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authorErik Johnston <erik@matrix.org>2021-03-18 15:52:26 +0000
committerGitHub <noreply@github.com>2021-03-18 15:52:26 +0000
commitdd71eb0f8ab5a6e0d8eda3be8c2d5ff01271d147 (patch)
treefeef9f010e5593a5fc604876c06d75e706f7d364 /synapse/rest/admin
parentEnsure we use a copy of the event content dict before modifying it in seriali... (diff)
downloadsynapse-dd71eb0f8ab5a6e0d8eda3be8c2d5ff01271d147.tar.xz
Make federation catchup send last event from any server. (#9640)
Currently federation catchup will send the last *local* event that we
failed to send to the remote. This can cause issues for large rooms
where lots of servers have sent events while the remote server was down,
as when it comes back up again it'll be flooded with events from various
points in the DAG.

Instead, let's make it so that all the servers send the most recent
events, even if its not theirs. The remote should deduplicate the
events, so there shouldn't be much overhead in doing this.
Alternatively, the servers could only send local events if they were
also extremities and hope that the other server will send the event
over, but that is a bit risky.
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