In some initialization work my app needs to run through the all of the
datastore entities of a given kind.  I have a lot of these entities (80k
currently) and it's increasing rapidly. I'm currently trying to read these
in using a single datastore query, but running up against the default
datastore timeout of 30 seconds.

Is there a good practice for sharding this or otherwise breaking this up so
that I won't hit these deadlines? I was thinking I would do a keyOnly query
and then break up the keys into a number of reasonably sized sub-queries,
but perhaps there is a better approach out there?

Thanks,
Phil

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