Backend app request timeout exceeded


Request processing timeout expired.

Possible causes:

  • It takes too long to process the request on the data source side.
  • It takes too long to prepare the request to the data source on the DataLens side.

To fix this error:

  • Optimize the data in the source.
  • Reduce the number of complex expressions with nested aggregations.
  • Reduce the number of fields in a dataset.
  • Create calculated fields at the dataset level instead of fields at the chart level.