Ok, thanks.
So it seems for MapReduce for App Engine to work optimally, I would
need to manually add the requested index (and then, somewhat
ironically, use MapReduce for App Engine to walk the entire data set
and put each entity to get the new index populated).
j
On Jun 8, 5:19 pm, Alkis Evlogimenos ('Αλκης Ευλογημένος)
<[email protected]> wrote:
> There is no desc index on __key__. Each indexed property has an asc and desc
> index on it but that doesn't apply for keys.
>
> - alkis
>
>
>
> On Wed, Jun 9, 2010 at 12:39 AM, Jason C <[email protected]> wrote:
> > 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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