you MUST have a look at
http://ikaisays.com/2010/07/09/using-the-java-mapper-framework-for-app-engine/
There's a special section at the end of the post delete all entities
of a given kind.
You can delete 35M entities in a few minutes using mapreduce.
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Can use low-level datastore and iterate over batches:
binSize = 1000;// or smaller if needed 30 sec timeout
DatastoreService datastore =
DatastoreServiceFactory.getDatastoreService();
Keys only select and delete:
javax.jdo.Query q = pm.newQuery(select key from +
If you don't want to introduce MapReduce solely for this purpose, you
can write a queued task that loops through the data to delete it
and that recreates a new instance of itself just before time limit (10
min) to continue the deletion.
regards
didier
On Sep 9, 8:37 pm, Marcelo Liberato
