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Add a per-room mutex to federationapi when processing transactions (#1810)

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* Add a per-room mutex to federationapi when processing transactions

This has numerous benefits:
 - Prevents us doing lots of state resolutions in busy rooms. Previously, room forks would always result
   in a state resolution being performed immediately, without checking if we were already doing this in
   a different transaction. Now they will queue up, resulting in fewer calls to `/state_ids`, `/g_m_e`, etc.
 - Prevents memory usage from growing too large as a result and potentially OOMing.

And costs:
 - High traffic rooms will be slightly slower due to head-of-line blocking from other servers,
   though this has always been an issue as roomserver has a per-room mutex already.

* Fix unit tests

* Correct mutex lock ordering
This commit is contained in:
Kegsay 2021-03-30 10:01:32 +01:00 • committed by GitHub
parent 0ee1c56ffd
commit f8d3a762c4
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4 changed files with 49 additions and 1 deletions
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4
federationapi/routing/routing.go
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@ -21,6 +21,7 @@ import (
"github.com/matrix-org/dendrite/clientapi/jsonerror"
eduserverAPI "github.com/matrix-org/dendrite/eduserver/api"
federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/httputil"
keyserverAPI "github.com/matrix-org/dendrite/keyserver/api"
roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
@ -92,12 +93,13 @@ func Setup(
v2keysmux.Handle("/query", notaryKeys).Methods(http.MethodPost)
v2keysmux.Handle("/query/{serverName}/{keyID}", notaryKeys).Methods(http.MethodGet)
mu := internal.NewMutexByRoom()
v1fedmux.Handle("/send/{txnID}", httputil.MakeFedAPI(
"federation_send", cfg.Matrix.ServerName, keys, wakeup,
func(httpReq *http.Request, request *gomatrixserverlib.FederationRequest, vars map[string]string) util.JSONResponse {
return Send(
httpReq, request, gomatrixserverlib.TransactionID(vars["txnID"]),
cfg, rsAPI, eduAPI, keyAPI, keys, federation,
cfg, rsAPI, eduAPI, keyAPI, keys, federation, mu,
)
},
)).Methods(http.MethodPut, http.MethodOptions)