mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-22 16:36:27 +01:00
0af9e2b693
Thanks to @oliverpool for nailing down the root cause of the issue and for the initial attempt to fix it at https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3927
457 lines
13 KiB
Go
457 lines
13 KiB
Go
package promql
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"sort"
|
|
"strconv"
|
|
"sync"
|
|
"unsafe"
|
|
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
|
|
)
|
|
|
|
type timeseries struct {
|
|
MetricName storage.MetricName
|
|
Values []float64
|
|
Timestamps []int64
|
|
|
|
// Whether the timeseries may be re-used.
|
|
// Timeseries may be re-used only if their members own values
|
|
// they refer to.
|
|
denyReuse bool
|
|
}
|
|
|
|
func (ts *timeseries) Reset() {
|
|
if ts.denyReuse {
|
|
*ts = timeseries{}
|
|
return
|
|
}
|
|
|
|
ts.MetricName.Reset()
|
|
ts.Values = ts.Values[:0]
|
|
ts.Timestamps = ts.Timestamps[:0]
|
|
}
|
|
|
|
func (ts *timeseries) String() string {
|
|
return fmt.Sprintf("MetricName=%s, Values=%g, Timestamps=%d", &ts.MetricName, ts.Values, ts.Timestamps)
|
|
}
|
|
|
|
func (ts *timeseries) CopyFromShallowTimestamps(src *timeseries) {
|
|
ts.Reset()
|
|
ts.MetricName.CopyFrom(&src.MetricName)
|
|
ts.Values = append(ts.Values[:0], src.Values...)
|
|
ts.Timestamps = src.Timestamps
|
|
|
|
ts.denyReuse = true
|
|
}
|
|
|
|
func (ts *timeseries) CopyFromMetricNames(src *timeseries) {
|
|
ts.Reset()
|
|
ts.MetricName.CopyFrom(&src.MetricName)
|
|
ts.Values = src.Values
|
|
ts.Timestamps = src.Timestamps
|
|
|
|
ts.denyReuse = true
|
|
}
|
|
|
|
func (ts *timeseries) CopyShallow(src *timeseries) {
|
|
*ts = *src
|
|
ts.denyReuse = true
|
|
}
|
|
|
|
func getTimeseries() *timeseries {
|
|
if v := timeseriesPool.Get(); v != nil {
|
|
return v.(*timeseries)
|
|
}
|
|
return ×eries{}
|
|
}
|
|
|
|
func putTimeseries(ts *timeseries) {
|
|
ts.Reset()
|
|
timeseriesPool.Put(ts)
|
|
}
|
|
|
|
var timeseriesPool sync.Pool
|
|
|
|
func marshalTimeseriesFast(dst []byte, tss []*timeseries, maxSize int, step int64) []byte {
|
|
if len(tss) == 0 {
|
|
logger.Panicf("BUG: tss cannot be empty")
|
|
}
|
|
|
|
// timestamps are stored only once for all the tss, since they must be identical
|
|
assertIdenticalTimestamps(tss, step)
|
|
timestamps := tss[0].Timestamps
|
|
|
|
// Calculate the required size for marshaled tss.
|
|
size := 8 + 8 // 8 bytes for len(tss) and 8 bytes for len(timestamps)
|
|
size += 8 * len(timestamps) // encoded timestamps
|
|
size += 8 * len(tss) * len(timestamps) // encoded values
|
|
for _, ts := range tss {
|
|
size += marshaledFastMetricNameSize(&ts.MetricName)
|
|
}
|
|
if size > maxSize {
|
|
// Do not marshal tss, since it would occupy too much space
|
|
return dst
|
|
}
|
|
|
|
// Allocate the buffer for the marshaled tss before its' marshaling.
|
|
// This should reduce memory fragmentation and memory usage.
|
|
dstLen := len(dst)
|
|
dst = bytesutil.ResizeWithCopyMayOverallocate(dst, size+dstLen)
|
|
dst = dst[:dstLen]
|
|
|
|
// Marshal timestamps and values at first, so they are 8-byte aligned.
|
|
// This prevents from SIGBUS error on arm architectures.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3927
|
|
dst = encoding.MarshalUint64(dst, uint64(len(tss)))
|
|
dst = encoding.MarshalUint64(dst, uint64(len(timestamps)))
|
|
dst = marshalTimestampsFast(dst, timestamps)
|
|
for _, ts := range tss {
|
|
dst = marshalValuesFast(dst, ts.Values)
|
|
}
|
|
for _, ts := range tss {
|
|
dst = marshalMetricNameFast(dst, &ts.MetricName)
|
|
}
|
|
return dst
|
|
}
|
|
|
|
// unmarshalTimeseriesFast unmarshals timeseries from src.
|
|
//
|
|
// The returned timeseries refer to src, so it is unsafe to modify it while timeseries are in use.
|
|
func unmarshalTimeseriesFast(src []byte) ([]*timeseries, error) {
|
|
if len(src) < 16 {
|
|
return nil, fmt.Errorf("cannot unmarshal timeseries from %d bytes; need at least 16 bytes", len(src))
|
|
}
|
|
tssLen := encoding.UnmarshalUint64(src)
|
|
timestampsLen := encoding.UnmarshalUint64(src[8:])
|
|
src = src[16:]
|
|
|
|
// Unmarshal timestamps
|
|
tail, timestamps, err := unmarshalTimestampsFast(src, timestampsLen)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
src = tail
|
|
|
|
tss := make([]*timeseries, tssLen)
|
|
for i := range tss {
|
|
var ts timeseries
|
|
ts.denyReuse = true
|
|
ts.Timestamps = timestamps
|
|
tss[i] = &ts
|
|
}
|
|
|
|
// Unmarshal values
|
|
for _, ts := range tss {
|
|
tail, values, err := unmarshalValuesFast(src, timestampsLen)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ts.Values = values
|
|
src = tail
|
|
}
|
|
|
|
// Unmarshal metric names for the time series
|
|
for _, ts := range tss {
|
|
tail, err := unmarshalMetricNameFast(&ts.MetricName, src)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
src = tail
|
|
}
|
|
|
|
if len(src) > 0 {
|
|
return nil, fmt.Errorf("unexpected non-empty tail left after unmarshaling %d timeseries; len(tail)=%d", len(tss), len(src))
|
|
}
|
|
return tss, nil
|
|
}
|
|
|
|
// marshaledFastMetricNameSize returns the size of marshaled mn returned from marshalMetricNameFast.
|
|
func marshaledFastMetricNameSize(mn *storage.MetricName) int {
|
|
n := 0
|
|
n += 2 + len(mn.MetricGroup)
|
|
n += 2 // Length of tags.
|
|
for i := range mn.Tags {
|
|
tag := &mn.Tags[i]
|
|
n += 2 + len(tag.Key)
|
|
n += 2 + len(tag.Value)
|
|
}
|
|
return n
|
|
}
|
|
|
|
func marshalValuesFast(dst []byte, values []float64) []byte {
|
|
// Do not marshal len(values), since it is already encoded as len(timestamps) at marshalTimestampsFast.
|
|
valuesBuf := float64ToByteSlice(values)
|
|
dst = append(dst, valuesBuf...)
|
|
return dst
|
|
}
|
|
|
|
// it is unsafe modifying src while the returned values is in use.
|
|
func unmarshalValuesFast(src []byte, valuesLen uint64) ([]byte, []float64, error) {
|
|
bufSize := valuesLen * 8
|
|
if uint64(len(src)) < bufSize {
|
|
return src, nil, fmt.Errorf("cannot unmarshal values; got %d ytes; want at least %d bytes", uint64(len(src)), bufSize)
|
|
}
|
|
values := byteSliceToFloat64(src[:bufSize])
|
|
return src[bufSize:], values, nil
|
|
}
|
|
|
|
func marshalTimestampsFast(dst []byte, timestamps []int64) []byte {
|
|
timestampsBuf := int64ToByteSlice(timestamps)
|
|
dst = append(dst, timestampsBuf...)
|
|
return dst
|
|
}
|
|
|
|
// it is unsafe modifying src while the returned timestamps is in use.
|
|
func unmarshalTimestampsFast(src []byte, timestampsLen uint64) ([]byte, []int64, error) {
|
|
bufSize := timestampsLen * 8
|
|
if uint64(len(src)) < bufSize {
|
|
return src, nil, fmt.Errorf("cannot unmarshal timestamps; got %d bytes; want at least %d bytes", len(src), bufSize)
|
|
}
|
|
timestamps := byteSliceToInt64(src[:bufSize])
|
|
return src[bufSize:], timestamps, nil
|
|
}
|
|
|
|
// marshalMetricNameFast appends marshaled mn to dst and returns the result.
|
|
//
|
|
// The result must be unmarshaled with unmarshalMetricNameFast.
|
|
func marshalMetricNameFast(dst []byte, mn *storage.MetricName) []byte {
|
|
dst = marshalBytesFast(dst, mn.MetricGroup)
|
|
dst = encoding.MarshalUint16(dst, uint16(len(mn.Tags)))
|
|
// There is no need in tags' sorting - they must be sorted after unmarshaling.
|
|
return marshalMetricTagsFast(dst, mn.Tags)
|
|
}
|
|
|
|
// unmarshalMetricNameFast unmarshals mn from src, so mn members hold references to src.
|
|
//
|
|
// It is unsafe modifying src while mn is in use.
|
|
func unmarshalMetricNameFast(mn *storage.MetricName, src []byte) ([]byte, error) {
|
|
mn.Reset()
|
|
|
|
tail, metricGroup, err := unmarshalBytesFast(src)
|
|
if err != nil {
|
|
return tail, fmt.Errorf("cannot unmarshal MetricGroup: %w", err)
|
|
}
|
|
src = tail
|
|
mn.MetricGroup = metricGroup[:len(metricGroup):len(metricGroup)]
|
|
|
|
if len(src) < 2 {
|
|
return src, fmt.Errorf("not enough bytes for unmarshaling len(tags); need at least 2 bytes; got %d bytes", len(src))
|
|
}
|
|
tagsLen := encoding.UnmarshalUint16(src)
|
|
src = src[2:]
|
|
if n := int(tagsLen) - cap(mn.Tags); n > 0 {
|
|
mn.Tags = append(mn.Tags[:cap(mn.Tags)], make([]storage.Tag, n)...)
|
|
}
|
|
mn.Tags = mn.Tags[:tagsLen]
|
|
for i := range mn.Tags {
|
|
tail, key, err := unmarshalBytesFast(src)
|
|
if err != nil {
|
|
return tail, fmt.Errorf("cannot unmarshal key for tag[%d]: %w", i, err)
|
|
}
|
|
src = tail
|
|
|
|
tail, value, err := unmarshalBytesFast(src)
|
|
if err != nil {
|
|
return tail, fmt.Errorf("cannot unmarshal value for tag[%d]: %w", i, err)
|
|
}
|
|
src = tail
|
|
|
|
tag := &mn.Tags[i]
|
|
tag.Key = key[:len(key):len(key)]
|
|
tag.Value = value[:len(value):len(value)]
|
|
}
|
|
return src, nil
|
|
}
|
|
|
|
func marshalMetricTagsFast(dst []byte, tags []storage.Tag) []byte {
|
|
for i := range tags {
|
|
tag := &tags[i]
|
|
dst = marshalBytesFast(dst, tag.Key)
|
|
dst = marshalBytesFast(dst, tag.Value)
|
|
}
|
|
return dst
|
|
}
|
|
|
|
func marshalMetricNameSorted(dst []byte, mn *storage.MetricName) []byte {
|
|
dst = marshalBytesFast(dst, mn.MetricGroup)
|
|
return marshalMetricTagsSorted(dst, mn)
|
|
}
|
|
|
|
func marshalMetricTagsSorted(dst []byte, mn *storage.MetricName) []byte {
|
|
sortMetricTags(mn)
|
|
return marshalMetricTagsFast(dst, mn.Tags)
|
|
}
|
|
|
|
func marshalBytesFast(dst []byte, s []byte) []byte {
|
|
dst = encoding.MarshalUint16(dst, uint16(len(s)))
|
|
dst = append(dst, s...)
|
|
return dst
|
|
}
|
|
|
|
func unmarshalBytesFast(src []byte) ([]byte, []byte, error) {
|
|
if len(src) < 2 {
|
|
return src, nil, fmt.Errorf("cannot decode size form src=%X; it must be at least 2 bytes", src)
|
|
}
|
|
n := encoding.UnmarshalUint16(src)
|
|
src = src[2:]
|
|
if len(src) < int(n) {
|
|
return src, nil, fmt.Errorf("too short src=%X; it must be at least %d bytes", src, n)
|
|
}
|
|
return src[n:], src[:n], nil
|
|
}
|
|
|
|
func float64ToByteSlice(a []float64) (b []byte) {
|
|
if len(a) == 0 {
|
|
return nil
|
|
}
|
|
sh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
|
|
sh.Data = uintptr(unsafe.Pointer(&a[0]))
|
|
sh.Len = len(a) * int(unsafe.Sizeof(a[0]))
|
|
sh.Cap = sh.Len
|
|
return
|
|
}
|
|
|
|
func int64ToByteSlice(a []int64) (b []byte) {
|
|
if len(a) == 0 {
|
|
return nil
|
|
}
|
|
sh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
|
|
sh.Data = uintptr(unsafe.Pointer(&a[0]))
|
|
sh.Len = len(a) * int(unsafe.Sizeof(a[0]))
|
|
sh.Cap = sh.Len
|
|
return
|
|
}
|
|
|
|
func byteSliceToInt64(b []byte) (a []int64) {
|
|
if len(b) == 0 {
|
|
return nil
|
|
}
|
|
sh := (*reflect.SliceHeader)(unsafe.Pointer(&a))
|
|
sh.Data = uintptr(unsafe.Pointer(&b[0]))
|
|
sh.Len = len(b) / int(unsafe.Sizeof(a[0]))
|
|
sh.Cap = sh.Len
|
|
// Make sure that the returned slice is properly aligned to 8 bytes.
|
|
// This prevents from SIGBUS error on arm architectures, which deny unaligned access.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3927
|
|
if sh.Data%8 != 0 {
|
|
logger.Panicf("BUG: the input byte slice b must be aligned to 8 bytes")
|
|
}
|
|
return
|
|
}
|
|
|
|
func byteSliceToFloat64(b []byte) (a []float64) {
|
|
if len(b) == 0 {
|
|
return nil
|
|
}
|
|
sh := (*reflect.SliceHeader)(unsafe.Pointer(&a))
|
|
sh.Data = uintptr(unsafe.Pointer(&b[0]))
|
|
sh.Len = len(b) / int(unsafe.Sizeof(a[0]))
|
|
sh.Cap = sh.Len
|
|
// Make sure that the returned slice is properly aligned to 8 bytes.
|
|
// This prevents from SIGBUS error on arm architectures, which deny unaligned access.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3927
|
|
if sh.Data%8 != 0 {
|
|
logger.Panicf("BUG: the input byte slice b must be aligned to 8 bytes")
|
|
}
|
|
return
|
|
}
|
|
|
|
func stringMetricName(mn *storage.MetricName) string {
|
|
var dst []byte
|
|
dst = append(dst, mn.MetricGroup...)
|
|
sortMetricTags(mn)
|
|
dst = appendStringMetricTags(dst, mn.Tags)
|
|
return string(dst)
|
|
}
|
|
|
|
func stringMetricTags(mn *storage.MetricName) string {
|
|
var dst []byte
|
|
sortMetricTags(mn)
|
|
dst = appendStringMetricTags(dst, mn.Tags)
|
|
return string(dst)
|
|
}
|
|
|
|
func appendStringMetricTags(dst []byte, tags []storage.Tag) []byte {
|
|
dst = append(dst, '{')
|
|
for i := range tags {
|
|
tag := &tags[i]
|
|
dst = append(dst, tag.Key...)
|
|
dst = append(dst, '=')
|
|
value := bytesutil.ToUnsafeString(tag.Value)
|
|
dst = strconv.AppendQuote(dst, value)
|
|
if i+1 < len(tags) {
|
|
dst = append(dst, ", "...)
|
|
}
|
|
}
|
|
dst = append(dst, '}')
|
|
return dst
|
|
}
|
|
|
|
func assertIdenticalTimestamps(tss []*timeseries, step int64) {
|
|
if len(tss) == 0 {
|
|
return
|
|
}
|
|
tsGolden := tss[0]
|
|
if len(tsGolden.Values) != len(tsGolden.Timestamps) {
|
|
logger.Panicf("BUG: len(tsGolden.Values) must match len(tsGolden.Timestamps); got %d vs %d", len(tsGolden.Values), len(tsGolden.Timestamps))
|
|
}
|
|
if len(tsGolden.Timestamps) > 0 {
|
|
prevTimestamp := tsGolden.Timestamps[0]
|
|
for _, timestamp := range tsGolden.Timestamps[1:] {
|
|
if timestamp-prevTimestamp != step {
|
|
logger.Panicf("BUG: invalid step between timestamps; got %d; want %d; tsGolden.Timestamps=%d", timestamp-prevTimestamp, step, tsGolden.Timestamps)
|
|
}
|
|
prevTimestamp = timestamp
|
|
}
|
|
}
|
|
for _, ts := range tss {
|
|
if len(ts.Values) != len(tsGolden.Values) {
|
|
logger.Panicf("BUG: unexpected len(ts.Values); got %d; want %d; ts.Values=%g", len(ts.Values), len(tsGolden.Values), ts.Values)
|
|
}
|
|
if len(ts.Timestamps) != len(tsGolden.Timestamps) {
|
|
logger.Panicf("BUG: unexpected len(ts.Timestamps); got %d; want %d; ts.Timestamps=%d", len(ts.Timestamps), len(tsGolden.Timestamps), ts.Timestamps)
|
|
}
|
|
if len(ts.Timestamps) == 0 {
|
|
continue
|
|
}
|
|
if &ts.Timestamps[0] == &tsGolden.Timestamps[0] {
|
|
// Fast path - shared timestamps.
|
|
continue
|
|
}
|
|
for i := range ts.Timestamps {
|
|
if ts.Timestamps[i] != tsGolden.Timestamps[i] {
|
|
logger.Panicf("BUG: timestamps mismatch at position %d; got %d; want %d; ts.Timestamps=%d, tsGolden.Timestamps=%d",
|
|
i, ts.Timestamps[i], tsGolden.Timestamps[i], ts.Timestamps, tsGolden.Timestamps)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func sortMetricTags(mn *storage.MetricName) {
|
|
mts := (*metricTagsSorter)(mn)
|
|
if !sort.IsSorted(mts) {
|
|
sort.Sort(mts)
|
|
}
|
|
}
|
|
|
|
type metricTagsSorter storage.MetricName
|
|
|
|
func (mts *metricTagsSorter) Len() int {
|
|
return len(mts.Tags)
|
|
}
|
|
|
|
func (mts *metricTagsSorter) Less(i, j int) bool {
|
|
a := mts.Tags
|
|
return string(a[i].Key) < string(a[j].Key)
|
|
}
|
|
|
|
func (mts *metricTagsSorter) Swap(i, j int) {
|
|
a := mts.Tags
|
|
a[i], a[j] = a[j], a[i]
|
|
}
|