VictoriaMetrics/app/vmselect/netstorage/netstorage.go

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package netstorage
import (
"container/heap"
"flag"
"fmt"
"runtime"
"sort"
"sync"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/decimal"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
"github.com/VictoriaMetrics/metrics"
)
var (
maxTagKeysPerSearch = flag.Int("search.maxTagKeys", 100e3, "The maximum number of tag keys returned per search")
maxTagValuesPerSearch = flag.Int("search.maxTagValues", 100e3, "The maximum number of tag values returned per search")
maxMetricsPerSearch = flag.Int("search.maxUniqueTimeseries", 300e3, "The maximum number of unique time series each search can scan")
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)
// Result is a single timeseries result.
//
// ProcessSearchQuery returns Result slice.
type Result struct {
// The name of the metric.
MetricName storage.MetricName
// Values are sorted by Timestamps.
Values []float64
Timestamps []int64
// Marshaled MetricName. Used only for results sorting
// in app/vmselect/promql
MetricNameMarshaled []byte
}
func (r *Result) reset() {
r.MetricName.Reset()
r.Values = r.Values[:0]
r.Timestamps = r.Timestamps[:0]
r.MetricNameMarshaled = r.MetricNameMarshaled[:0]
}
// Results holds results returned from ProcessSearchQuery.
type Results struct {
tr storage.TimeRange
fetchData bool
deadline Deadline
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packedTimeseries []packedTimeseries
sr *storage.Search
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}
// Len returns the number of results in rss.
func (rss *Results) Len() int {
return len(rss.packedTimeseries)
}
// Cancel cancels rss work.
func (rss *Results) Cancel() {
rss.mustClose()
}
func (rss *Results) mustClose() {
putStorageSearch(rss.sr)
rss.sr = nil
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}
var timeseriesWorkCh = make(chan *timeseriesWork, gomaxprocs)
type timeseriesWork struct {
rss *Results
pts *packedTimeseries
f func(rs *Result, workerID uint)
doneCh chan error
rowsProcessed int
}
func init() {
for i := 0; i < gomaxprocs; i++ {
go timeseriesWorker(uint(i))
}
}
func timeseriesWorker(workerID uint) {
var rs Result
var rsLastResetTime uint64
for tsw := range timeseriesWorkCh {
rss := tsw.rss
if time.Until(rss.deadline.Deadline) < 0 {
tsw.doneCh <- fmt.Errorf("timeout exceeded during query execution: %s", rss.deadline.String())
continue
}
if err := tsw.pts.Unpack(&rs, rss.tr, rss.fetchData); err != nil {
tsw.doneCh <- fmt.Errorf("error during time series unpacking: %s", err)
continue
}
if len(rs.Timestamps) > 0 || !rss.fetchData {
tsw.f(&rs, workerID)
}
tsw.rowsProcessed = len(rs.Values)
tsw.doneCh <- nil
currentTime := fasttime.UnixTimestamp()
if cap(rs.Values) > 1024*1024 && 4*len(rs.Values) < cap(rs.Values) && currentTime-rsLastResetTime > 10 {
// Reset rs in order to preseve memory usage after processing big time series with millions of rows.
rs = Result{}
rsLastResetTime = currentTime
}
}
}
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// RunParallel runs in parallel f for all the results from rss.
//
// f shouldn't hold references to rs after returning.
// workerID is the id of the worker goroutine that calls f.
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//
// rss becomes unusable after the call to RunParallel.
func (rss *Results) RunParallel(f func(rs *Result, workerID uint)) error {
defer rss.mustClose()
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// Feed workers with work.
tsws := make([]*timeseriesWork, len(rss.packedTimeseries))
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for i := range rss.packedTimeseries {
tsw := &timeseriesWork{
rss: rss,
pts: &rss.packedTimeseries[i],
f: f,
doneCh: make(chan error, 1),
}
timeseriesWorkCh <- tsw
tsws[i] = tsw
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}
seriesProcessedTotal := len(rss.packedTimeseries)
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rss.packedTimeseries = rss.packedTimeseries[:0]
// Wait until work is complete.
var firstErr error
rowsProcessedTotal := 0
for _, tsw := range tsws {
if err := <-tsw.doneCh; err != nil && firstErr == nil {
// Return just the first error, since other errors
// are likely duplicate the first error.
firstErr = err
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}
rowsProcessedTotal += tsw.rowsProcessed
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}
perQueryRowsProcessed.Update(float64(rowsProcessedTotal))
perQuerySeriesProcessed.Update(float64(seriesProcessedTotal))
return firstErr
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}
var perQueryRowsProcessed = metrics.NewHistogram(`vm_per_query_rows_processed_count`)
var perQuerySeriesProcessed = metrics.NewHistogram(`vm_per_query_series_processed_count`)
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var gomaxprocs = runtime.GOMAXPROCS(-1)
type packedTimeseries struct {
metricName string
brs []storage.BlockRef
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}
var unpackWorkCh = make(chan *unpackWork, gomaxprocs)
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type unpackWork struct {
br storage.BlockRef
tr storage.TimeRange
fetchData bool
doneCh chan error
sb *sortBlock
}
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func init() {
for i := 0; i < gomaxprocs; i++ {
go unpackWorker()
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}
}
func unpackWorker() {
for upw := range unpackWorkCh {
sb := getSortBlock()
if err := sb.unpackFrom(upw.br, upw.tr, upw.fetchData); err != nil {
putSortBlock(sb)
upw.doneCh <- fmt.Errorf("cannot unpack block: %s", err)
continue
}
upw.sb = sb
upw.doneCh <- nil
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}
}
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// Unpack unpacks pts to dst.
func (pts *packedTimeseries) Unpack(dst *Result, tr storage.TimeRange, fetchData bool) error {
dst.reset()
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if err := dst.MetricName.Unmarshal(bytesutil.ToUnsafeBytes(pts.metricName)); err != nil {
return fmt.Errorf("cannot unmarshal metricName %q: %s", pts.metricName, err)
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}
// Feed workers with work
upws := make([]*unpackWork, len(pts.brs))
for i, br := range pts.brs {
upw := &unpackWork{
br: br,
tr: tr,
fetchData: fetchData,
doneCh: make(chan error, 1),
}
unpackWorkCh <- upw
upws[i] = upw
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}
pts.brs = pts.brs[:0]
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// Wait until work is complete
sbs := make([]*sortBlock, 0, len(pts.brs))
var firstErr error
for _, upw := range upws {
if err := <-upw.doneCh; err != nil && firstErr == nil {
// Return the first error only, since other errors are likely the same.
firstErr = err
}
if firstErr == nil {
sbs = append(sbs, upw.sb)
} else {
putSortBlock(upw.sb)
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}
}
if firstErr != nil {
return firstErr
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}
mergeSortBlocks(dst, sbs)
return nil
}
func getSortBlock() *sortBlock {
v := sbPool.Get()
if v == nil {
return &sortBlock{}
}
return v.(*sortBlock)
}
func putSortBlock(sb *sortBlock) {
sb.reset()
sbPool.Put(sb)
}
var sbPool sync.Pool
var metricRowsSkipped = metrics.NewCounter(`vm_metric_rows_skipped_total{name="vmselect"}`)
func mergeSortBlocks(dst *Result, sbh sortBlocksHeap) {
// Skip empty sort blocks, since they cannot be passed to heap.Init.
src := sbh
sbh = sbh[:0]
for _, sb := range src {
if len(sb.Timestamps) == 0 {
putSortBlock(sb)
continue
}
sbh = append(sbh, sb)
}
if len(sbh) == 0 {
return
}
heap.Init(&sbh)
for {
top := sbh[0]
heap.Pop(&sbh)
if len(sbh) == 0 {
dst.Timestamps = append(dst.Timestamps, top.Timestamps[top.NextIdx:]...)
dst.Values = append(dst.Values, top.Values[top.NextIdx:]...)
putSortBlock(top)
break
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}
sbNext := sbh[0]
tsNext := sbNext.Timestamps[sbNext.NextIdx]
idxNext := len(top.Timestamps)
if top.Timestamps[idxNext-1] > tsNext {
idxNext = top.NextIdx
for top.Timestamps[idxNext] <= tsNext {
idxNext++
}
}
dst.Timestamps = append(dst.Timestamps, top.Timestamps[top.NextIdx:idxNext]...)
dst.Values = append(dst.Values, top.Values[top.NextIdx:idxNext]...)
if idxNext < len(top.Timestamps) {
top.NextIdx = idxNext
heap.Push(&sbh, top)
} else {
// Return top to the pool.
putSortBlock(top)
}
}
timestamps, values := storage.DeduplicateSamples(dst.Timestamps, dst.Values)
dedups := len(dst.Timestamps) - len(timestamps)
dedupsDuringSelect.Add(dedups)
dst.Timestamps = timestamps
dst.Values = values
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}
var dedupsDuringSelect = metrics.NewCounter(`vm_deduplicated_samples_total{type="select"}`)
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type sortBlock struct {
// b is used as a temporary storage for unpacked rows before they
// go to Timestamps and Values.
b storage.Block
Timestamps []int64
Values []float64
NextIdx int
}
func (sb *sortBlock) reset() {
sb.b.Reset()
sb.Timestamps = sb.Timestamps[:0]
sb.Values = sb.Values[:0]
sb.NextIdx = 0
}
func (sb *sortBlock) unpackFrom(br storage.BlockRef, tr storage.TimeRange, fetchData bool) error {
br.MustReadBlock(&sb.b, fetchData)
if fetchData {
if err := sb.b.UnmarshalData(); err != nil {
return fmt.Errorf("cannot unmarshal block: %s", err)
}
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}
timestamps := sb.b.Timestamps()
// Skip timestamps smaller than tr.MinTimestamp.
i := 0
for i < len(timestamps) && timestamps[i] < tr.MinTimestamp {
i++
}
// Skip timestamps bigger than tr.MaxTimestamp.
j := len(timestamps)
for j > i && timestamps[j-1] > tr.MaxTimestamp {
j--
}
skippedRows := sb.b.RowsCount() - (j - i)
metricRowsSkipped.Add(skippedRows)
// Copy the remaining values.
if i == j {
return nil
}
values := sb.b.Values()
sb.Timestamps = append(sb.Timestamps, timestamps[i:j]...)
sb.Values = decimal.AppendDecimalToFloat(sb.Values, values[i:j], sb.b.Scale())
return nil
}
type sortBlocksHeap []*sortBlock
func (sbh sortBlocksHeap) Len() int {
return len(sbh)
}
func (sbh sortBlocksHeap) Less(i, j int) bool {
a := sbh[i]
b := sbh[j]
return a.Timestamps[a.NextIdx] < b.Timestamps[b.NextIdx]
}
func (sbh sortBlocksHeap) Swap(i, j int) {
sbh[i], sbh[j] = sbh[j], sbh[i]
}
func (sbh *sortBlocksHeap) Push(x interface{}) {
*sbh = append(*sbh, x.(*sortBlock))
}
func (sbh *sortBlocksHeap) Pop() interface{} {
a := *sbh
v := a[len(a)-1]
*sbh = a[:len(a)-1]
return v
}
// DeleteSeries deletes time series matching the given tagFilterss.
func DeleteSeries(sq *storage.SearchQuery) (int, error) {
tfss, err := setupTfss(sq.TagFilterss)
if err != nil {
return 0, err
}
return vmstorage.DeleteMetrics(tfss)
}
// GetLabels returns labels until the given deadline.
func GetLabels(deadline Deadline) ([]string, error) {
labels, err := vmstorage.SearchTagKeys(*maxTagKeysPerSearch)
if err != nil {
return nil, fmt.Errorf("error during labels search: %s", err)
}
// Substitute "" with "__name__"
for i := range labels {
if labels[i] == "" {
labels[i] = "__name__"
}
}
// Sort labels like Prometheus does
sort.Strings(labels)
return labels, nil
}
// GetLabelValues returns label values for the given labelName
// until the given deadline.
func GetLabelValues(labelName string, deadline Deadline) ([]string, error) {
if labelName == "__name__" {
labelName = ""
}
// Search for tag values
labelValues, err := vmstorage.SearchTagValues([]byte(labelName), *maxTagValuesPerSearch)
if err != nil {
return nil, fmt.Errorf("error during label values search for labelName=%q: %s", labelName, err)
}
// Sort labelValues like Prometheus does
sort.Strings(labelValues)
return labelValues, nil
}
// GetLabelEntries returns all the label entries until the given deadline.
func GetLabelEntries(deadline Deadline) ([]storage.TagEntry, error) {
labelEntries, err := vmstorage.SearchTagEntries(*maxTagKeysPerSearch, *maxTagValuesPerSearch)
if err != nil {
return nil, fmt.Errorf("error during label entries request: %s", err)
}
// Substitute "" with "__name__"
for i := range labelEntries {
e := &labelEntries[i]
if e.Key == "" {
e.Key = "__name__"
}
}
// Sort labelEntries by the number of label values in each entry.
sort.Slice(labelEntries, func(i, j int) bool {
a, b := labelEntries[i].Values, labelEntries[j].Values
if len(a) != len(b) {
return len(a) > len(b)
}
return labelEntries[i].Key > labelEntries[j].Key
})
return labelEntries, nil
}
// GetTSDBStatusForDate returns tsdb status according to https://prometheus.io/docs/prometheus/latest/querying/api/#tsdb-stats
func GetTSDBStatusForDate(deadline Deadline, date uint64, topN int) (*storage.TSDBStatus, error) {
status, err := vmstorage.GetTSDBStatusForDate(date, topN)
if err != nil {
return nil, fmt.Errorf("error during tsdb status request: %s", err)
}
return status, nil
}
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// GetSeriesCount returns the number of unique series.
func GetSeriesCount(deadline Deadline) (uint64, error) {
n, err := vmstorage.GetSeriesCount()
if err != nil {
return 0, fmt.Errorf("error during series count request: %s", err)
}
return n, nil
}
func getStorageSearch() *storage.Search {
v := ssPool.Get()
if v == nil {
return &storage.Search{}
}
return v.(*storage.Search)
}
func putStorageSearch(sr *storage.Search) {
sr.MustClose()
ssPool.Put(sr)
}
var ssPool sync.Pool
// ProcessSearchQuery performs sq on storage nodes until the given deadline.
//
// Results.RunParallel or Results.Cancel must be called on the returned Results.
func ProcessSearchQuery(sq *storage.SearchQuery, fetchData bool, deadline Deadline) (*Results, error) {
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// Setup search.
tfss, err := setupTfss(sq.TagFilterss)
if err != nil {
return nil, err
}
tr := storage.TimeRange{
MinTimestamp: sq.MinTimestamp,
MaxTimestamp: sq.MaxTimestamp,
}
vmstorage.WG.Add(1)
defer vmstorage.WG.Done()
sr := getStorageSearch()
sr.Init(vmstorage.Storage, tfss, tr, *maxMetricsPerSearch)
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m := make(map[string][]storage.BlockRef)
var orderedMetricNames []string
blocksRead := 0
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for sr.NextMetricBlock() {
blocksRead++
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if time.Until(deadline.Deadline) < 0 {
return nil, fmt.Errorf("timeout exceeded while fetching data block #%d from storage: %s", blocksRead, deadline.String())
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}
metricName := sr.MetricBlockRef.MetricName
brs := m[string(metricName)]
if len(brs) == 0 {
orderedMetricNames = append(orderedMetricNames, string(metricName))
}
m[string(metricName)] = append(brs, *sr.MetricBlockRef.BlockRef)
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}
if err := sr.Error(); err != nil {
return nil, fmt.Errorf("search error after reading %d data blocks: %s", blocksRead, err)
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}
var rss Results
rss.tr = tr
rss.fetchData = fetchData
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rss.deadline = deadline
pts := make([]packedTimeseries, len(orderedMetricNames))
for i, metricName := range orderedMetricNames {
pts[i] = packedTimeseries{
metricName: metricName,
brs: m[metricName],
}
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}
rss.packedTimeseries = pts
rss.sr = sr
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return &rss, nil
}
func setupTfss(tagFilterss [][]storage.TagFilter) ([]*storage.TagFilters, error) {
tfss := make([]*storage.TagFilters, 0, len(tagFilterss))
for _, tagFilters := range tagFilterss {
tfs := storage.NewTagFilters()
for i := range tagFilters {
tf := &tagFilters[i]
if err := tfs.Add(tf.Key, tf.Value, tf.IsNegative, tf.IsRegexp); err != nil {
return nil, fmt.Errorf("cannot parse tag filter %s: %s", tf, err)
}
}
tfss = append(tfss, tfs)
tfss = append(tfss, tfs.Finalize()...)
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}
return tfss, nil
}
// Deadline contains deadline with the corresponding timeout for pretty error messages.
type Deadline struct {
Deadline time.Time
timeout time.Duration
flagHint string
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}
// NewDeadline returns deadline for the given timeout.
//
// flagHint must contain a hit for command-line flag, which could be used
// in order to increase timeout.
func NewDeadline(timeout time.Duration, flagHint string) Deadline {
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return Deadline{
Deadline: time.Now().Add(timeout),
timeout: timeout,
flagHint: flagHint,
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}
}
// String returns human-readable string representation for d.
func (d *Deadline) String() string {
return fmt.Sprintf("%.3f seconds; the timeout can be adjusted with `%s` command-line flag", d.timeout.Seconds(), d.flagHint)
}