prometheus/web/federate.go

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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package web
import (
"fmt"
"net/http"
"sort"
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"github.com/go-kit/kit/log/level"
"github.com/gogo/protobuf/proto"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/expfmt"
"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/pkg/timestamp"
"github.com/prometheus/prometheus/pkg/value"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/promql/parser"
"github.com/prometheus/prometheus/storage"
)
var (
federationErrors = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_web_federation_errors_total",
Help: "Total number of errors that occurred while sending federation responses.",
})
federationWarnings = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_web_federation_warnings_total",
Help: "Total number of warnings that occurred while sending federation responses.",
})
)
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func (h *Handler) federation(w http.ResponseWriter, req *http.Request) {
h.mtx.RLock()
defer h.mtx.RUnlock()
if err := req.ParseForm(); err != nil {
http.Error(w, fmt.Sprintf("error parsing form values: %v", err), http.StatusBadRequest)
return
}
var matcherSets [][]*labels.Matcher
for _, s := range req.Form["match[]"] {
matchers, err := parser.ParseMetricSelector(s)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
matcherSets = append(matcherSets, matchers)
}
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var (
mint = timestamp.FromTime(h.now().Time().Add(-h.lookbackDelta))
maxt = timestamp.FromTime(h.now().Time())
format = expfmt.Negotiate(req.Header)
enc = expfmt.NewEncoder(w, format)
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)
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w.Header().Set("Content-Type", string(format))
q, err := h.storage.Querier(req.Context(), mint, maxt)
if err != nil {
federationErrors.Inc()
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer q.Close()
vec := make(promql.Vector, 0, 8000)
hints := &storage.SelectHints{Start: mint, End: maxt}
var sets []storage.SeriesSet
for _, mset := range matcherSets {
s, wrns, err := q.Select(false, hints, mset...)
if wrns != nil {
level.Debug(h.logger).Log("msg", "federation select returned warnings", "warnings", wrns)
federationWarnings.Add(float64(len(wrns)))
}
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if err != nil {
federationErrors.Inc()
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
sets = append(sets, s)
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}
storage: Added Chunks{Queryable/Querier/SeriesSet/Series/Iteratable. Added generic Merge{SeriesSet/Querier} implementation. (#7005) * storage: Added Chunks{Queryable/Querier/SeriesSet/Series/Iteratable. Added generic Merge{SeriesSet/Querier} implementation. ## Rationales: In many places (e.g. chunk Remote read, Thanos Receive fetching chunk from TSDB), we operate on encoded chunks not samples. This means that we unnecessary decode/encode, wasting CPU, time and memory. This PR adds chunk iterator interfaces and makes the merge code to be reused between both seriesSets I will make the use of it in following PR inside tsdb itself. For now fanout implements it and mergers. All merges now also allows passing series mergers. This opens doors for custom deduplications other than TSDB vertical ones (e.g. offline one we have in Thanos). ## Changes * Added Chunk versions of all iterating methods. It all starts in Querier/ChunkQuerier. The plan is that Storage will implement both chunked and samples. * Added Seek to chunks.Iterator interface for iterating over chunks. * NewMergeChunkQuerier was added; Both this and NewMergeQuerier are now using generigMergeQuerier to share the code. Generic code was added. * Improved tests. * Added some TODO for further simplifications in next PRs. Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com> * Addressed Brian's comments. Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com> * Moved s/Labeled/SeriesLabels as per Krasi suggestion. Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com> * Addressed Krasi's comments. Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com> * Second iteration of Krasi comments. Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com> * Another round of comments. Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
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set := storage.NewMergeSeriesSet(sets, storage.ChainedSeriesMerge)
it := storage.NewBuffer(int64(h.lookbackDelta / 1e6))
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for set.Next() {
s := set.At()
// TODO(fabxc): allow fast path for most recent sample either
// in the storage itself or caching layer in Prometheus.
it.Reset(s.Iterator())
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var t int64
var v float64
ok := it.Seek(maxt)
if ok {
t, v = it.Values()
} else {
t, v, ok = it.PeekBack(1)
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if !ok {
continue
}
}
// The exposition formats do not support stale markers, so drop them. This
// is good enough for staleness handling of federated data, as the
// interval-based limits on staleness will do the right thing for supported
// use cases (which is to say federating aggregated time series).
if value.IsStaleNaN(v) {
continue
}
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vec = append(vec, promql.Sample{
Metric: s.Labels(),
Point: promql.Point{T: t, V: v},
})
}
if set.Err() != nil {
federationErrors.Inc()
http.Error(w, set.Err().Error(), http.StatusInternalServerError)
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return
}
sort.Sort(byName(vec))
externalLabels := h.config.GlobalConfig.ExternalLabels.Map()
if _, ok := externalLabels[model.InstanceLabel]; !ok {
externalLabels[model.InstanceLabel] = ""
}
externalLabelNames := make([]string, 0, len(externalLabels))
for ln := range externalLabels {
externalLabelNames = append(externalLabelNames, ln)
}
sort.Strings(externalLabelNames)
var (
lastMetricName string
protMetricFam *dto.MetricFamily
)
for _, s := range vec {
nameSeen := false
globalUsed := map[string]struct{}{}
protMetric := &dto.Metric{
Untyped: &dto.Untyped{},
}
for _, l := range s.Metric {
if l.Value == "" {
// No value means unset. Never consider those labels.
// This is also important to protect against nameless metrics.
continue
}
if l.Name == labels.MetricName {
nameSeen = true
if l.Value == lastMetricName {
// We already have the name in the current MetricFamily,
// and we ignore nameless metrics.
continue
}
// Need to start a new MetricFamily. Ship off the old one (if any) before
// creating the new one.
if protMetricFam != nil {
if err := enc.Encode(protMetricFam); err != nil {
federationErrors.Inc()
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level.Error(h.logger).Log("msg", "federation failed", "err", err)
return
}
}
protMetricFam = &dto.MetricFamily{
Type: dto.MetricType_UNTYPED.Enum(),
Name: proto.String(l.Value),
}
lastMetricName = l.Value
continue
}
protMetric.Label = append(protMetric.Label, &dto.LabelPair{
Name: proto.String(l.Name),
Value: proto.String(l.Value),
})
if _, ok := externalLabels[l.Name]; ok {
globalUsed[l.Name] = struct{}{}
}
}
if !nameSeen {
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level.Warn(h.logger).Log("msg", "Ignoring nameless metric during federation", "metric", s.Metric)
continue
}
// Attach global labels if they do not exist yet.
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for _, ln := range externalLabelNames {
lv := externalLabels[ln]
if _, ok := globalUsed[string(ln)]; !ok {
protMetric.Label = append(protMetric.Label, &dto.LabelPair{
Name: proto.String(string(ln)),
Value: proto.String(string(lv)),
})
}
}
protMetric.TimestampMs = proto.Int64(s.T)
protMetric.Untyped.Value = proto.Float64(s.V)
protMetricFam.Metric = append(protMetricFam.Metric, protMetric)
}
// Still have to ship off the last MetricFamily, if any.
if protMetricFam != nil {
if err := enc.Encode(protMetricFam); err != nil {
federationErrors.Inc()
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level.Error(h.logger).Log("msg", "federation failed", "err", err)
}
}
}
// byName makes a model.Vector sortable by metric name.
type byName promql.Vector
func (vec byName) Len() int { return len(vec) }
func (vec byName) Swap(i, j int) { vec[i], vec[j] = vec[j], vec[i] }
func (vec byName) Less(i, j int) bool {
ni := vec[i].Metric.Get(labels.MetricName)
nj := vec[j].Metric.Get(labels.MetricName)
return ni < nj
}