Tuning Elasticsearch Index Settings for Logs
Indexing logs in Elasticsearch is resource intensive, and a poorly configured log configuration can make for brutally slow log queries. There are surprisingly few guides on how to address the...
OkHttp 4 Goes Kotlin
Today’s release changes everything and nothing. Everything? OkHttp is an HTTP client for Java and Android. Until today the library itself was all Java. With version 4 we’ve switched to...
OkHttp 3.13 Requires Android 5+
Today we’re releasing OkHttp 3.13. With this update we’re bumping the project’s requirements from this: Android 2.3+ / API 9+ (released December 2010) Java 7+ (released July 2011) to this:...
Announcing SQLDelight 1.0
SQLDelight started as a project 4 years ago on the ContentValues and SQLiteOpenHelper APIs from Android with the goal of making writing SQL easy and safe. The library was an...
Operating Vitess
It has been quite the challenge bringing Vitess online over our existing MySQL database, then sharding and operating it at greater scale over time. Individuals love using the Cash App,...
KotlinPoet 1.0 is here!
KotlinPoet is a collection of Kotlin API that makes generating .kt files easy. It’s inspired by JavaPoet, a Java code generation library, which powers a number of widely used frameworks, such...
Shard Splits with Consistent Snapshots
At Square, we have a lot of data being inserted into our databases. To make it possible for MySQL to handle the load, we shard the data using Vitess. Because...
Cross-Shard Queries & Lookup Tables
Sharding Cash’s database with Vitess was a massive undertaking that set us up for the future, but it was just the start of the journey. The sheer rate of growth...
Abstracting Sharding with Vitess and Distributed Deadlocks
One of the main reasons Vitess was such a success for Cash App is that it abstracts database sharding away from the application code. This allowed us to shard our...
Remodeling Cash App Payments
Before we could partition our database we needed to prepare our data model. Here’s how we turned a simple normalized data model into one that could be partitioned for scale....
Sharding Cash
As we approach the end of 2018, we’re celebrating the anniversary of the first shard split for Cash App with a series of blog posts explaining how we used Vitess...
Announcing Okio 2
At Square, we’re excited about Kotlin. It’s a capable language to build Java libraries and applications with. We love to write code that is both compact and efficient.