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etcdserver/api/snap: add v3 snapshot fsync metrics

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etcd_snap_db_fsync_duration_seconds_count
etcd_snap_db_save_total_duration_seconds_bucket

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>
This commit is contained in:
Gyuho Lee 2018-08-11 21:08:35 -07:00 committed by Wenjia Zhang
parent b3fa36eb7f
commit 8f1d366c0e
2 changed files with 30 additions and 0 deletions
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6
snap/db.go
View File

@ -21,6 +21,7 @@ import (
"io/ioutil"
"os"
"path/filepath"
"time"
"github.com/coreos/etcd/pkg/fileutil"
)
@ -30,6 +31,8 @@ var ErrNoDBSnapshot = errors.New("snap: snapshot file doesn't exist")
// SaveDBFrom saves snapshot of the database from the given reader. It
// guarantees the save operation is atomic.
func (s *Snapshotter) SaveDBFrom(r io.Reader, id uint64) (int64, error) {
start := time.Now()
f, err := ioutil.TempFile(s.dir, "tmp")
if err != nil {
return 0, err
@ -37,7 +40,9 @@ func (s *Snapshotter) SaveDBFrom(r io.Reader, id uint64) (int64, error) {
var n int64
n, err = io.Copy(f, r)
if err == nil {
fsyncStart := time.Now()
err = fileutil.Fsync(f)
snapDBFsyncSec.Observe(time.Since(fsyncStart).Seconds())
}
f.Close()
if err != nil {
@ -57,6 +62,7 @@ func (s *Snapshotter) SaveDBFrom(r io.Reader, id uint64) (int64, error) {
plog.Infof("saved database snapshot to disk [total bytes: %d]", n)
snapDBSaveSec.Observe(time.Since(start).Seconds())
return n, nil
}

24
snap/metrics.go
View File

@ -33,9 +33,33 @@ var (
Help: "The marshalling cost distributions of save called by snapshot.",
Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
})
snapDBSaveSec = prometheus.NewHistogram(prometheus.HistogramOpts{
Namespace: "etcd",
Subsystem: "snap_db",
Name: "save_total_duration_seconds",
Help: "The total latency distributions of v3 snapshot save",
// lowest bucket start of upper bound 0.1 sec (100 ms) with factor 2
// highest bucket start of 0.1 sec * 2^9 == 51.2 sec
Buckets: prometheus.ExponentialBuckets(0.1, 2, 10),
})
snapDBFsyncSec = prometheus.NewHistogram(prometheus.HistogramOpts{
Namespace: "etcd",
Subsystem: "snap_db",
Name: "fsync_duration_seconds",
Help: "The latency distributions of fsyncing .snap.db file",
// lowest bucket start of upper bound 0.001 sec (1 ms) with factor 2
// highest bucket start of 0.001 sec * 2^13 == 8.192 sec
Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
})
)
func init() {
prometheus.MustRegister(saveDurations)
prometheus.MustRegister(marshallingDurations)
prometheus.MustRegister(snapDBSaveSec)
prometheus.MustRegister(snapDBFsyncSec)
}