Q: Once an hour, 500 error '/_ah/datastore_admin/mapreduce_done' In the request log of Google App Engine (GAE), '/_ah/datastore_admin/mapreduce_done' error appears once an hour.
GAE application request logs
As a possibility of error, I think that job of backup from the Google Datastore remains illegally. However, as you can see in the capture below, there was no job left on the Datastore management screen.
Datastore mgmt
Thanking you for your advice.
