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tsdb/wal: pull out wal metrics separately as tsdb.DB (#5957)

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Signed-off-by: johncming <johncming@yahoo.com>
This commit is contained in:
johncming 2019-09-19 19:24:34 +08:00 committed by Krasi Georgiev
parent 29c190df73
commit 612f9cb361
2 changed files with 56 additions and 41 deletions
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93
tsdb/wal/wal.go
View file

@ -177,6 +177,10 @@ type WAL struct {
compress bool
snappyBuf []byte
metrics *walMetrics
}
type walMetrics struct {
fsyncDuration prometheus.Summary
pageFlushes prometheus.Counter
pageCompletions prometheus.Counter
@ -185,6 +189,49 @@ type WAL struct {
currentSegment prometheus.Gauge
}
func newWALMetrics(w *WAL, r prometheus.Registerer) *walMetrics {
m := &walMetrics{}
m.fsyncDuration = prometheus.NewSummary(prometheus.SummaryOpts{
Name: "prometheus_tsdb_wal_fsync_duration_seconds",
Help: "Duration of WAL fsync.",
Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
})
m.pageFlushes = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_page_flushes_total",
Help: "Total number of page flushes.",
})
m.pageCompletions = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_completed_pages_total",
Help: "Total number of completed pages.",
})
m.truncateFail = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_truncations_failed_total",
Help: "Total number of WAL truncations that failed.",
})
m.truncateTotal = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_truncations_total",
Help: "Total number of WAL truncations attempted.",
})
m.currentSegment = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "prometheus_tsdb_wal_segment_current",
Help: "WAL segment index that TSDB is currently writing to.",
})
if r != nil {
r.MustRegister(
m.fsyncDuration,
m.pageFlushes,
m.pageCompletions,
m.truncateFail,
m.truncateTotal,
m.currentSegment,
)
}
return m
}
// New returns a new WAL over the given directory.
func New(logger log.Logger, reg prometheus.Registerer, dir string, compress bool) (*WAL, error) {
return NewSize(logger, reg, dir, DefaultSegmentSize, compress)
@ -211,7 +258,7 @@ func NewSize(logger log.Logger, reg prometheus.Registerer, dir string, segmentSi
stopc: make(chan chan struct{}),
compress: compress,
}
registerMetrics(reg, w)
w.metrics = newWALMetrics(w, reg)
_, last, err := w.Segments()
if err != nil {
@ -249,41 +296,9 @@ func Open(logger log.Logger, reg prometheus.Registerer, dir string) (*WAL, error
logger: logger,
}
registerMetrics(reg, w)
return w, nil
}
func registerMetrics(reg prometheus.Registerer, w *WAL) {
w.fsyncDuration = prometheus.NewSummary(prometheus.SummaryOpts{
Name: "prometheus_tsdb_wal_fsync_duration_seconds",
Help: "Duration of WAL fsync.",
Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
})
w.pageFlushes = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_page_flushes_total",
Help: "Total number of page flushes.",
})
w.pageCompletions = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_completed_pages_total",
Help: "Total number of completed pages.",
})
w.truncateFail = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_truncations_failed_total",
Help: "Total number of WAL truncations that failed.",
})
w.truncateTotal = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_wal_truncations_total",
Help: "Total number of WAL truncations attempted.",
})
w.currentSegment = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "prometheus_tsdb_wal_segment_current",
Help: "WAL segment index that TSDB is currently writing to.",
})
if reg != nil {
reg.MustRegister(w.fsyncDuration, w.pageFlushes, w.pageCompletions, w.truncateFail, w.truncateTotal, w.currentSegment)
}
}
// CompressionEnabled returns if compression is enabled on this WAL.
func (w *WAL) CompressionEnabled() bool {
return w.compress
@ -476,7 +491,7 @@ func (w *WAL) setSegment(segment *Segment) error {
return err
}
w.donePages = int(stat.Size() / pageSize)
w.currentSegment.Set(float64(segment.Index()))
w.metrics.currentSegment.Set(float64(segment.Index()))
return nil
}
@ -484,7 +499,7 @@ func (w *WAL) setSegment(segment *Segment) error {
// the page, the remaining bytes will be set to zero and a new page will be started.
// If clear is true, this is enforced regardless of how many bytes are left in the page.
func (w *WAL) flushPage(clear bool) error {
w.pageFlushes.Inc()
w.metrics.pageFlushes.Inc()
p := w.page
clear = clear || p.full()
@ -504,7 +519,7 @@ func (w *WAL) flushPage(clear bool) error {
if clear {
p.reset()
w.donePages++
w.pageCompletions.Inc()
w.metrics.pageCompletions.Inc()
}
return nil
}
@ -671,10 +686,10 @@ func (w *WAL) Segments() (first, last int, err error) {
// Truncate drops all segments before i.
func (w *WAL) Truncate(i int) (err error) {
w.truncateTotal.Inc()
w.metrics.truncateTotal.Inc()
defer func() {
if err != nil {
w.truncateFail.Inc()
w.metrics.truncateFail.Inc()
}
}()
refs, err := listSegments(w.dir)
@ -695,7 +710,7 @@ func (w *WAL) Truncate(i int) (err error) {
func (w *WAL) fsync(f *Segment) error {
start := time.Now()
err := f.File.Sync()
w.fsyncDuration.Observe(time.Since(start).Seconds())
w.metrics.fsyncDuration.Observe(time.Since(start).Seconds())
return err
}

4
tsdb/wal/wal_test.go
View file

@ -361,7 +361,7 @@ func TestSegmentMetric(t *testing.T) {
w, err := NewSize(nil, nil, dir, segmentSize, false)
testutil.Ok(t, err)
initialSegment := client_testutil.ToFloat64(w.currentSegment)
initialSegment := client_testutil.ToFloat64(w.metrics.currentSegment)
// Write 3 records, each of which is half the segment size, meaning we should rotate to the next segment.
for i := 0; i < 3; i++ {
@ -372,7 +372,7 @@ func TestSegmentMetric(t *testing.T) {
err = w.Log(buf)
testutil.Ok(t, err)
}
testutil.Assert(t, client_testutil.ToFloat64(w.currentSegment) == initialSegment+1, "segment metric did not increment after segment rotation")
testutil.Assert(t, client_testutil.ToFloat64(w.metrics.currentSegment) == initialSegment+1, "segment metric did not increment after segment rotation")
testutil.Ok(t, w.Close())
}