Grand Challenge Status

This page shows the status of components of grand-challenge.org.

Incident history

Reader studies do not load

Started 20 June 2025 16:00
  • Viewers

Incident Summary

A problem with the grand-challenge backend prevents reader study cases to load in common scenarios for some users.

Friday evening: After an initial analysis of the issue it seems that it is contained to only a few users of the platform. However, for those users it seems to be a persistent problem which needs further investigation. Right now, as evident from the application log files, only developers seem to have observed the problem. Therefore, we lowered the severity from major to minor because it does not seem that users are directly affected at this moment.

Monday: We have fully tracked down the issue to a code change that added an alternative way of counting cases in a reader study. The issue affected users for grand-challenge who:

  1. are editors of a reader study,
  2. are readers of that same reader study,
  3. had saved annotations,
  4. and were using regular, non-admin accounts.

We reverted the change which resolved the issue. Reader studies are fully operational again.

Timeline

19 June 2025 14:52Incident started
20 June 2025 16:00Issue identified
20 June 2025 18:00Severity lowered to minor
23 June 2025 15:15Issue resolved

Broken Viewer Sessions

Started 03 June 2025 20:10
  • Viewers

Incident Summary

We experienced a viewer session outage affecting all viewing of items on the platform. This included reader studies, archive items, algorithm-job results, and others.

Timeline

03 June 2025 20:10Incident started
04 June 2025 09:00Issue identified
04 June 2025 11:20Issue resolved

Broken Viewer Sessions

Started 30 November 2024 20:00
  • Viewers

Incident Summary

We experienced a viewer session outage affecting all viewing of items on the platform. This included reader studies, archive items, algorithm-job results, and others.

Timeline

02 December 2024 08:45Incident started
02 December 2024 09:30Issue identified
02 December 2024 10:05Issue Resolved

Execution of algorithms and email sending broken

Started 13 September 2024 02:55
  • Algorithm jobs
  • Challenge evaluations

Incident Summary

We are experiencing issues with our queues. As a result, algorithms currently cannot be queued for execution and emails can't be sent. We are working on fixing the issue.

Timeline

13 September 2024 02:55Incident started
13 September 2024 10:55Issue identified
13 September 2024 13:20Issue resolved

Uploading of images and containers broken

Started 02 July 2024 19:00
  • Image handling

Incident Summary

Image and container uploads currently get stuck in "initializing" state due to an issue in our uploads backend. We are working on resolving the issue.

Timeline

02 July 2024 19:00Incident started
03 July 2024 07:00Issue identified
03 July 2024 10:30Incident resolved