Does RPC object block response until async operations finish?

[keakon lolicon]

Hi Google guys,

I just did a test of async db and memcache operations.

I put or deleted 100 entities and immediately returned.

The async operation call took only 0.01s, the sync one took 0.2s, but both of their total response time in the backend log was over 200ms, and I could also feel the latency was longer than a no-op request.

So I think before the server sending respond to browser, the RPC object will wait its async operations to finish or get error.

Does it mean if I don't care whether the operation is successful (like updating a counter), I can do an async call without waiting it by myself?

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keakon

My blog(Chinese): www.keakon.net

Blog source code: https://bitbucket.org/keakon/doodle/

[Nick Johnson]

Hi Keakon,

Yes, the instance will wait for all pending RPCs to complete before returning the response. Asynchronous RPCs are useful in that they allow you to do other work while the RPC runs.

-Nick Johnson

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Nick Johnson, Developer Programs Engineer, App Engine

[keakon lolicon]

Hi Nick,

Thanks for your explain.

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keakon

My blog(Chinese): www.keakon.net

Blog source code: https://bitbucket.org/keakon/doodle/