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app/vmselect/promql: fix results caching for multi-arg rollup functions such as quantile_over_time

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Previosly only a single arg was taken into account, so caching didn't work properly for multi-arg rollup funcs.
This commit is contained in:
Aliaksandr Valialkin 2020-01-03 20:42:51 +02:00
parent 3d0c7b095a
commit 9a1f6848ca
3 changed files with 51 additions and 59 deletions
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21
app/vmselect/promql/eval.go
View File

@ -164,14 +164,14 @@ func evalExpr(ec *EvalConfig, e metricsql.Expr) ([]*timeseries, error) {
re := &metricsql.RollupExpr{
Expr: me,
}
rv, err := evalRollupFunc(ec, "default_rollup", rollupDefault, re, nil)
rv, err := evalRollupFunc(ec, "default_rollup", rollupDefault, e, re, nil)
if err != nil {
return nil, fmt.Errorf(`cannot evaluate %q: %s`, me.AppendString(nil), err)
}
return rv, nil
}
if re, ok := e.(*metricsql.RollupExpr); ok {
rv, err := evalRollupFunc(ec, "default_rollup", rollupDefault, re, nil)
rv, err := evalRollupFunc(ec, "default_rollup", rollupDefault, e, re, nil)
if err != nil {
return nil, fmt.Errorf(`cannot evaluate %q: %s`, re.AppendString(nil), err)
}
@ -207,7 +207,7 @@ func evalExpr(ec *EvalConfig, e metricsql.Expr) ([]*timeseries, error) {
if err != nil {
return nil, err
}
rv, err := evalRollupFunc(ec, fe.Name, rf, re, nil)
rv, err := evalRollupFunc(ec, fe.Name, rf, e, re, nil)
if err != nil {
return nil, fmt.Errorf(`cannot evaluate %q: %s`, fe.AppendString(nil), err)
}
@ -228,7 +228,7 @@ func evalExpr(ec *EvalConfig, e metricsql.Expr) ([]*timeseries, error) {
return nil, err
}
iafc := newIncrementalAggrFuncContext(ae, callbacks)
return evalRollupFunc(ec, fe.Name, rf, re, iafc)
return evalRollupFunc(ec, fe.Name, rf, e, re, iafc)
}
}
args, err := evalExprs(ec, ae.Args)
@ -409,7 +409,7 @@ func getRollupExprArg(arg metricsql.Expr) *metricsql.RollupExpr {
return &reNew
}
func evalRollupFunc(ec *EvalConfig, name string, rf rollupFunc, re *metricsql.RollupExpr, iafc *incrementalAggrFuncContext) ([]*timeseries, error) {
func evalRollupFunc(ec *EvalConfig, name string, rf rollupFunc, expr metricsql.Expr, re *metricsql.RollupExpr, iafc *incrementalAggrFuncContext) ([]*timeseries, error) {
ecNew := ec
var offset int64
if len(re.Offset) > 0 {
@ -431,7 +431,7 @@ func evalRollupFunc(ec *EvalConfig, name string, rf rollupFunc, re *metricsql.Ro
var rvs []*timeseries
var err error
if me, ok := re.Expr.(*metricsql.MetricExpr); ok {
rvs, err = evalRollupFuncWithMetricExpr(ecNew, name, rf, me, iafc, re.Window)
rvs, err = evalRollupFuncWithMetricExpr(ecNew, name, rf, expr, me, iafc, re.Window)
} else {
if iafc != nil {
logger.Panicf("BUG: iafc must be nil for rollup %q over subquery %q", name, re.AppendString(nil))
@ -456,7 +456,7 @@ func evalRollupFunc(ec *EvalConfig, name string, rf rollupFunc, re *metricsql.Ro
}
func evalRollupFuncWithSubquery(ec *EvalConfig, name string, rf rollupFunc, re *metricsql.RollupExpr) ([]*timeseries, error) {
// Do not use rollupResultCacheV here, since it works only with metricsql.MetricExpr.
// TODO: determine whether to use rollupResultCacheV here.
var step int64
if len(re.Step) > 0 {
var err error
@ -564,7 +564,8 @@ var (
rollupResultCacheMiss = metrics.NewCounter(`vm_rollup_result_cache_miss_total`)
)
func evalRollupFuncWithMetricExpr(ec *EvalConfig, name string, rf rollupFunc, me *metricsql.MetricExpr, iafc *incrementalAggrFuncContext, windowStr string) ([]*timeseries, error) {
func evalRollupFuncWithMetricExpr(ec *EvalConfig, name string, rf rollupFunc,
expr metricsql.Expr, me *metricsql.MetricExpr, iafc *incrementalAggrFuncContext, windowStr string) ([]*timeseries, error) {
if me.IsEmpty() {
return evalNumber(ec, nan), nil
}
@ -578,7 +579,7 @@ func evalRollupFuncWithMetricExpr(ec *EvalConfig, name string, rf rollupFunc, me
}
// Search for partial results in cache.
tssCached, start := rollupResultCacheV.Get(name, ec, me, iafc, window)
tssCached, start := rollupResultCacheV.Get(ec, expr, window)
if start > ec.End {
// The result is fully cached.
rollupResultCacheFullHits.Inc()
@ -657,7 +658,7 @@ func evalRollupFuncWithMetricExpr(ec *EvalConfig, name string, rf rollupFunc, me
}
tss = mergeTimeseries(tssCached, tss, start, ec)
if !isPartial {
rollupResultCacheV.Put(name, ec, me, iafc, window, tss)
rollupResultCacheV.Put(ec, expr, window, tss)
}
return tss, nil
}

27
app/vmselect/promql/rollup_result_cache.go
View File

@ -134,7 +134,7 @@ func ResetRollupResultCache() {
rollupResultCacheV.c.Reset()
}
func (rrc *rollupResultCache) Get(funcName string, ec *EvalConfig, me *metricsql.MetricExpr, iafc *incrementalAggrFuncContext, window int64) (tss []*timeseries, newStart int64) {
func (rrc *rollupResultCache) Get(ec *EvalConfig, expr metricsql.Expr, window int64) (tss []*timeseries, newStart int64) {
if *disableCache || !ec.mayCache() {
return nil, ec.Start
}
@ -143,7 +143,7 @@ func (rrc *rollupResultCache) Get(funcName string, ec *EvalConfig, me *metricsql
bb := bbPool.Get()
defer bbPool.Put(bb)
bb.B = marshalRollupResultCacheKey(bb.B[:0], funcName, ec.AuthToken, me, iafc, window, ec.Step)
bb.B = marshalRollupResultCacheKey(bb.B[:0], ec.AuthToken, expr, window, ec.Step)
metainfoBuf := rrc.c.Get(nil, bb.B)
if len(metainfoBuf) == 0 {
return nil, ec.Start
@ -163,7 +163,7 @@ func (rrc *rollupResultCache) Get(funcName string, ec *EvalConfig, me *metricsql
if len(compressedResultBuf.B) == 0 {
mi.RemoveKey(key)
metainfoBuf = mi.Marshal(metainfoBuf[:0])
bb.B = marshalRollupResultCacheKey(bb.B[:0], funcName, ec.AuthToken, me, iafc, window, ec.Step)
bb.B = marshalRollupResultCacheKey(bb.B[:0], ec.AuthToken, expr, window, ec.Step)
rrc.c.Set(bb.B, metainfoBuf)
return nil, ec.Start
}
@ -215,7 +215,7 @@ func (rrc *rollupResultCache) Get(funcName string, ec *EvalConfig, me *metricsql
var resultBufPool bytesutil.ByteBufferPool
func (rrc *rollupResultCache) Put(funcName string, ec *EvalConfig, me *metricsql.MetricExpr, iafc *incrementalAggrFuncContext, window int64, tss []*timeseries) {
func (rrc *rollupResultCache) Put(ec *EvalConfig, expr metricsql.Expr, window int64, tss []*timeseries) {
if *disableCache || len(tss) == 0 || !ec.mayCache() {
return
}
@ -266,7 +266,7 @@ func (rrc *rollupResultCache) Put(funcName string, ec *EvalConfig, me *metricsql
bb.B = key.Marshal(bb.B[:0])
rrc.c.SetBig(bb.B, compressedResultBuf.B)
bb.B = marshalRollupResultCacheKey(bb.B[:0], funcName, ec.AuthToken, me, iafc, window, ec.Step)
bb.B = marshalRollupResultCacheKey(bb.B[:0], ec.AuthToken, expr, window, ec.Step)
metainfoBuf := rrc.c.Get(nil, bb.B)
var mi rollupResultCacheMetainfo
if len(metainfoBuf) > 0 {
@ -294,26 +294,15 @@ var (
var tooBigRollupResults = metrics.NewCounter("vm_too_big_rollup_results_total")
// Increment this value every time the format of the cache changes.
const rollupResultCacheVersion = 6
const rollupResultCacheVersion = 7
func marshalRollupResultCacheKey(dst []byte, funcName string, at *auth.Token, me *metricsql.MetricExpr, iafc *incrementalAggrFuncContext, window, step int64) []byte {
func marshalRollupResultCacheKey(dst []byte, at *auth.Token, expr metricsql.Expr, 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.MarshalUint32(dst, at.AccountID)
dst = encoding.MarshalUint32(dst, at.ProjectID)
dst = encoding.MarshalUint64(dst, uint64(len(funcName)))
dst = append(dst, funcName...)
dst = encoding.MarshalInt64(dst, window)
dst = encoding.MarshalInt64(dst, step)
tfs := toTagFilters(me.LabelFilters)
for i := range tfs {
dst = tfs[i].Marshal(dst)
}
dst = expr.AppendString(dst)
return dst
}

60
app/vmselect/promql/rollup_result_cache_test.go
View File

@ -10,7 +10,6 @@ import (
func TestRollupResultCache(t *testing.T) {
ResetRollupResultCache()
funcName := "foo"
window := int64(456)
ec := &EvalConfig{
Start: 1000,
@ -30,15 +29,18 @@ func TestRollupResultCache(t *testing.T) {
Value: "xxx",
}},
}
iafc := &incrementalAggrFuncContext{
ae: &metricsql.AggrFuncExpr{
fe := &metricsql.FuncExpr{
Name: "foo",
Args: []metricsql.Expr{me},
}
ae := &metricsql.AggrFuncExpr{
Name: "foobar",
},
Args: []metricsql.Expr{fe},
}
// Try obtaining an empty value.
t.Run("empty", func(t *testing.T) {
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != ec.Start {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, ec.Start)
}
@ -48,7 +50,7 @@ func TestRollupResultCache(t *testing.T) {
})
// Store timeseries overlapping with start
t.Run("start-overlap-no-iafc", func(t *testing.T) {
t.Run("start-overlap-no-ae", func(t *testing.T) {
ResetRollupResultCache()
tss := []*timeseries{
{
@ -56,8 +58,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{0, 1, 2},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 1400 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 1400)
}
@ -69,7 +71,7 @@ func TestRollupResultCache(t *testing.T) {
}
testTimeseriesEqual(t, tss, tssExpected)
})
t.Run("start-overlap-with-iafc", func(t *testing.T) {
t.Run("start-overlap-with-ae", func(t *testing.T) {
ResetRollupResultCache()
tss := []*timeseries{
{
@ -77,8 +79,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{0, 1, 2},
},
}
rollupResultCacheV.Put(funcName, ec, me, iafc, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, iafc, window)
rollupResultCacheV.Put(ec, ae, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, ae, window)
if newStart != 1400 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 1400)
}
@ -100,8 +102,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{333, 0, 1, 2},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 1000 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 1000)
}
@ -119,8 +121,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{0, 1, 2},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 1000 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 1000)
}
@ -138,8 +140,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{0, 1, 2},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 1000 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 1000)
}
@ -157,8 +159,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{0, 1, 2},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 1000 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 1000)
}
@ -176,8 +178,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{0, 1, 2, 3, 4, 5, 6, 7},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 2200 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 2200)
}
@ -199,8 +201,8 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{1, 2, 3, 4, 5, 6},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 2200 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 2200)
}
@ -224,8 +226,8 @@ func TestRollupResultCache(t *testing.T) {
}
tss = append(tss, ts)
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss)
tssResult, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss)
tssResult, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 2200 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 2200)
}
@ -253,10 +255,10 @@ func TestRollupResultCache(t *testing.T) {
Values: []float64{0, 1, 2},
},
}
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss1)
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss2)
rollupResultCacheV.Put(funcName, ec, me, nil, window, tss3)
tss, newStart := rollupResultCacheV.Get(funcName, ec, me, nil, window)
rollupResultCacheV.Put(ec, fe, window, tss1)
rollupResultCacheV.Put(ec, fe, window, tss2)
rollupResultCacheV.Put(ec, fe, window, tss3)
tss, newStart := rollupResultCacheV.Get(ec, fe, window)
if newStart != 1400 {
t.Fatalf("unexpected newStart; got %d; want %d", newStart, 1400)
}