I'm attempting to use mapreduce for app engine as presented at I/O
2010.
I just noticed the following warning message in our logs (on /
mapreduce/command/start_job):
Cannot create accurate approximation of keyspace, guessing instead.
Please address this problem: no matching index found.
This query needs this index:
- kind: AccountKeyword
properties:
- name: __key__
direction: desc
This seems to suggest that there is no (desc) index for the key of our
Model. However, isn't this created automatically? Indeed, I can't even
think of a way to _not_ have it created (i.e., I can't think of a way
to specify indexed=False for the key).
Is this an error in reporting, or is something very wrong with our
Datastore?
Thanks,
j
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