func (s *offerStorage) declineOffer(offerId, hostname string, reason metrics.OfferDeclinedReason) {
//TODO(jdef) might be nice to spec an abort chan here
runtime.Signal(proc.OnError(s.DeclineOffer(offerId), func(err error) {
log.Warningf("decline failed for offer id %v: %v", offerId, err)
}, nil)).Then(func() {
metrics.OffersDeclined.WithLabelValues(hostname, string(reason)).Inc()
})
}
func (k *QingYuanScheduler) InstallDebugHandlers(mux *http.ServeMux) {
wrappedHandler := func(uri string, h http.Handler) {
mux.HandleFunc(uri, func(w http.ResponseWriter, r *http.Request) {
ch := make(chan struct{})
closer := runtime.Closer(ch)
proc.OnError(k.asMaster().Do(func() {
defer closer()
h.ServeHTTP(w, r)
}), func(err error) {
defer closer()
log.Warningf("failed HTTP request for %s: %v", uri, err)
w.WriteHeader(http.StatusServiceUnavailable)
}, k.terminate)
select {
case <-time.After(k.schedcfg.HttpHandlerTimeout.Duration):
log.Warningf("timed out waiting for request to be processed")
w.WriteHeader(http.StatusServiceUnavailable)
return
case <-ch: // noop
}
})
}
requestReconciliation := func(uri string, requestAction func()) {
wrappedHandler(uri, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
requestAction()
w.WriteHeader(http.StatusNoContent)
}))
}
requestReconciliation("/debug/actions/requestExplicit", k.reconciler.RequestExplicit)
requestReconciliation("/debug/actions/requestImplicit", k.reconciler.RequestImplicit)
wrappedHandler("/debug/actions/kamikaze", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
slaves := k.slaves.getSlaveIds()
for _, slaveId := range slaves {
_, err := k.driver.SendFrameworkMessage(
k.executor.ExecutorId,
mutil.NewSlaveID(slaveId),
messages.Kamikaze)
if err != nil {
log.Warningf("failed to send kamikaze message to slave %s: %v", slaveId, err)
} else {
io.WriteString(w, fmt.Sprintf("kamikaze slave %s\n", slaveId))
}
}
io.WriteString(w, "OK")
}))
}
func (self *SchedulerProcess) Elect(newDriver DriverFactory) {
errOnce := proc.NewErrorOnce(self.fin)
proc.OnError(errOnce.Send(standbyStage.Do(self, proc.Action(func() {
if !(&self.stage).transition(standbyStage, masterStage) {
log.Errorf("failed to transition from standby to master stage, aborting")
self.End()
return
}
log.Infoln("scheduler process entered master stage")
drv, err := newDriver()
if err != nil {
log.Errorf("failed to fetch scheduler driver: %v", err)
self.End()
return
}
log.V(1).Infoln("starting driver...")
stat, err := drv.Start()
if stat == mesos.Status_DRIVER_RUNNING && err == nil {
log.Infoln("driver started successfully and is running")
close(self.elected)
go func() {
defer self.End()
_, err := drv.Join()
if err != nil {
log.Errorf("driver failed with error: %v", err)
}
errOnce.Report(err)
}()
return
}
defer self.End()
if err != nil {
log.Errorf("failed to start scheduler driver: %v", err)
} else {
log.Errorf("expected RUNNING status, not %v", stat)
}
}))).Err(), func(err error) {
defer self.End()
log.Errorf("failed to handle election event, aborting: %v", err)
}, self.fin)
}
// execute task reconciliation, returns when r.done is closed. intended to run as a goroutine.
// if reconciliation is requested while another is in progress, the in-progress operation will be
// cancelled before the new reconciliation operation begins.
func (r *Reconciler) Run(driver bindings.SchedulerDriver) {
var cancel, finished chan struct{}
requestLoop:
for {
select {
case <-r.done:
return
default: // proceed
}
select {
case <-r.implicit:
metrics.ReconciliationRequested.WithLabelValues("implicit").Inc()
select {
case <-r.done:
return
case <-r.explicit:
break // give preference to a pending request for explicit
default: // continue
// don't run implicit reconciliation while explicit is ongoing
if finished != nil {
select {
case <-finished: // continue w/ implicit
default:
log.Infoln("skipping implicit reconcile because explicit reconcile is ongoing")
continue requestLoop
}
}
errOnce := proc.NewErrorOnce(r.done)
errCh := r.Do(func() {
var err error
defer errOnce.Report(err)
log.Infoln("implicit reconcile tasks")
metrics.ReconciliationExecuted.WithLabelValues("implicit").Inc()
if _, err = driver.ReconcileTasks([]*mesos.TaskStatus{}); err != nil {
log.V(1).Infof("failed to request implicit reconciliation from mesos: %v", err)
}
})
proc.OnError(errOnce.Send(errCh).Err(), func(err error) {
log.Errorf("failed to run implicit reconciliation: %v", err)
}, r.done)
goto slowdown
}
case <-r.done:
return
case <-r.explicit: // continue
metrics.ReconciliationRequested.WithLabelValues("explicit").Inc()
}
if cancel != nil {
close(cancel)
cancel = nil
// play nice and wait for the prior operation to finish, complain
// if it doesn't
select {
case <-r.done:
return
case <-finished: // noop, expected
case <-time.After(r.explicitReconciliationAbortTimeout): // very unexpected
log.Error("reconciler action failed to stop upon cancellation")
}
}
// copy 'finished' to 'fin' here in case we end up with simultaneous go-routines,
// if cancellation takes too long or fails - we don't want to close the same chan
// more than once
cancel = make(chan struct{})
finished = make(chan struct{})
go func(fin chan struct{}) {
startedAt := time.Now()
defer func() {
metrics.ReconciliationLatency.Observe(metrics.InMicroseconds(time.Since(startedAt)))
}()
metrics.ReconciliationExecuted.WithLabelValues("explicit").Inc()
defer close(fin)
err := <-r.Action(driver, cancel)
if err == reconciliationCancelledErr {
metrics.ReconciliationCancelled.WithLabelValues("explicit").Inc()
log.Infoln(err.Error())
} else if err != nil {
log.Errorf("reconciler action failed: %v", err)
}
}(finished)
slowdown:
// don't allow reconciliation to run very frequently, either explicit or implicit
select {
case <-r.done:
return
case <-time.After(r.cooldown): // noop
}
} // for
}