Appengine – Efficiently delete data with MapReduce
The new method: The new (easier) way is to delete data is the builtin datastore-admin.
The traditional mapreduce method: The mapreduce-technique won’t affect the latency of your application, but be careful with your quotas. You can also filter out entities you don’t want to delete in the
svn checkout http://appengine-mapreduce.googlecode.com/svn/trunk/ appengine-mapreduce-read-only
python/src/directory and copy the
mapreducesubdirectory into the root directory of your app engine project.
mapreduce.yamlfile in the root folder of your appengine-project (same folder where your app.yaml is). Edit this file an set your model you want to clear after
default:at the last line of the file.