func (s *scanCoordinator) handleScanRequest(req *ScanRequest, w ScanResponseWriter,
is IndexSnapshot, t0 time.Time) {
waitTime := time.Now().Sub(t0)
scanPipeline := NewScanPipeline(req, w, is)
cancelCb := NewCancelCallback(req, func(e error) {
scanPipeline.Cancel(e)
})
cancelCb.Run()
defer cancelCb.Done()
err := scanPipeline.Execute()
scanTime := time.Now().Sub(t0)
req.Stats.numRowsReturned.Add(int64(scanPipeline.RowsRead()))
req.Stats.scanBytesRead.Add(int64(scanPipeline.BytesRead()))
req.Stats.scanDuration.Add(scanTime.Nanoseconds())
req.Stats.scanWaitDuration.Add(waitTime.Nanoseconds())
logging.LazyVerbose(func() string {
var status string
if err != nil {
status = fmt.Sprintf("(error = %s)", err)
} else {
status = "ok"
}
return fmt.Sprintf("%s RESPONSE rows:%d, waitTime:%v, totalTime:%v, status:%s",
req.LogPrefix, scanPipeline.RowsRead(), waitTime, scanTime, status)
})
}
func (s *scanCoordinator) serverCallback(protoReq interface{}, conn net.Conn,
cancelCh <-chan interface{}) {
req, err := s.newRequest(protoReq, cancelCh)
w := NewProtoWriter(req.ScanType, conn)
defer func() {
s.handleError(req.LogPrefix, w.Done())
req.Done()
}()
logging.Verbosef("%s REQUEST %s", req.LogPrefix, req)
if req.Consistency != nil {
logging.LazyVerbose(func() string {
return fmt.Sprintf("%s requested timestamp: %s => %s Crc64 => %v", req.LogPrefix,
strings.ToLower(req.Consistency.String()), ScanTStoString(req.Ts), req.Ts.GetCrc64())
})
}
if s.tryRespondWithError(w, req, err) {
return
}
req.Stats.numRequests.Add(1)
t0 := time.Now()
is, err := s.getRequestedIndexSnapshot(req)
if s.tryRespondWithError(w, req, err) {
return
}
defer DestroyIndexSnapshot(is)
logging.LazyVerbose(func() string {
return fmt.Sprintf("%s snapshot timestamp: %s",
req.LogPrefix, ScanTStoString(is.Timestamp()))
})
s.processRequest(req, w, is, t0)
}