mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
a336bb4e22
Calculate incremental aggregates for `aggr(metric_selector)` function instead of keeping all the time series matching the given `metric_selector` in memory.
509 lines
14 KiB
Go
509 lines
14 KiB
Go
package promql
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"flag"
|
|
"fmt"
|
|
"runtime"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/memory"
|
|
"github.com/VictoriaMetrics/fastcache"
|
|
"github.com/VictoriaMetrics/metrics"
|
|
)
|
|
|
|
var disableCache = flag.Bool("search.disableCache", false, "Whether to disable response caching. This may be useful during data backfilling")
|
|
|
|
var rollupResultCacheV = &rollupResultCache{
|
|
fastcache.New(1024 * 1024), // This is a cache for testing.
|
|
}
|
|
var rollupResultCachePath string
|
|
|
|
func getRollupResultCacheSize() int {
|
|
rollupResultCacheSizeOnce.Do(func() {
|
|
n := memory.Allowed() / 16
|
|
if n <= 0 {
|
|
n = 1024 * 1024
|
|
}
|
|
rollupResultCacheSize = n
|
|
})
|
|
return rollupResultCacheSize
|
|
}
|
|
|
|
var (
|
|
rollupResultCacheSize int
|
|
rollupResultCacheSizeOnce sync.Once
|
|
)
|
|
|
|
// InitRollupResultCache initializes the rollupResult cache
|
|
func InitRollupResultCache(cachePath string) {
|
|
rollupResultCachePath = cachePath
|
|
startTime := time.Now()
|
|
var c *fastcache.Cache
|
|
if len(rollupResultCachePath) > 0 {
|
|
logger.Infof("loading rollupResult cache from %q...", rollupResultCachePath)
|
|
c = fastcache.LoadFromFileOrNew(rollupResultCachePath, getRollupResultCacheSize())
|
|
} else {
|
|
c = fastcache.New(getRollupResultCacheSize())
|
|
}
|
|
if *disableCache {
|
|
c.Reset()
|
|
}
|
|
|
|
stats := &fastcache.Stats{}
|
|
var statsLock sync.Mutex
|
|
var statsLastUpdate time.Time
|
|
fcs := func() *fastcache.Stats {
|
|
statsLock.Lock()
|
|
defer statsLock.Unlock()
|
|
|
|
if time.Since(statsLastUpdate) < time.Second {
|
|
return stats
|
|
}
|
|
var fcs fastcache.Stats
|
|
c.UpdateStats(&fcs)
|
|
stats = &fcs
|
|
statsLastUpdate = time.Now()
|
|
return stats
|
|
}
|
|
if len(rollupResultCachePath) > 0 {
|
|
logger.Infof("loaded rollupResult cache from %q in %s; entriesCount: %d, sizeBytes: %d",
|
|
rollupResultCachePath, time.Since(startTime), fcs().EntriesCount, fcs().BytesSize)
|
|
}
|
|
|
|
metrics.NewGauge(`vm_cache_entries{type="promql/rollupResult"}`, func() float64 {
|
|
return float64(fcs().EntriesCount)
|
|
})
|
|
metrics.NewGauge(`vm_cache_size_bytes{type="promql/rollupResult"}`, func() float64 {
|
|
return float64(fcs().BytesSize)
|
|
})
|
|
metrics.NewGauge(`vm_cache_requests_total{type="promql/rollupResult"}`, func() float64 {
|
|
return float64(fcs().GetCalls)
|
|
})
|
|
metrics.NewGauge(`vm_cache_misses_total{type="promql/rollupResult"}`, func() float64 {
|
|
return float64(fcs().Misses)
|
|
})
|
|
|
|
rollupResultCacheV = &rollupResultCache{
|
|
c: c,
|
|
}
|
|
}
|
|
|
|
// StopRollupResultCache closes the rollupResult cache.
|
|
func StopRollupResultCache() {
|
|
if len(rollupResultCachePath) == 0 {
|
|
rollupResultCacheV.c.Reset()
|
|
return
|
|
}
|
|
gomaxprocs := runtime.GOMAXPROCS(-1)
|
|
logger.Infof("saving rollupResult cache to %q...", rollupResultCachePath)
|
|
startTime := time.Now()
|
|
if err := rollupResultCacheV.c.SaveToFileConcurrent(rollupResultCachePath, gomaxprocs); err != nil {
|
|
logger.Errorf("cannot close rollupResult cache at %q: %s", rollupResultCachePath, err)
|
|
} else {
|
|
var fcs fastcache.Stats
|
|
rollupResultCacheV.c.UpdateStats(&fcs)
|
|
rollupResultCacheV.c.Reset()
|
|
logger.Infof("saved rollupResult cache to %q in %s; entriesCount: %d, sizeBytes: %d",
|
|
rollupResultCachePath, time.Since(startTime), fcs.EntriesCount, fcs.BytesSize)
|
|
}
|
|
}
|
|
|
|
type rollupResultCache struct {
|
|
c *fastcache.Cache
|
|
}
|
|
|
|
var rollupResultCacheResets = metrics.NewCounter(`vm_cache_resets_total{type="promql/rollupResult"}`)
|
|
|
|
// ResetRollupResultCache resets rollup result cache.
|
|
func ResetRollupResultCache() {
|
|
rollupResultCacheResets.Inc()
|
|
rollupResultCacheV.c.Reset()
|
|
}
|
|
|
|
func (rrc *rollupResultCache) Get(funcName string, ec *EvalConfig, me *metricExpr, iafc *incrementalAggrFuncContext, window int64) (tss []*timeseries, newStart int64) {
|
|
if *disableCache || !ec.mayCache() {
|
|
return nil, ec.Start
|
|
}
|
|
|
|
// Obtain tss from the cache.
|
|
bb := bbPool.Get()
|
|
defer bbPool.Put(bb)
|
|
|
|
bb.B = marshalRollupResultCacheKey(bb.B[:0], funcName, me, iafc, window, ec.Step)
|
|
metainfoBuf := rrc.c.Get(nil, bb.B)
|
|
if len(metainfoBuf) == 0 {
|
|
return nil, ec.Start
|
|
}
|
|
var mi rollupResultCacheMetainfo
|
|
if err := mi.Unmarshal(metainfoBuf); err != nil {
|
|
logger.Panicf("BUG: cannot unmarshal rollupResultCacheMetainfo: %s; it looks like it was improperly saved", err)
|
|
}
|
|
key := mi.GetBestKey(ec.Start, ec.End)
|
|
if key.prefix == 0 && key.suffix == 0 {
|
|
return nil, ec.Start
|
|
}
|
|
bb.B = key.Marshal(bb.B[:0])
|
|
resultBuf := rrc.c.GetBig(nil, bb.B)
|
|
if len(resultBuf) == 0 {
|
|
mi.RemoveKey(key)
|
|
metainfoBuf = mi.Marshal(metainfoBuf[:0])
|
|
bb.B = marshalRollupResultCacheKey(bb.B[:0], funcName, me, iafc, window, ec.Step)
|
|
rrc.c.Set(bb.B, metainfoBuf)
|
|
return nil, ec.Start
|
|
}
|
|
tss, err := unmarshalTimeseriesFast(resultBuf)
|
|
if err != nil {
|
|
logger.Panicf("BUG: cannot unmarshal timeseries from rollupResultCache: %s; it looks like it was improperly saved", err)
|
|
}
|
|
|
|
// Extract values for the matching timestamps
|
|
timestamps := tss[0].Timestamps
|
|
i := 0
|
|
for i < len(timestamps) && timestamps[i] < ec.Start {
|
|
i++
|
|
}
|
|
if i == len(timestamps) {
|
|
// no matches.
|
|
return nil, ec.Start
|
|
}
|
|
if timestamps[i] != ec.Start {
|
|
// The cached range doesn't cover the requested range.
|
|
return nil, ec.Start
|
|
}
|
|
|
|
j := len(timestamps) - 1
|
|
for j >= 0 && timestamps[j] > ec.End {
|
|
j--
|
|
}
|
|
j++
|
|
if j <= i {
|
|
// no matches.
|
|
return nil, ec.Start
|
|
}
|
|
|
|
for _, ts := range tss {
|
|
ts.Timestamps = ts.Timestamps[i:j]
|
|
ts.Values = ts.Values[i:j]
|
|
}
|
|
|
|
timestamps = tss[0].Timestamps
|
|
newStart = timestamps[len(timestamps)-1] + ec.Step
|
|
return tss, newStart
|
|
}
|
|
|
|
func (rrc *rollupResultCache) Put(funcName string, ec *EvalConfig, me *metricExpr, iafc *incrementalAggrFuncContext, window int64, tss []*timeseries) {
|
|
if *disableCache || len(tss) == 0 || !ec.mayCache() {
|
|
return
|
|
}
|
|
|
|
// Remove values up to currentTime - step - maxSilenceInterval,
|
|
// since these values may be added later.
|
|
timestamps := tss[0].Timestamps
|
|
deadline := (time.Now().UnixNano() / 1e6) - ec.Step - maxSilenceInterval
|
|
i := len(timestamps) - 1
|
|
for i >= 0 && timestamps[i] > deadline {
|
|
i--
|
|
}
|
|
i++
|
|
if i == 0 {
|
|
// Nothing to store in the cache.
|
|
return
|
|
}
|
|
if i < len(timestamps) {
|
|
timestamps = timestamps[:i]
|
|
// Make a copy of tss and remove unfit values
|
|
rvs := copyTimeseriesShallow(tss)
|
|
for _, ts := range rvs {
|
|
ts.Timestamps = ts.Timestamps[:i]
|
|
ts.Values = ts.Values[:i]
|
|
}
|
|
tss = rvs
|
|
}
|
|
|
|
// Store tss in the cache.
|
|
maxMarshaledSize := getRollupResultCacheSize() / 4
|
|
tssMarshaled := marshalTimeseriesFast(tss, maxMarshaledSize, ec.Step)
|
|
if tssMarshaled == nil {
|
|
tooBigRollupResults.Inc()
|
|
return
|
|
}
|
|
|
|
bb := bbPool.Get()
|
|
defer bbPool.Put(bb)
|
|
|
|
var key rollupResultCacheKey
|
|
key.prefix = rollupResultCacheKeyPrefix
|
|
key.suffix = atomic.AddUint64(&rollupResultCacheKeySuffix, 1)
|
|
bb.B = key.Marshal(bb.B[:0])
|
|
rrc.c.SetBig(bb.B, tssMarshaled)
|
|
|
|
bb.B = marshalRollupResultCacheKey(bb.B[:0], funcName, me, iafc, window, ec.Step)
|
|
metainfoBuf := rrc.c.Get(nil, bb.B)
|
|
var mi rollupResultCacheMetainfo
|
|
if len(metainfoBuf) > 0 {
|
|
if err := mi.Unmarshal(metainfoBuf); err != nil {
|
|
logger.Panicf("BUG: cannot unmarshal rollupResultCacheMetainfo: %s; it looks like it was improperly saved", err)
|
|
}
|
|
}
|
|
mi.AddKey(key, timestamps[0], timestamps[len(timestamps)-1])
|
|
metainfoBuf = mi.Marshal(metainfoBuf[:0])
|
|
rrc.c.Set(bb.B, metainfoBuf)
|
|
}
|
|
|
|
var (
|
|
rollupResultCacheKeyPrefix = func() uint64 {
|
|
var buf [8]byte
|
|
if _, err := rand.Read(buf[:]); err != nil {
|
|
// do not use logger.Panicf, since it isn't initialized yet.
|
|
panic(fmt.Errorf("FATAL: cannot read random data for rollupResultCacheKeyPrefix: %s", err))
|
|
}
|
|
return encoding.UnmarshalUint64(buf[:])
|
|
}()
|
|
rollupResultCacheKeySuffix = uint64(time.Now().UnixNano())
|
|
)
|
|
|
|
var tooBigRollupResults = metrics.NewCounter("vm_too_big_rollup_results_total")
|
|
|
|
// Increment this value every time the format of the cache changes.
|
|
const rollupResultCacheVersion = 5
|
|
|
|
func marshalRollupResultCacheKey(dst []byte, funcName string, me *metricExpr, iafc *incrementalAggrFuncContext, window, step int64) []byte {
|
|
dst = append(dst, rollupResultCacheVersion)
|
|
if iafc == nil {
|
|
dst = append(dst, 0)
|
|
} else {
|
|
dst = append(dst, 1)
|
|
dst = iafc.ae.AppendString(dst)
|
|
}
|
|
dst = encoding.MarshalUint64(dst, uint64(len(funcName)))
|
|
dst = append(dst, funcName...)
|
|
dst = encoding.MarshalInt64(dst, window)
|
|
dst = encoding.MarshalInt64(dst, step)
|
|
for i := range me.TagFilters {
|
|
dst = me.TagFilters[i].Marshal(dst)
|
|
}
|
|
return dst
|
|
}
|
|
|
|
// mergeTimeseries concatenates b with a and returns the result.
|
|
//
|
|
// Preconditions:
|
|
// - a mustn't intersect with b.
|
|
// - a timestamps must be smaller than b timestamps.
|
|
//
|
|
// Postconditions:
|
|
// - a and b cannot be used after returning from the call.
|
|
func mergeTimeseries(a, b []*timeseries, bStart int64, ec *EvalConfig) []*timeseries {
|
|
sharedTimestamps := ec.getSharedTimestamps()
|
|
if bStart == ec.Start {
|
|
// Nothing to merge - b covers all the time range.
|
|
// Verify b is correct.
|
|
for _, tsB := range b {
|
|
tsB.denyReuse = true
|
|
tsB.Timestamps = sharedTimestamps
|
|
if len(tsB.Values) != len(tsB.Timestamps) {
|
|
logger.Panicf("BUG: unexpected number of values in b; got %d; want %d", len(tsB.Values), len(tsB.Timestamps))
|
|
}
|
|
}
|
|
return b
|
|
}
|
|
|
|
m := make(map[string]*timeseries, len(a))
|
|
bb := bbPool.Get()
|
|
defer bbPool.Put(bb)
|
|
for _, ts := range a {
|
|
bb.B = marshalMetricNameSorted(bb.B[:0], &ts.MetricName)
|
|
m[string(bb.B)] = ts
|
|
}
|
|
|
|
rvs := make([]*timeseries, 0, len(a))
|
|
for _, tsB := range b {
|
|
var tmp timeseries
|
|
tmp.denyReuse = true
|
|
tmp.Timestamps = sharedTimestamps
|
|
tmp.Values = make([]float64, 0, len(tmp.Timestamps))
|
|
// Do not use MetricName.CopyFrom for performance reasons.
|
|
// It is safe to make shallow copy, since tsB must no longer used.
|
|
tmp.MetricName = tsB.MetricName
|
|
|
|
bb.B = marshalMetricNameSorted(bb.B[:0], &tsB.MetricName)
|
|
tsA := m[string(bb.B)]
|
|
if tsA == nil {
|
|
tStart := ec.Start
|
|
for tStart < bStart {
|
|
tmp.Values = append(tmp.Values, nan)
|
|
tStart += ec.Step
|
|
}
|
|
} else {
|
|
tmp.Values = append(tmp.Values, tsA.Values...)
|
|
delete(m, string(bb.B))
|
|
}
|
|
tmp.Values = append(tmp.Values, tsB.Values...)
|
|
if len(tmp.Values) != len(tmp.Timestamps) {
|
|
logger.Panicf("BUG: unexpected values after merging new values; got %d; want %d", len(tmp.Values), len(tmp.Timestamps))
|
|
}
|
|
rvs = append(rvs, &tmp)
|
|
}
|
|
|
|
// Copy the remaining timeseries from m.
|
|
for _, tsA := range m {
|
|
var tmp timeseries
|
|
tmp.denyReuse = true
|
|
tmp.Timestamps = sharedTimestamps
|
|
// Do not use MetricName.CopyFrom for performance reasons.
|
|
// It is safe to make shallow copy, since tsA must no longer used.
|
|
tmp.MetricName = tsA.MetricName
|
|
tmp.Values = append(tmp.Values, tsA.Values...)
|
|
|
|
tStart := bStart
|
|
for tStart <= ec.End {
|
|
tmp.Values = append(tmp.Values, nan)
|
|
tStart += ec.Step
|
|
}
|
|
if len(tmp.Values) != len(tmp.Timestamps) {
|
|
logger.Panicf("BUG: unexpected values in the result after adding cached values; got %d; want %d", len(tmp.Values), len(tmp.Timestamps))
|
|
}
|
|
rvs = append(rvs, &tmp)
|
|
}
|
|
return rvs
|
|
}
|
|
|
|
type rollupResultCacheMetainfo struct {
|
|
entries []rollupResultCacheMetainfoEntry
|
|
}
|
|
|
|
func (mi *rollupResultCacheMetainfo) Marshal(dst []byte) []byte {
|
|
dst = encoding.MarshalUint32(dst, uint32(len(mi.entries)))
|
|
for i := range mi.entries {
|
|
dst = mi.entries[i].Marshal(dst)
|
|
}
|
|
return dst
|
|
}
|
|
|
|
func (mi *rollupResultCacheMetainfo) Unmarshal(src []byte) error {
|
|
if len(src) < 4 {
|
|
return fmt.Errorf("cannot unmarshal len(etries) from %d bytes; need at least %d bytes", len(src), 4)
|
|
}
|
|
entriesLen := int(encoding.UnmarshalUint32(src))
|
|
src = src[4:]
|
|
if n := entriesLen - cap(mi.entries); n > 0 {
|
|
mi.entries = append(mi.entries[:cap(mi.entries)], make([]rollupResultCacheMetainfoEntry, n)...)
|
|
}
|
|
mi.entries = mi.entries[:entriesLen]
|
|
for i := 0; i < entriesLen; i++ {
|
|
tail, err := mi.entries[i].Unmarshal(src)
|
|
if err != nil {
|
|
return fmt.Errorf("cannot unmarshal entry #%d: %s", i, err)
|
|
}
|
|
src = tail
|
|
}
|
|
if len(src) > 0 {
|
|
return fmt.Errorf("unexpected non-empty tail left; len(tail)=%d", len(src))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (mi *rollupResultCacheMetainfo) GetBestKey(start, end int64) rollupResultCacheKey {
|
|
if start > end {
|
|
logger.Panicf("BUG: start cannot exceed end; got %d vs %d", start, end)
|
|
}
|
|
var bestKey rollupResultCacheKey
|
|
bestD := int64(1<<63 - 1)
|
|
for i := range mi.entries {
|
|
e := &mi.entries[i]
|
|
if start < e.start || end <= e.start {
|
|
continue
|
|
}
|
|
d := start - e.start
|
|
if d < bestD {
|
|
bestD = d
|
|
bestKey = e.key
|
|
}
|
|
}
|
|
return bestKey
|
|
}
|
|
|
|
func (mi *rollupResultCacheMetainfo) AddKey(key rollupResultCacheKey, start, end int64) {
|
|
if start > end {
|
|
logger.Panicf("BUG: start cannot exceed end; got %d vs %d", start, end)
|
|
}
|
|
mi.entries = append(mi.entries, rollupResultCacheMetainfoEntry{
|
|
start: start,
|
|
end: end,
|
|
key: key,
|
|
})
|
|
if len(mi.entries) > 30 {
|
|
// Remove old entries.
|
|
mi.entries = append(mi.entries[:0], mi.entries[10:]...)
|
|
}
|
|
}
|
|
|
|
func (mi *rollupResultCacheMetainfo) RemoveKey(key rollupResultCacheKey) {
|
|
for i := range mi.entries {
|
|
if mi.entries[i].key == key {
|
|
mi.entries = append(mi.entries[:i], mi.entries[i+1:]...)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
type rollupResultCacheMetainfoEntry struct {
|
|
start int64
|
|
end int64
|
|
key rollupResultCacheKey
|
|
}
|
|
|
|
func (mie *rollupResultCacheMetainfoEntry) Marshal(dst []byte) []byte {
|
|
dst = encoding.MarshalInt64(dst, mie.start)
|
|
dst = encoding.MarshalInt64(dst, mie.end)
|
|
dst = encoding.MarshalUint64(dst, mie.key.prefix)
|
|
dst = encoding.MarshalUint64(dst, mie.key.suffix)
|
|
return dst
|
|
}
|
|
|
|
func (mie *rollupResultCacheMetainfoEntry) Unmarshal(src []byte) ([]byte, error) {
|
|
if len(src) < 8 {
|
|
return src, fmt.Errorf("cannot unmarshal start from %d bytes; need at least %d bytes", len(src), 8)
|
|
}
|
|
mie.start = encoding.UnmarshalInt64(src)
|
|
src = src[8:]
|
|
|
|
if len(src) < 8 {
|
|
return src, fmt.Errorf("cannot unmarshal end from %d bytes; need at least %d bytes", len(src), 8)
|
|
}
|
|
mie.end = encoding.UnmarshalInt64(src)
|
|
src = src[8:]
|
|
|
|
if len(src) < 8 {
|
|
return src, fmt.Errorf("cannot unmarshal key prefix from %d bytes; need at least %d bytes", len(src), 8)
|
|
}
|
|
mie.key.prefix = encoding.UnmarshalUint64(src)
|
|
src = src[8:]
|
|
|
|
if len(src) < 8 {
|
|
return src, fmt.Errorf("cannot unmarshal key suffix from %d bytes; need at least %d bytes", len(src), 8)
|
|
}
|
|
mie.key.suffix = encoding.UnmarshalUint64(src)
|
|
src = src[8:]
|
|
|
|
return src, nil
|
|
}
|
|
|
|
// rollupResultCacheKey must be globally unique across vmselect nodes,
|
|
// so it has prefix and suffix.
|
|
type rollupResultCacheKey struct {
|
|
prefix uint64
|
|
suffix uint64
|
|
}
|
|
|
|
func (k *rollupResultCacheKey) Marshal(dst []byte) []byte {
|
|
dst = append(dst, rollupResultCacheVersion)
|
|
dst = encoding.MarshalUint64(dst, k.prefix)
|
|
dst = encoding.MarshalUint64(dst, k.suffix)
|
|
return dst
|
|
}
|