Unable to delete persistent objects from Google App Engine datastore - google-cloud-datastore

Question

I have 2 classes AAA and BBB, where BBB contains a field of AAA type.
When I call makePersistent() on 10 AAA and 10 BBB objects, the datastore ends up with 20 AAA objects and 10 BBB objects. I understand this is normal since GAE's datastore is non-relational.
However, when I try to deletePersistentAll using the following,
pm.newQuery(BBB.class).deletePersistentAll();
pm.newQuery(AAA.class).deletePersistentAll();
All BBB objects get removed as expected, but all 20 AAA objects remain. Is there something I'm missing?

Answer 1

Isolation and Consistency
The datastore's isolation level outside of transactions is closest to READ_COMMITTED.
These tests pass.
PersistenceManager pm = pmfInstance.getPersistenceManager();
// make 10 AAA objects
for (int i = 0; i < 10; i++) {
pm.makePersistent(new AAA());
}
// make 10 BBB objects
for (int i = 0; i < 10; i++) {
pm.makePersistent(new BBB(new AAA()));
}
// make sure we have 20 AAA's
#SuppressWarnings("unchecked")
List<AAA> aaa = (List<AAA>) pm.newQuery(AAA.class).execute();
assertEquals(20, aaa.size());
// make sure we have 10 BBB's
List<BBB> bbb = (List<BBB>) pm.newQuery(BBB.class).execute();
assertEquals(10, bbb.size());
// try to delete
pm.newQuery(BBB.class).deletePersistentAll();
bbb = (List<BBB>) pm.newQuery(BBB.class).execute();
assertEquals(0, bbb.size());
pm.newQuery(AAA.class).deletePersistentAll();
aaa = (List<AAA>) pm.newQuery(AAA.class).execute();
assertEquals(0, aaa.size());
assertEquals(0, bbb.size());