics: [migration](<https://devfeed.tech/topics/migration.md>), [Development](<https://devfeed.tech/topics/development.md>), [developer tooling](<https://devfeed.tech/topics/developer-tooling.md>)

Tags: [announcement](<https://devfeed.tech/tags/announcement.md>), [apollo-federation](<https://devfeed.tech/tags/apollo-federation.md>), [external](<https://devfeed.tech/tags/external.md>), [flag](<https://devfeed.tech/tags/flag.md>), [graph](<https://devfeed.tech/tags/graph.md>), [implementation](<https://devfeed.tech/tags/implementation.md>), [migrations](<https://devfeed.tech/tags/migrations.md>), [performance](<https://devfeed.tech/tags/performance.md>), [production](<https://devfeed.tech/tags/production.md>)

## AI overview

This article explains how Apollo Federation 2.7's progressive feature supports safer field migrations between subgraphs. It describes gradually shifting traffic to a new service, updating the rollout percentage through the schema, and using external coprocessors or Rhai scripts to resolve labels for feature-flag-based routing.

## Source excerpt

In the realm of software development, evolution is not just desirable; it's inevitable. Technologies advance, methodologies shift, and systems need to adapt to meet changing demands. In this ever-evolving landscape, Apollo Federation 2.7 introduces a groundbreaking feature: progressive ✨ Rolling out any change to a production subgraph, including field migration, risks degrading the performance of your graph.