Firestore snapshot listener
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Kane Kim
May 1, 2020, 2:41:52 PM5/1/20
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If document is partially updated what is sent over the network?
Is the whole document sent or only updated fields?
Should we try to keep updates smaller or it doesn't matter for listeners?
Thanks.
Kato Richardson
May 4, 2020, 2:23:48 PM5/4/20
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Hi Kane,
When using a listener, deltas are sent.
For performance, if you are writing fairly big docs, then smaller would be better. For fairly small byte counts, it probably doesn't matter much. For pricing, you pay by the read/write and for bandwidth, so it would take some optimizing for your app's characteristics to find the optimal route.
☼, Kato
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Kane Kim
May 4, 2020, 9:46:12 PM5/4/20
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Got it. Thanks!
On Monday, May 4, 2020 at 11:23:48 AM UTC-7, Kato Richardson wrote:
Hi Kane,When using a listener, deltas are sent.For performance, if you are writing fairly big docs, then smaller would be better. For fairly small byte counts, it probably doesn't matter much. For pricing, you pay by the read/write and for bandwidth, so it would take some optimizing for your app's characteristics to find the optimal route.☼, Kato
On Fri, May 1, 2020 at 11:41 AM Kane Kim <kane....@gmail.com> wrote:
--If document is partially updated what is sent over the network?Is the whole document sent or only updated fields?Should we try to keep updates smaller or it doesn't matter for listeners?Thanks.
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Kato Richardson
May 5, 2020, 12:41:46 PM5/5/20
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Hm, a clarification since I didn't read your question closely enough. When I said "deltas are sent" I was referring to listening on a collection (not a doc). In that case, only changed docs are sent. I don't think that when listening on a doc we do any sort of deltas; we just send the entire doc. The rest of my reply is still accurate.
☼, Kato
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Kane Kim
May 5, 2020, 4:16:12 PM5/5/20
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Ah, makes sense now, I was under assumption that only partial doc would be sent (delta within the document). Thanks for the clarification.
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