I am trying to understand what id_chooser and query_chooser do.
Id_chooser basically uses a instance primary key to determine what
shard the intance should be saved to? My primary keys(globally
unique) are made of up more than one fields. Would that be a problem
with Id_chooser?
How/when would do you query_chooser?
Can you set id_chooser and query_chooser to be None in:
create_session.configure(shards = {blah}, shard_chooser =
shard_chooser, id_chooser = None, query_chooser = None) ?
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