Post-mortem: April 19th, 2018
By Robert Beekman on
For the first time in years we lost customer data, here's how it happened.
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Our team handles over 30 billion requests each month. We run a stack with Ruby, MongoDB, Rust, Go, React and are improving this all the time.
By Robert Beekman on
For the first time in years we lost customer data, here's how it happened.
read moreBy Jeff Kreeftmeijer on
Rails' cache stores can store the data in memory, Memcached, Redis, or even straight to disk. But which of the different cache stores is best for which situation?
read moreBy Robert Beekman on
We've upgraded our GitHub integration to a new GitHub App.
read moreBy Jeff Kreeftmeijer on
A raised exception can be rescued to prevent it from crashing your application once it reaches to top of the call stack. In this article, we'll examine different ways to rescue exceptions.
read moreBy Jeff Kreeftmeijer on
By nesting cache fragments, views are almost never rendered completely. Even when the data changes, most of the rendered pages are served straight from the cache.
read moreBy Jeff Kreeftmeijer on
The load average tells you the load your system has been under. In this article, we'll discuss how it's calculated, how to read the returned values, and when to be alarmed.
read moreBy Jeff Kreeftmeijer on
Rails' built-in fragment caching is used to store pre-rendered view fragments, so they don't need to be rendered again unless their contents need to change.
read moreBy Jeff Kreeftmeijer on
An exception is a signal that's sent when the program doesn't know how to deal with a specific situation. In this introduction, we'll explain what exceptions are, and how to raise one, and how to rescue your app from crashes caused by exceptions.
read moreBy Jeff Kreeftmeijer on
When using a tool like top or checking your app's CPU usage in AppSignal's host metrics, the metrics are divided into multiple categories. What's the difference between "system", "user", "nice", "iowait" and "idle" CPU time?
read moreBy Jeff Kreeftmeijer on
When working on an important piece of code in your codebase, running benchmarks to compare different implementations can give more insight into their execution speeds.
read moreBy Jeff Kreeftmeijer on
Most exceptions are caused by unexpected data being passed to methods that work fine otherwise, so it's often useful to trace a piece of data through your application to find the cause of an error.
read moreBy Tom de Bruijn on
Ever hear about Ruby's syntactic sugar, but never knew what it meant or how to use it? In this article we'll explore just how we can use it to our advantage.
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