As part of our commitment to security and support, we periodically upgrade the stack image, so that we can install updated package versions, address security vulnerabilities, and add new packages to the stack. Recently we had an incident during which some applications running on the Cedar-14 stack image experienced higher than normal rates of segmentation faults and other “hard” crashes for about five hours. Our engineers tracked down the cause of the error to corrupted dyno filesystems caused by a failed stack upgrade. The sequence of events leading up to this failure, and the technical details of the failure, are unique, and worth exploring.

Background

Heroku runs application...


Today we’re happy to announce that the Sydney, Australia region is now generally available for use with Heroku Private Spaces. Sydney joins Virginia, Oregon, Frankfurt, and Tokyo as regions where Private Spaces can be created by any Heroku Enterprise user. Developers can now deploy Heroku apps closer to customers in the Asia-Pacific area to reduce latency and take advantage of the advanced network & trust controls of Spaces to ensure sensitive data stays protected.

Usage

To create a Private Space in Sydney, select the Spaces tab in Heroku Dashboard in Heroku Enterprise, then click the “New Space” button and choose “Sydney, Australia” from the the Space Region dropdown.

After a...


We’re excited to announce that Heroku Autoscaling is now generally available for apps using web dynos.

We’ve always made it seamless and simple to scale apps on Heroku - just move the slider. But we want to go further, and help you in the face of unexpected demand spikes or intermittent activity. Part of our core mission is delivering a first-class operational experience that provides proactive notifications, guidance, and—where appropriate—automated responses to particular application events. Today we take another big step forward in that mission with the introduction of Autoscaling.

Autoscaling makes it effortless to meet demand by horizontally scaling your web dynos based on what’s...


At Heroku, we're always working towards improving operational stability with the services we offer. As we recently launched Apache Kafka on Heroku, we've been increasingly focused on hardening Apache Kafka, as well as our automation around it. This particular improvement in stability concerns Kafka's compacted topics, which we haven't talked about before. Compacted topics are a powerful and important feature of Kafka, and as of 0.9, provide the capabilities supporting a number of important features.

Meet the Bug

The bug we had been seeing is that an internal thread that's used by Kafka to implement compacted topics (which we'll explain more of shortly) can die in...


As we begin 2017, we want to thank you for supporting Heroku. Your creativity and innovation continues to inspire us, and pushed us to deliver even more new products and features in 2016. We especially want to thank everyone who helped us by beta testing, sharing Heroku with others, and providing feedback. Here are the highlights of what became generally available in 2016.

Advancing the Developer Experience

Heroku Pipelines

A new way to structure, manage and visualize continuous delivery.

Heroku Review Apps

Test code at a shareable URL using disposable Heroku apps that spin up with each GitHub pull request.

Free SSL for Apps on Paid Dynos

Get SSL encryption on custom domains for...


Browse the blog archives or subscribe to the full-text feed.