Why do you need to walk your data in __key__ reverse order? - alkis
2010/6/9 Jason C <[email protected]> > 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 > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "Google App Engine" group. > > > To post to this group, send email to [email protected] > . > > > To unsubscribe from this group, send email to > > > [email protected]<google-appengine%[email protected]><google-appengine%2Bunsubscrib > [email protected]> > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/google-appengine?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
