What is TombstonedTaskError from App Engine's Task Queue?
google-app-engine, task-queue
Solution
You've added a task with that exact name before. Although it's already run, executed task names are kept around for some time to prevent accidental duplicates. If you're assigning task names, you should be using ones that are globally unique to prevent this occurring.
Problem
What does the `TombstonedTaskError` mean? It is being raised while trying to add a task to the queue, from a cron-job: ``` Traceback (most recent call last): File "/base/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 501, in __call__ handler.get(*groups) File "/base/data/home/apps/.../tasks.py", line 132, in get ).add(queue_name = 'userfeedcheck') File "/base/python_lib/versions/1/google/appengine/api/labs/taskqueue/taskqueue.py", line 495, in add return Queue(queue_name).add(self) File "/base/python_lib/versions/1/google/appengine/api/labs/taskqueue/taskqueue.py", line 563, in add self.__TranslateError(e) File "/base/python_lib/versions/1/google/appengine/api/labs/taskqueue/taskqueue.py", line 619, in __TranslateError raise TombstonedTaskError(error.error_detail) TombstonedTaskError ``` Searching the documentation only has the following to say: ``` exception TombstonedTaskError(InvalidTaskError) Task has been tombstoned. ``` ..which isn't particularly helpful. I couldn't find anything useful in the App Engine code either..