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Comment about a better future where we can get the state diff between two events (#13586)

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Split off from https://github.com/matrix-org/synapse/pull/13561

Part of https://github.com/matrix-org/synapse/issues/13356

Mentioned in [internal doc](https://docs.google.com/document/d/1lvUoVfYUiy6UaHB6Rb4HicjaJAU40-APue9Q4vzuW3c/edit#bookmark=id.2tvwz3yhcafh)
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Eric Eastwood 2022-08-24 18:59:27 -05:00 committed by GitHub
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changelog.d/13586.misc Normal file
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@ -0,0 +1 @@
Comment about a better future where we can get the state diff between two events.

8
synapse/handlers/federation_event.py
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@ -1041,6 +1041,14 @@ class FederationEventHandler:
InvalidResponseError: if the remote homeserver's response contains fields
of the wrong type.
"""
# It would be better if we could query the difference from our known
# state to the given `event_id` so the sending server doesn't have to
# send as much and we don't have to process as many events. For example
# in a room like #matrix:matrix.org, we get 200k events (77k state_events, 122k
# auth_events) from this call.
#
# Tracked by https://github.com/matrix-org/synapse/issues/13618
(
state_event_ids,
auth_event_ids,