May 13, 2014

Grails R14 Error (Memory quota exceeded) on Heroku

I have frequently encountered the following Error R14 (Memory quota exceeded) in the logs while running Grails apps on Heroku on the 1x Dyno which only allows 512mb of RAM:

2014-05-08T04:46:48.294887+00:00 heroku[web.1]: Process running mem=557M(108.9%)
2014-05-08T04:46:48.295268+00:00 heroku[web.1]: Error R14 (Memory quota exceeded)

To debug the issue and to be sure I was not having an application specific error, I created a new Grails application and followed the “Getting Started with Grails on Heroku” tutorial, but I still was getting the R14 error with a new application. To debug how much memory was being used, I used the Application Info plugin and ran the new application on Heroku. The source for this application can be found on Github.

I tried to run the same build and server process as Heroku locally but found about a 100mb difference in memory usage. The only difference I had locally was using JDK7. So, I configured the project to use JDK7 on Heroku by add adding a “” file to the project with the JDK configuration as described in the Heroku Grails tutorial:

After starting up with the new JDK, I no longer say the Error R14 in the logs.

Using JDK7 on Heroku, the Grails application used much less memory on startup (454 vs 582 mb) and under load (496 vs 643 mb) using Apache Bench.

About the Author

Object Partners profile.

One thought on “Grails R14 Error (Memory quota exceeded) on Heroku

  1. jogee says:

    Greaatt!! Thanks man!

  2. Jean says:

    Thanks a lot, man. I had the same problem and was easilly solve by your solution.

  3. Geert Jonker says:

    Thanks, helped me a lot. My 2X Dyno with Grails app went from 1024MB to 624MB.
    Still, my Java Heap is only 364Mb, I’m wondering where all the other Mb’s are going to…

  4. Klemens says:

    In my case, changing from Tomcat to Jetty seemed to help with the memory issue. So the system property looks like this:


  5. I had to switch to Java 8 (java.runtime.version=1.8) to resolve this problem in my Grails app.

Leave a Reply

Your email address will not be published. Required fields are marked *

Related Blog Posts
AWS Cloud HSM, Docker and NGINX
There is quite a bit of easily searchable content on the security benefits of leveraging a Hardware Security Module to manage cryptographic keys, so I will leave that to the scope of another article. The […]
Google Professional Machine Learning Engineer Exam 2021
Exam Description A Professional Machine Learning Engineer designs, builds, and productionizes ML models to solve business challenges using Google Cloud technologies and knowledge of proven ML models and techniques. The ML Engineer is proficient in all aspects […]
Designing Kubernetes Controllers
There has been some excellent online discussion lately around Kubernetes controllers, highlighted by an excellent Speakerdeck presentation assembled by Tim Hockin. What I’d like to do in this post is explore some of the implications […]
React Server Components
The React Team recently announced new work they are doing on React Server Components, a new way of rendering React components. The goal is to create smaller bundle sizes, speed up render time, and prevent […]