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Editorial Team
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Asked: 2026-06-04T12:56:15+00:00

I’m retrieving a batch of items using their keys, with something like this: from

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I’m retrieving a batch of items using their keys, with something like this:

from google.appengine.ext.ndb import model

# …
keys = [model.Key('Card', id, namespace=ns) id in ids]
cards = yield model.get_multi_async(keys)

The result of that in appstats is this:

appstats screenshot

The reverse-waterfall thing seems to be caused by keys being sent one by one in parallel, each in its own RPC.

My question is, is there a way to retrieve multiple objects by keys with a single RPC call? (Assuming that would speed up the overall response time of the app).

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1 Answer

  1. Editorial Team

    Quoting guido response in the thread linked by lecstor.

    You can always try issuing fewer RPCs by passing
    max_entity_groups_per_rpc=N to the get_multi_async() call

    Multiple parallel rpcs should be more efficient than a single multi-key RPC.

    The engineers responsible for the HRD implementation assure me this is more
    efficient than issuing a single multi-key Get RPC

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