VictoriaMetrics/app/vlinsert/jsonline/jsonline.go
Aliaksandr Valialkin cc8f2bee0d
app/vlinsert: follow-up for d570763c91
- Switch from summary to histogram for vl_http_request_duration_seconds metric.
  This allows calculating request duration quantiles across multiple hosts
  via histogram_quantile(0.99, sum(vl_http_request_duration_seconds_bucket) by (vmrange)).
- Take into account only successfully processed data ingestion requests
  when updating vl_http_request_duration_seconds histogram.
  Failed requests are ignored, since they may significantly skew measurements.
- Clarify the description of the change at docs/VictoriaLogs/CHANGELOG.md.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4934
2023-09-19 00:45:28 +02:00

156 lines
4.3 KiB
Go

package jsonline
import (
"bufio"
"errors"
"fmt"
"net/http"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vlinsert/insertutils"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vlstorage"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logjson"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logstorage"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/writeconcurrencylimiter"
"github.com/VictoriaMetrics/metrics"
)
// RequestHandler processes jsonline insert requests
func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
startTime := time.Now()
w.Header().Add("Content-Type", "application/json")
if r.Method != "POST" {
w.WriteHeader(http.StatusMethodNotAllowed)
return true
}
requestsTotal.Inc()
cp, err := insertutils.GetCommonParams(r)
if err != nil {
httpserver.Errorf(w, r, "%s", err)
return true
}
lr := logstorage.GetLogRows(cp.StreamFields, cp.IgnoreFields)
processLogMessage := cp.GetProcessLogMessageFunc(lr)
reader := r.Body
if r.Header.Get("Content-Encoding") == "gzip" {
zr, err := common.GetGzipReader(reader)
if err != nil {
logger.Errorf("cannot read gzipped _bulk request: %s", err)
return true
}
defer common.PutGzipReader(zr)
reader = zr
}
wcr := writeconcurrencylimiter.GetReader(reader)
defer writeconcurrencylimiter.PutReader(wcr)
lb := lineBufferPool.Get()
defer lineBufferPool.Put(lb)
lb.B = bytesutil.ResizeNoCopyNoOverallocate(lb.B, insertutils.MaxLineSizeBytes.IntN())
sc := bufio.NewScanner(wcr)
sc.Buffer(lb.B, len(lb.B))
n := 0
for {
ok, err := readLine(sc, cp.TimeField, cp.MsgField, processLogMessage)
wcr.DecConcurrency()
if err != nil {
logger.Errorf("cannot read line #%d in /jsonline request: %s", n, err)
break
}
if !ok {
break
}
n++
rowsIngestedTotal.Inc()
}
vlstorage.MustAddRows(lr)
logstorage.PutLogRows(lr)
// update jsonlineRequestDuration only for successfully parsed requests.
// There is no need in updating jsonlineRequestDuration for request errors,
// since their timings are usually much smaller than the timing for successful request parsing.
jsonlineRequestDuration.UpdateDuration(startTime)
return true
}
func readLine(sc *bufio.Scanner, timeField, msgField string, processLogMessage func(timestamp int64, fields []logstorage.Field)) (bool, error) {
var line []byte
for len(line) == 0 {
if !sc.Scan() {
if err := sc.Err(); err != nil {
if errors.Is(err, bufio.ErrTooLong) {
return false, fmt.Errorf(`cannot read json line, since its size exceeds -insert.maxLineSizeBytes=%d`, insertutils.MaxLineSizeBytes.IntN())
}
return false, err
}
return false, nil
}
line = sc.Bytes()
}
p := logjson.GetParser()
if err := p.ParseLogMessage(line); err != nil {
return false, fmt.Errorf("cannot parse json-encoded log entry: %w", err)
}
ts, err := extractTimestampFromFields(timeField, p.Fields)
if err != nil {
return false, fmt.Errorf("cannot parse timestamp: %w", err)
}
if ts == 0 {
ts = time.Now().UnixNano()
}
p.RenameField(msgField, "_msg")
processLogMessage(ts, p.Fields)
logjson.PutParser(p)
return true, nil
}
func extractTimestampFromFields(timeField string, fields []logstorage.Field) (int64, error) {
for i := range fields {
f := &fields[i]
if f.Name != timeField {
continue
}
timestamp, err := parseISO8601Timestamp(f.Value)
if err != nil {
return 0, err
}
f.Value = ""
return timestamp, nil
}
return 0, nil
}
func parseISO8601Timestamp(s string) (int64, error) {
if s == "0" || s == "" {
// Special case for returning the current timestamp.
// It must be automatically converted to the current timestamp by the caller.
return 0, nil
}
t, err := time.Parse(time.RFC3339, s)
if err != nil {
return 0, fmt.Errorf("cannot parse timestamp %q: %w", s, err)
}
return t.UnixNano(), nil
}
var lineBufferPool bytesutil.ByteBufferPool
var (
requestsTotal = metrics.NewCounter(`vl_http_requests_total{path="/insert/jsonline"}`)
rowsIngestedTotal = metrics.NewCounter(`vl_rows_ingested_total{type="jsonline"}`)
jsonlineRequestDuration = metrics.NewHistogram(`vl_http_request_duration_seconds{path="/insert/jsonline"}`)
)