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Fix Datastore "count" queries (#1201)

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* Fix Datastore "count" queries

The objectify "count()" method doesn't work for result sets larger than 1000
elements, use the original trick from "count domains" that fetches the keys
and counts them.

* Added an SO link
This commit is contained in:
Michael Muller 2021-06-08 15:23:25 -04:00 • committed by GitHub
parent 3f5ba9cfef
commit dad3fcca9a
1 changed files with 7 additions and 1 deletions
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8
core/src/main/java/google/registry/model/ofy/DatastoreTransactionManager.java
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@ -480,7 +480,13 @@ public class DatastoreTransactionManager implements TransactionManager {
@Override
public long count() {
return buildQuery().count();
// Objectify provides a count() function, but unfortunately that doesn't work if there are
// more than 1000 (the default response page size?) entries in the result set. We also use
// chunkAll() here as it provides a nice performance boost.
//
// There is some information on this issue on SO, see:
// https://stackoverflow.com/questions/751124/how-does-one-get-a-count-of-rows-in-a-datastore-model-in-google-app-engine
return Iterables.size(buildQuery().chunkAll().keys());
}
@Override