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Comment on why we combine the deltas

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This commit is contained in:
Mark Haines 2017-06-27 16:13:08 +01:00
parent e5ff5f23df
commit 589c198ef8
1 changed files with 3 additions and 0 deletions
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src/github.com/matrix-org/dendrite/federationsender/consumers/roomserver.go
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@ -160,6 +160,9 @@ func (s *OutputRoomEvent) processMessage(ore api.OutputRoomEvent, ev gomatrixser
func (s *OutputRoomEvent) joinedHostsAtEvent(
ore api.OutputRoomEvent, ev gomatrixserverlib.Event, oldJoinedHosts []types.JoinedHost,
) ([]gomatrixserverlib.ServerName, error) {
// Combine the delta into a single delta so that the adds and removes can
// cancel each other out. This should reduce the number of times we need
// to fetch a state event from the room server.
combinedAdds, combinedRemoves := combineDeltas(
ore.AddsStateEventIDs, ore.RemovesStateEventIDs,
ore.StateBeforeAddsEventIDs, ore.StateBeforeRemovesEventIDs,