Category: Technology

Meta Open Source is officially transferring Jest, its open source JavaScript testing framework, to the OpenJS Foundation.  With over 17 million weekly downloads and over 38,000 GitHub stars, Jest is the most used testing framework in the JavaScript ecosystem and is used by companies of all sizes, including Amazon, Google, Microsoft, and Stripe. We believe… Continue reading Meta Open Source is transferring Jest to the OpenJS Foundation

More than 3 billion people around the world rely on our services each month. On mobile, around 57 percent of people on Facebook for Android and 49 percent of those on Facebook for iOS use the app in a language other than English. Delivering the best experience for these people, in their own language, is… Continue reading Language packs: Meta’s mobile localization solution

Building infrastructure that can easily recover from outages, particularly outages involving adjacent infrastructure, too often becomes a murky exploration of nuanced fate-sharing between systems. Untangling dependencies and uncovering side effects of unavailability has historically been time-consuming work. A lack of great tooling built for this, and the rarity of infrastructure outages, makes reasoning about them… Continue reading BellJar: A new framework for testing system recoverability at scale

In Salesforce Einstein, we use Apache Spark to perform parallel computations on large sets of data, in a distributed manner. In this article, we will take a deep dive into how you can optimize your Spark application with partitions. Introduction Today, we often need to process terabytes of data per day to reach conclusions. To do this… Continue reading How to Optimize Your Apache Spark Application with Partitions

In Salesforce Einstein, we use Apache Spark to perform parallel computations on large sets of data, in a distributed manner. In this article, we will take a deep dive into how you can optimize your Spark application with partitions. Introduction Today, we often need to process terabytes of data per day to reach conclusions. To… Continue reading How to Optimize Your Apache Spark Application with Partitions

Over the years, Meta has invested in a number of storage service offerings that cater to different use cases and workload characteristics. Along the way, we’ve aimed to reduce and converge the systems in the storage space. At the same time, having a dedicated solution for critical package workload makes everyone happier. Having this in… Continue reading Delta: A highly available, strongly consistent storage service using chain replication

Since Instagram runs one of the world’s largest deployments of the Django web framework, we have natural interest in finding ways to optimize Python so we can speed up our production application. As part of this effort, we’ve recently open-sourced Cinder, our Python runtime that is a fork of CPython. Cinder includes optimizations like immortal… Continue reading How the Cinder JIT’s function inliner helps us optimize Instagram