I want to purge old entities from the datastore. How I do this at the
moment is having a cron job run a script every 30 seconds. The script
removes entries using deletePersistentAll() via a JDO query object.
Query query = pm.newQuery(Game.class, "lastUpdateTime < ageLimit");
query.declareParameters("long ageLimit");
long numRemovedGames = query.deletePersistentAll(ageLimit);
The datastore contains about 2000 or so objects that should be
removed. However, when I run this the request is killed with a
DeadlineExceededException and no objects are removed. The same issue
will happen again, again and again every time the cron job runs since
no objects are removed.
If I try to use setRange() to limit the number of objects being
removed, it will throw another exception saying I'm not allowed to do
that.
Is the only solution to actually get the objects, and then remove them
one by one?
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