There was talk about supporting it, but the priority is getting out the shuffle/reduce steps first.
appengine-mapreduce is an open source project. You can probably just edit/subclass DatastoreInputFormat.java and add the filter functionality: http://www.google.com/codesearch/p?hl=en#XwsseYUY0Ps/trunk/java/src/com/google/appengine/tools/mapreduce/DatastoreInputFormat.java&q=Query%20package:http://appengine-mapreduce%5C.googlecode%5C.com&sa=N&cd=10&ct=rc -- Ikai Lan Developer Programs Engineer, Google App Engine Blogger: http://googleappengine.blogspot.com Reddit: http://www.reddit.com/r/appengine Twitter: http://twitter.com/app_engine On Mon, Nov 8, 2010 at 12:28 PM, Brad <[email protected]> wrote: > Ikai, > > Are there any plans to support filter functionality in the future? I > have a similar situation where I want to iterate over a collection > that is big enough to be used by the mapper framework, but much > smaller than the actual collection size of all entities of that kind. > > Brad > > On Nov 8, 11:56 am, "Ikai Lan (Google)" > <[email protected]<ikai.l%[email protected]> > > > wrote: > > No, the mapper will go over everything. If the number of entities is > small, > > you are better off placing an indexed property on ONLY these fields, then > > just iterating over them with a cursor and either a local client making > > multiple HTTP calls to your App Engine app or chained task queues. > > > > -- > > Ikai Lan > > Developer Programs Engineer, Google App Engine > > Blogger:http://googleappengine.blogspot.com > > Reddit:http://www.reddit.com/r/appengine > > Twitter:http://twitter.com/app_engine > > > > On Sun, Nov 7, 2010 at 5:58 AM, aswath satrasala < > [email protected] > > > > > > > > > wrote: > > > Hello, > > > I want to perform few aggregations on entities of a kind that are > filtered > > > by the property. > > > The entities I want to perform the aggregation is small compared to the > > > complete entity set. > > > Is there any way to pass the filters to the mapper, so that only those > > > entities are retrieved and aggregation is performed > > > > > *Regards > > > -Aswath > > >http://vs-accounting.appspot.com > > > Accounting for Indian markets.* > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "Google App Engine for Java" group. > > > To post to this group, send email to > > > [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]<google-appengine-java%[email protected]><google-appengine-java%2B > [email protected]> > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/google-appengine-java?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" 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-java?hl=en.
