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Add a per-room mutex to federationapi when processing transactions (#1810)
* 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
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@ -21,6 +21,7 @@ import (
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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eduserverAPI "github.com/matrix-org/dendrite/eduserver/api"
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federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/internal/httputil"
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keyserverAPI "github.com/matrix-org/dendrite/keyserver/api"
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roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
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@ -92,12 +93,13 @@ func Setup(
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v2keysmux.Handle("/query", notaryKeys).Methods(http.MethodPost)
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v2keysmux.Handle("/query/{serverName}/{keyID}", notaryKeys).Methods(http.MethodGet)
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mu := internal.NewMutexByRoom()
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v1fedmux.Handle("/send/{txnID}", httputil.MakeFedAPI(
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"federation_send", cfg.Matrix.ServerName, keys, wakeup,
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func(httpReq *http.Request, request *gomatrixserverlib.FederationRequest, vars map[string]string) util.JSONResponse {
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return Send(
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httpReq, request, gomatrixserverlib.TransactionID(vars["txnID"]),
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cfg, rsAPI, eduAPI, keyAPI, keys, federation,
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cfg, rsAPI, eduAPI, keyAPI, keys, federation, mu,
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)
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},
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)).Methods(http.MethodPut, http.MethodOptions)
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@ -26,6 +26,7 @@ import (
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"github.com/getsentry/sentry-go"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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eduserverAPI "github.com/matrix-org/dendrite/eduserver/api"
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"github.com/matrix-org/dendrite/internal"
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keyapi "github.com/matrix-org/dendrite/keyserver/api"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/setup/config"
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@ -98,6 +99,7 @@ func Send(
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keyAPI keyapi.KeyInternalAPI,
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keys gomatrixserverlib.JSONVerifier,
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federation *gomatrixserverlib.FederationClient,
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mu *internal.MutexByRoom,
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) util.JSONResponse {
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t := txnReq{
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rsAPI: rsAPI,
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@ -107,6 +109,7 @@ func Send(
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haveEvents: make(map[string]*gomatrixserverlib.HeaderedEvent),
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newEvents: make(map[string]bool),
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keyAPI: keyAPI,
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roomsMu: mu,
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}
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var txnEvents struct {
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@ -163,6 +166,7 @@ type txnReq struct {
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federation txnFederationClient
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servers []gomatrixserverlib.ServerName
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serversMutex sync.RWMutex
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roomsMu *internal.MutexByRoom
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// local cache of events for auth checks, etc - this may include events
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// which the roomserver is unaware of.
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haveEvents map[string]*gomatrixserverlib.HeaderedEvent
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@ -494,6 +498,8 @@ func (t *txnReq) getServers(ctx context.Context, roomID string) []gomatrixserver
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}
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func (t *txnReq) processEvent(ctx context.Context, e *gomatrixserverlib.Event) error {
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t.roomsMu.Lock(e.RoomID())
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defer t.roomsMu.Unlock(e.RoomID())
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logger := util.GetLogger(ctx).WithField("event_id", e.EventID()).WithField("room_id", e.RoomID())
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t.work = "" // reset from previous event
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@ -9,6 +9,7 @@ import (
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"time"
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eduAPI "github.com/matrix-org/dendrite/eduserver/api"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/internal/test"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/gomatrixserverlib"
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@ -370,6 +371,7 @@ func mustCreateTransaction(rsAPI api.RoomserverInternalAPI, fedClient txnFederat
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federation: fedClient,
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haveEvents: make(map[string]*gomatrixserverlib.HeaderedEvent),
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newEvents: make(map[string]bool),
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roomsMu: internal.NewMutexByRoom(),
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}
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t.PDUs = pdus
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t.Origin = testOrigin
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38
internal/mutex.go
Normal file
38
internal/mutex.go
Normal file
@ -0,0 +1,38 @@
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package internal
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import "sync"
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type MutexByRoom struct {
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mu *sync.Mutex // protects the map
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roomToMu map[string]*sync.Mutex
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}
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func NewMutexByRoom() *MutexByRoom {
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return &MutexByRoom{
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mu: &sync.Mutex{},
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roomToMu: make(map[string]*sync.Mutex),
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}
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}
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func (m *MutexByRoom) Lock(roomID string) {
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m.mu.Lock()
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roomMu := m.roomToMu[roomID]
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if roomMu == nil {
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roomMu = &sync.Mutex{}
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}
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m.roomToMu[roomID] = roomMu
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m.mu.Unlock()
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// don't lock inside m.mu else we can deadlock
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roomMu.Lock()
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}
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func (m *MutexByRoom) Unlock(roomID string) {
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m.mu.Lock()
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roomMu := m.roomToMu[roomID]
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if roomMu == nil {
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panic("MutexByRoom: Unlock before Lock")
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}
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m.mu.Unlock()
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roomMu.Unlock()
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}
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