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queue_manager.go
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queue_manager.go
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// Copyright 2013 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 remote
import (
"context"
"errors"
"fmt"
"math"
"strconv"
"sync"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/gogo/protobuf/proto"
"github.com/golang/snappy"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
"go.uber.org/atomic"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/model/histogram"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/model/metadata"
"github.com/prometheus/prometheus/model/relabel"
"github.com/prometheus/prometheus/model/timestamp"
"github.com/prometheus/prometheus/prompb"
writev2 "github.com/prometheus/prometheus/prompb/io/prometheus/write/v2"
"github.com/prometheus/prometheus/scrape"
"github.com/prometheus/prometheus/tsdb/chunks"
"github.com/prometheus/prometheus/tsdb/record"
"github.com/prometheus/prometheus/tsdb/wlog"
)
const (
// We track samples in/out and how long pushes take using an Exponentially
// Weighted Moving Average.
ewmaWeight = 0.2
shardUpdateDuration = 10 * time.Second
// Allow 30% too many shards before scaling down.
shardToleranceFraction = 0.3
reasonTooOld = "too_old"
reasonDroppedSeries = "dropped_series"
reasonUnintentionalDroppedSeries = "unintentionally_dropped_series"
)
type queueManagerMetrics struct {
reg prometheus.Registerer
samplesTotal prometheus.Counter
exemplarsTotal prometheus.Counter
histogramsTotal prometheus.Counter
metadataTotal prometheus.Counter
failedSamplesTotal prometheus.Counter
failedExemplarsTotal prometheus.Counter
failedHistogramsTotal prometheus.Counter
failedMetadataTotal prometheus.Counter
retriedSamplesTotal prometheus.Counter
retriedExemplarsTotal prometheus.Counter
retriedHistogramsTotal prometheus.Counter
retriedMetadataTotal prometheus.Counter
droppedSamplesTotal *prometheus.CounterVec
droppedExemplarsTotal *prometheus.CounterVec
droppedHistogramsTotal *prometheus.CounterVec
enqueueRetriesTotal prometheus.Counter
sentBatchDuration prometheus.Histogram
highestSentTimestamp *maxTimestamp
pendingSamples prometheus.Gauge
pendingExemplars prometheus.Gauge
pendingHistograms prometheus.Gauge
shardCapacity prometheus.Gauge
numShards prometheus.Gauge
maxNumShards prometheus.Gauge
minNumShards prometheus.Gauge
desiredNumShards prometheus.Gauge
sentBytesTotal prometheus.Counter
metadataBytesTotal prometheus.Counter
maxSamplesPerSend prometheus.Gauge
}
func newQueueManagerMetrics(r prometheus.Registerer, rn, e string) *queueManagerMetrics {
m := &queueManagerMetrics{
reg: r,
}
constLabels := prometheus.Labels{
remoteName: rn,
endpoint: e,
}
m.samplesTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "samples_total",
Help: "Total number of samples sent to remote storage.",
ConstLabels: constLabels,
})
m.exemplarsTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "exemplars_total",
Help: "Total number of exemplars sent to remote storage.",
ConstLabels: constLabels,
})
m.histogramsTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "histograms_total",
Help: "Total number of histograms sent to remote storage.",
ConstLabels: constLabels,
})
m.metadataTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "metadata_total",
Help: "Total number of metadata entries sent to remote storage.",
ConstLabels: constLabels,
})
m.failedSamplesTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "samples_failed_total",
Help: "Total number of samples which failed on send to remote storage, non-recoverable errors.",
ConstLabels: constLabels,
})
m.failedExemplarsTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "exemplars_failed_total",
Help: "Total number of exemplars which failed on send to remote storage, non-recoverable errors.",
ConstLabels: constLabels,
})
m.failedHistogramsTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "histograms_failed_total",
Help: "Total number of histograms which failed on send to remote storage, non-recoverable errors.",
ConstLabels: constLabels,
})
m.failedMetadataTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "metadata_failed_total",
Help: "Total number of metadata entries which failed on send to remote storage, non-recoverable errors.",
ConstLabels: constLabels,
})
m.retriedSamplesTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "samples_retried_total",
Help: "Total number of samples which failed on send to remote storage but were retried because the send error was recoverable.",
ConstLabels: constLabels,
})
m.retriedExemplarsTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "exemplars_retried_total",
Help: "Total number of exemplars which failed on send to remote storage but were retried because the send error was recoverable.",
ConstLabels: constLabels,
})
m.retriedHistogramsTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "histograms_retried_total",
Help: "Total number of histograms which failed on send to remote storage but were retried because the send error was recoverable.",
ConstLabels: constLabels,
})
m.retriedMetadataTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "metadata_retried_total",
Help: "Total number of metadata entries which failed on send to remote storage but were retried because the send error was recoverable.",
ConstLabels: constLabels,
})
m.droppedSamplesTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "samples_dropped_total",
Help: "Total number of samples which were dropped after being read from the WAL before being sent via remote write, either via relabelling, due to being too old or unintentionally because of an unknown reference ID.",
ConstLabels: constLabels,
}, []string{"reason"})
m.droppedExemplarsTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "exemplars_dropped_total",
Help: "Total number of exemplars which were dropped after being read from the WAL before being sent via remote write, either via relabelling, due to being too old or unintentionally because of an unknown reference ID.",
ConstLabels: constLabels,
}, []string{"reason"})
m.droppedHistogramsTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "histograms_dropped_total",
Help: "Total number of histograms which were dropped after being read from the WAL before being sent via remote write, either via relabelling, due to being too old or unintentionally because of an unknown reference ID.",
ConstLabels: constLabels,
}, []string{"reason"})
m.enqueueRetriesTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "enqueue_retries_total",
Help: "Total number of times enqueue has failed because a shards queue was full.",
ConstLabels: constLabels,
})
m.sentBatchDuration = prometheus.NewHistogram(prometheus.HistogramOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "sent_batch_duration_seconds",
Help: "Duration of send calls to the remote storage.",
Buckets: append(prometheus.DefBuckets, 25, 60, 120, 300),
ConstLabels: constLabels,
NativeHistogramBucketFactor: 1.1,
NativeHistogramMaxBucketNumber: 100,
NativeHistogramMinResetDuration: 1 * time.Hour,
})
m.highestSentTimestamp = &maxTimestamp{
Gauge: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "queue_highest_sent_timestamp_seconds",
Help: "Timestamp from a WAL sample, the highest timestamp successfully sent by this queue, in seconds since epoch. Initialized to 0 when no data has been sent yet.",
ConstLabels: constLabels,
}),
}
m.pendingSamples = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "samples_pending",
Help: "The number of samples pending in the queues shards to be sent to the remote storage.",
ConstLabels: constLabels,
})
m.pendingExemplars = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "exemplars_pending",
Help: "The number of exemplars pending in the queues shards to be sent to the remote storage.",
ConstLabels: constLabels,
})
m.pendingHistograms = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "histograms_pending",
Help: "The number of histograms pending in the queues shards to be sent to the remote storage.",
ConstLabels: constLabels,
})
m.shardCapacity = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "shard_capacity",
Help: "The capacity of each shard of the queue used for parallel sending to the remote storage.",
ConstLabels: constLabels,
})
m.numShards = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "shards",
Help: "The number of shards used for parallel sending to the remote storage.",
ConstLabels: constLabels,
})
m.maxNumShards = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "shards_max",
Help: "The maximum number of shards that the queue is allowed to run.",
ConstLabels: constLabels,
})
m.minNumShards = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "shards_min",
Help: "The minimum number of shards that the queue is allowed to run.",
ConstLabels: constLabels,
})
m.desiredNumShards = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "shards_desired",
Help: "The number of shards that the queues shard calculation wants to run based on the rate of samples in vs. samples out.",
ConstLabels: constLabels,
})
m.sentBytesTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "bytes_total",
Help: "The total number of bytes of data (not metadata) sent by the queue after compression. Note that when exemplars over remote write is enabled the exemplars included in a remote write request count towards this metric.",
ConstLabels: constLabels,
})
m.metadataBytesTotal = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "metadata_bytes_total",
Help: "The total number of bytes of metadata sent by the queue after compression.",
ConstLabels: constLabels,
})
m.maxSamplesPerSend = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "max_samples_per_send",
Help: "The maximum number of samples to be sent, in a single request, to the remote storage. Note that, when sending of exemplars over remote write is enabled, exemplars count towards this limt.",
ConstLabels: constLabels,
})
return m
}
func (m *queueManagerMetrics) register() {
if m.reg != nil {
m.reg.MustRegister(
m.samplesTotal,
m.exemplarsTotal,
m.histogramsTotal,
m.metadataTotal,
m.failedSamplesTotal,
m.failedExemplarsTotal,
m.failedHistogramsTotal,
m.failedMetadataTotal,
m.retriedSamplesTotal,
m.retriedExemplarsTotal,
m.retriedHistogramsTotal,
m.retriedMetadataTotal,
m.droppedSamplesTotal,
m.droppedExemplarsTotal,
m.droppedHistogramsTotal,
m.enqueueRetriesTotal,
m.sentBatchDuration,
m.highestSentTimestamp,
m.pendingSamples,
m.pendingExemplars,
m.pendingHistograms,
m.shardCapacity,
m.numShards,
m.maxNumShards,
m.minNumShards,
m.desiredNumShards,
m.sentBytesTotal,
m.metadataBytesTotal,
m.maxSamplesPerSend,
)
}
}
func (m *queueManagerMetrics) unregister() {
if m.reg != nil {
m.reg.Unregister(m.samplesTotal)
m.reg.Unregister(m.exemplarsTotal)
m.reg.Unregister(m.histogramsTotal)
m.reg.Unregister(m.metadataTotal)
m.reg.Unregister(m.failedSamplesTotal)
m.reg.Unregister(m.failedExemplarsTotal)
m.reg.Unregister(m.failedHistogramsTotal)
m.reg.Unregister(m.failedMetadataTotal)
m.reg.Unregister(m.retriedSamplesTotal)
m.reg.Unregister(m.retriedExemplarsTotal)
m.reg.Unregister(m.retriedHistogramsTotal)
m.reg.Unregister(m.retriedMetadataTotal)
m.reg.Unregister(m.droppedSamplesTotal)
m.reg.Unregister(m.droppedExemplarsTotal)
m.reg.Unregister(m.droppedHistogramsTotal)
m.reg.Unregister(m.enqueueRetriesTotal)
m.reg.Unregister(m.sentBatchDuration)
m.reg.Unregister(m.highestSentTimestamp)
m.reg.Unregister(m.pendingSamples)
m.reg.Unregister(m.pendingExemplars)
m.reg.Unregister(m.pendingHistograms)
m.reg.Unregister(m.shardCapacity)
m.reg.Unregister(m.numShards)
m.reg.Unregister(m.maxNumShards)
m.reg.Unregister(m.minNumShards)
m.reg.Unregister(m.desiredNumShards)
m.reg.Unregister(m.sentBytesTotal)
m.reg.Unregister(m.metadataBytesTotal)
m.reg.Unregister(m.maxSamplesPerSend)
}
}
// WriteClient defines an interface for sending a batch of samples to an
// external timeseries database.
type WriteClient interface {
// Store stores the given samples in the remote storage.
Store(ctx context.Context, req []byte, retryAttempt int) (WriteResponseStats, error)
// Name uniquely identifies the remote storage.
Name() string
// Endpoint is the remote read or write endpoint for the storage client.
Endpoint() string
}
// QueueManager manages a queue of samples to be sent to the Storage
// indicated by the provided WriteClient. Implements writeTo interface
// used by WAL Watcher.
type QueueManager struct {
lastSendTimestamp atomic.Int64
buildRequestLimitTimestamp atomic.Int64
reshardDisableStartTimestamp atomic.Int64 // Time that reshard was disabled.
reshardDisableEndTimestamp atomic.Int64 // Time that reshard is disabled until.
logger log.Logger
flushDeadline time.Duration
cfg config.QueueConfig
mcfg config.MetadataConfig
externalLabels []labels.Label
relabelConfigs []*relabel.Config
sendExemplars bool
sendNativeHistograms bool
watcher *wlog.Watcher
metadataWatcher *MetadataWatcher
clientMtx sync.RWMutex
storeClient WriteClient
protoMsg config.RemoteWriteProtoMsg
enc Compression
seriesMtx sync.Mutex // Covers seriesLabels, seriesMetadata, droppedSeries and builder.
seriesLabels map[chunks.HeadSeriesRef]labels.Labels
seriesMetadata map[chunks.HeadSeriesRef]*metadata.Metadata
droppedSeries map[chunks.HeadSeriesRef]struct{}
builder *labels.Builder
seriesSegmentMtx sync.Mutex // Covers seriesSegmentIndexes - if you also lock seriesMtx, take seriesMtx first.
seriesSegmentIndexes map[chunks.HeadSeriesRef]int
shards *shards
numShards int
reshardChan chan int
quit chan struct{}
wg sync.WaitGroup
dataIn, dataDropped, dataOut, dataOutDuration *ewmaRate
metrics *queueManagerMetrics
interner *pool
highestRecvTimestamp *maxTimestamp
}
// NewQueueManager builds a new QueueManager and starts a new
// WAL watcher with queue manager as the WriteTo destination.
// The WAL watcher takes the dir parameter as the base directory
// for where the WAL shall be located. Note that the full path to
// the WAL directory will be constructed as <dir>/wal.
func NewQueueManager(
metrics *queueManagerMetrics,
watcherMetrics *wlog.WatcherMetrics,
readerMetrics *wlog.LiveReaderMetrics,
logger log.Logger,
dir string,
samplesIn *ewmaRate,
cfg config.QueueConfig,
mCfg config.MetadataConfig,
externalLabels labels.Labels,
relabelConfigs []*relabel.Config,
client WriteClient,
flushDeadline time.Duration,
interner *pool,
highestRecvTimestamp *maxTimestamp,
sm ReadyScrapeManager,
enableExemplarRemoteWrite bool,
enableNativeHistogramRemoteWrite bool,
protoMsg config.RemoteWriteProtoMsg,
) *QueueManager {
if logger == nil {
logger = log.NewNopLogger()
}
// Copy externalLabels into a slice, which we need for processExternalLabels.
extLabelsSlice := make([]labels.Label, 0, externalLabels.Len())
externalLabels.Range(func(l labels.Label) {
extLabelsSlice = append(extLabelsSlice, l)
})
logger = log.With(logger, remoteName, client.Name(), endpoint, client.Endpoint())
t := &QueueManager{
logger: logger,
flushDeadline: flushDeadline,
cfg: cfg,
mcfg: mCfg,
externalLabels: extLabelsSlice,
relabelConfigs: relabelConfigs,
storeClient: client,
sendExemplars: enableExemplarRemoteWrite,
sendNativeHistograms: enableNativeHistogramRemoteWrite,
seriesLabels: make(map[chunks.HeadSeriesRef]labels.Labels),
seriesMetadata: make(map[chunks.HeadSeriesRef]*metadata.Metadata),
seriesSegmentIndexes: make(map[chunks.HeadSeriesRef]int),
droppedSeries: make(map[chunks.HeadSeriesRef]struct{}),
builder: labels.NewBuilder(labels.EmptyLabels()),
numShards: cfg.MinShards,
reshardChan: make(chan int),
quit: make(chan struct{}),
dataIn: samplesIn,
dataDropped: newEWMARate(ewmaWeight, shardUpdateDuration),
dataOut: newEWMARate(ewmaWeight, shardUpdateDuration),
dataOutDuration: newEWMARate(ewmaWeight, shardUpdateDuration),
metrics: metrics,
interner: interner,
highestRecvTimestamp: highestRecvTimestamp,
protoMsg: protoMsg,
enc: SnappyBlockCompression, // Hardcoded for now, but scaffolding exists for likely future use.
}
walMetadata := false
if t.protoMsg != config.RemoteWriteProtoMsgV1 {
walMetadata = true
}
t.watcher = wlog.NewWatcher(watcherMetrics, readerMetrics, logger, client.Name(), t, dir, enableExemplarRemoteWrite, enableNativeHistogramRemoteWrite, walMetadata)
// The current MetadataWatcher implementation is mutually exclusive
// with the new approach, which stores metadata as WAL records and
// ships them alongside series. If both mechanisms are set, the new one
// takes precedence by implicitly disabling the older one.
if t.mcfg.Send && t.protoMsg != config.RemoteWriteProtoMsgV1 {
level.Warn(logger).Log("msg", "usage of 'metadata_config.send' is redundant when using remote write v2 (or higher) as metadata will always be gathered from the WAL and included for every series within each write request")
t.mcfg.Send = false
}
if t.mcfg.Send {
t.metadataWatcher = NewMetadataWatcher(logger, sm, client.Name(), t, t.mcfg.SendInterval, flushDeadline)
}
t.shards = t.newShards()
return t
}
// AppendWatcherMetadata sends metadata to the remote storage. Metadata is sent in batches, but is not parallelized.
// This is only used for the metadata_config.send setting and 1.x Remote Write.
func (t *QueueManager) AppendWatcherMetadata(ctx context.Context, metadata []scrape.MetricMetadata) {
// no op for any newer proto format, which will cache metadata sent to it from the WAL watcher.
if t.protoMsg != config.RemoteWriteProtoMsgV1 {
return
}
// 1.X will still get metadata in batches.
mm := make([]prompb.MetricMetadata, 0, len(metadata))
for _, entry := range metadata {
mm = append(mm, prompb.MetricMetadata{
MetricFamilyName: entry.Metric,
Help: entry.Help,
Type: prompb.FromMetadataType(entry.Type),
Unit: entry.Unit,
})
}
pBuf := proto.NewBuffer(nil)
numSends := int(math.Ceil(float64(len(metadata)) / float64(t.mcfg.MaxSamplesPerSend)))
for i := 0; i < numSends; i++ {
last := (i + 1) * t.mcfg.MaxSamplesPerSend
if last > len(metadata) {
last = len(metadata)
}
err := t.sendMetadataWithBackoff(ctx, mm[i*t.mcfg.MaxSamplesPerSend:last], pBuf)
if err != nil {
t.metrics.failedMetadataTotal.Add(float64(last - (i * t.mcfg.MaxSamplesPerSend)))
level.Error(t.logger).Log("msg", "non-recoverable error while sending metadata", "count", last-(i*t.mcfg.MaxSamplesPerSend), "err", err)
}
}
}
func (t *QueueManager) sendMetadataWithBackoff(ctx context.Context, metadata []prompb.MetricMetadata, pBuf *proto.Buffer) error {
// Build the WriteRequest with no samples (v1 flow).
req, _, _, err := buildWriteRequest(t.logger, nil, metadata, pBuf, nil, nil, t.enc)
if err != nil {
return err
}
metadataCount := len(metadata)
attemptStore := func(try int) error {
ctx, span := otel.Tracer("").Start(ctx, "Remote Metadata Send Batch")
defer span.End()
span.SetAttributes(
attribute.Int("metadata", metadataCount),
attribute.Int("try", try),
attribute.String("remote_name", t.storeClient.Name()),
attribute.String("remote_url", t.storeClient.Endpoint()),
)
// Attributes defined by OpenTelemetry semantic conventions.
if try > 0 {
span.SetAttributes(semconv.HTTPResendCount(try))
}
begin := time.Now()
// Ignoring WriteResponseStats, because there is nothing for metadata, since it's
// embedded in v2 calls now, and we do v1 here.
_, err := t.storeClient.Store(ctx, req, try)
t.metrics.sentBatchDuration.Observe(time.Since(begin).Seconds())
if err != nil {
span.RecordError(err)
return err
}
return nil
}
retry := func() {
t.metrics.retriedMetadataTotal.Add(float64(len(metadata)))
}
err = t.sendWriteRequestWithBackoff(ctx, attemptStore, retry)
if err != nil {
return err
}
t.metrics.metadataTotal.Add(float64(len(metadata)))
t.metrics.metadataBytesTotal.Add(float64(len(req)))
return nil
}
func isSampleOld(baseTime time.Time, sampleAgeLimit time.Duration, ts int64) bool {
if sampleAgeLimit == 0 {
// If sampleAgeLimit is unset, then we never skip samples due to their age.
return false
}
limitTs := baseTime.Add(-sampleAgeLimit)
sampleTs := timestamp.Time(ts)
return sampleTs.Before(limitTs)
}
func isTimeSeriesOldFilter(metrics *queueManagerMetrics, baseTime time.Time, sampleAgeLimit time.Duration) func(ts prompb.TimeSeries) bool {
return func(ts prompb.TimeSeries) bool {
if sampleAgeLimit == 0 {
// If sampleAgeLimit is unset, then we never skip samples due to their age.
return false
}
switch {
// Only the first element should be set in the series, therefore we only check the first element.
case len(ts.Samples) > 0:
if isSampleOld(baseTime, sampleAgeLimit, ts.Samples[0].Timestamp) {
metrics.droppedSamplesTotal.WithLabelValues(reasonTooOld).Inc()
return true
}
case len(ts.Histograms) > 0:
if isSampleOld(baseTime, sampleAgeLimit, ts.Histograms[0].Timestamp) {
metrics.droppedHistogramsTotal.WithLabelValues(reasonTooOld).Inc()
return true
}
case len(ts.Exemplars) > 0:
if isSampleOld(baseTime, sampleAgeLimit, ts.Exemplars[0].Timestamp) {
metrics.droppedExemplarsTotal.WithLabelValues(reasonTooOld).Inc()
return true
}
default:
return false
}
return false
}
}
func isV2TimeSeriesOldFilter(metrics *queueManagerMetrics, baseTime time.Time, sampleAgeLimit time.Duration) func(ts writev2.TimeSeries) bool {
return func(ts writev2.TimeSeries) bool {
if sampleAgeLimit == 0 {
// If sampleAgeLimit is unset, then we never skip samples due to their age.
return false
}
switch {
// Only the first element should be set in the series, therefore we only check the first element.
case len(ts.Samples) > 0:
if isSampleOld(baseTime, sampleAgeLimit, ts.Samples[0].Timestamp) {
metrics.droppedSamplesTotal.WithLabelValues(reasonTooOld).Inc()
return true
}
case len(ts.Histograms) > 0:
if isSampleOld(baseTime, sampleAgeLimit, ts.Histograms[0].Timestamp) {
metrics.droppedHistogramsTotal.WithLabelValues(reasonTooOld).Inc()
return true
}
case len(ts.Exemplars) > 0:
if isSampleOld(baseTime, sampleAgeLimit, ts.Exemplars[0].Timestamp) {
metrics.droppedExemplarsTotal.WithLabelValues(reasonTooOld).Inc()
return true
}
default:
return false
}
return false
}
}
// Append queues a sample to be sent to the remote storage. Blocks until all samples are
// enqueued on their shards or a shutdown signal is received.
func (t *QueueManager) Append(samples []record.RefSample) bool {
currentTime := time.Now()
outer:
for _, s := range samples {
if isSampleOld(currentTime, time.Duration(t.cfg.SampleAgeLimit), s.T) {
t.metrics.droppedSamplesTotal.WithLabelValues(reasonTooOld).Inc()
continue
}
t.seriesMtx.Lock()
lbls, ok := t.seriesLabels[s.Ref]
if !ok {
t.dataDropped.incr(1)
if _, ok := t.droppedSeries[s.Ref]; !ok {
level.Info(t.logger).Log("msg", "Dropped sample for series that was not explicitly dropped via relabelling", "ref", s.Ref)
t.metrics.droppedSamplesTotal.WithLabelValues(reasonUnintentionalDroppedSeries).Inc()
} else {
t.metrics.droppedSamplesTotal.WithLabelValues(reasonDroppedSeries).Inc()
}
t.seriesMtx.Unlock()
continue
}
// TODO(cstyan): Handle or at least log an error if no metadata is found.
// See https://github.com/prometheus/prometheus/issues/14405
meta := t.seriesMetadata[s.Ref]
t.seriesMtx.Unlock()
// Start with a very small backoff. This should not be t.cfg.MinBackoff
// as it can happen without errors, and we want to pickup work after
// filling a queue/resharding as quickly as possible.
// TODO: Consider using the average duration of a request as the backoff.
backoff := model.Duration(5 * time.Millisecond)
for {
select {
case <-t.quit:
return false
default:
}
if t.shards.enqueue(s.Ref, timeSeries{
seriesLabels: lbls,
metadata: meta,
timestamp: s.T,
value: s.V,
sType: tSample,
}) {
continue outer
}
t.metrics.enqueueRetriesTotal.Inc()
time.Sleep(time.Duration(backoff))
backoff *= 2
// It is reasonable to use t.cfg.MaxBackoff here, as if we have hit
// the full backoff we are likely waiting for external resources.
if backoff > t.cfg.MaxBackoff {
backoff = t.cfg.MaxBackoff
}
}
}
return true
}
func (t *QueueManager) AppendExemplars(exemplars []record.RefExemplar) bool {
if !t.sendExemplars {
return true
}
currentTime := time.Now()
outer:
for _, e := range exemplars {
if isSampleOld(currentTime, time.Duration(t.cfg.SampleAgeLimit), e.T) {
t.metrics.droppedExemplarsTotal.WithLabelValues(reasonTooOld).Inc()
continue
}
t.seriesMtx.Lock()
lbls, ok := t.seriesLabels[e.Ref]
if !ok {
// Track dropped exemplars in the same EWMA for sharding calc.
t.dataDropped.incr(1)
if _, ok := t.droppedSeries[e.Ref]; !ok {
level.Info(t.logger).Log("msg", "Dropped exemplar for series that was not explicitly dropped via relabelling", "ref", e.Ref)
t.metrics.droppedExemplarsTotal.WithLabelValues(reasonUnintentionalDroppedSeries).Inc()
} else {
t.metrics.droppedExemplarsTotal.WithLabelValues(reasonDroppedSeries).Inc()
}
t.seriesMtx.Unlock()
continue
}
meta := t.seriesMetadata[e.Ref]
t.seriesMtx.Unlock()
// This will only loop if the queues are being resharded.
backoff := t.cfg.MinBackoff
for {
select {
case <-t.quit:
return false
default:
}
if t.shards.enqueue(e.Ref, timeSeries{
seriesLabels: lbls,
metadata: meta,
timestamp: e.T,
value: e.V,
exemplarLabels: e.Labels,
sType: tExemplar,
}) {
continue outer
}
t.metrics.enqueueRetriesTotal.Inc()
time.Sleep(time.Duration(backoff))
backoff *= 2
if backoff > t.cfg.MaxBackoff {
backoff = t.cfg.MaxBackoff
}
}
}
return true
}
func (t *QueueManager) AppendHistograms(histograms []record.RefHistogramSample) bool {
if !t.sendNativeHistograms {
return true
}
currentTime := time.Now()
outer:
for _, h := range histograms {
if isSampleOld(currentTime, time.Duration(t.cfg.SampleAgeLimit), h.T) {
t.metrics.droppedHistogramsTotal.WithLabelValues(reasonTooOld).Inc()
continue
}
t.seriesMtx.Lock()
lbls, ok := t.seriesLabels[h.Ref]
if !ok {
t.dataDropped.incr(1)
if _, ok := t.droppedSeries[h.Ref]; !ok {
level.Info(t.logger).Log("msg", "Dropped histogram for series that was not explicitly dropped via relabelling", "ref", h.Ref)
t.metrics.droppedHistogramsTotal.WithLabelValues(reasonUnintentionalDroppedSeries).Inc()
} else {
t.metrics.droppedHistogramsTotal.WithLabelValues(reasonDroppedSeries).Inc()
}
t.seriesMtx.Unlock()
continue
}
meta := t.seriesMetadata[h.Ref]
t.seriesMtx.Unlock()
backoff := model.Duration(5 * time.Millisecond)
for {
select {
case <-t.quit:
return false
default:
}
if t.shards.enqueue(h.Ref, timeSeries{
seriesLabels: lbls,
metadata: meta,
timestamp: h.T,
histogram: h.H,
sType: tHistogram,
}) {
continue outer
}
t.metrics.enqueueRetriesTotal.Inc()
time.Sleep(time.Duration(backoff))
backoff *= 2
if backoff > t.cfg.MaxBackoff {
backoff = t.cfg.MaxBackoff
}
}
}
return true
}
func (t *QueueManager) AppendFloatHistograms(floatHistograms []record.RefFloatHistogramSample) bool {
if !t.sendNativeHistograms {
return true
}
currentTime := time.Now()
outer:
for _, h := range floatHistograms {
if isSampleOld(currentTime, time.Duration(t.cfg.SampleAgeLimit), h.T) {
t.metrics.droppedHistogramsTotal.WithLabelValues(reasonTooOld).Inc()
continue
}
t.seriesMtx.Lock()
lbls, ok := t.seriesLabels[h.Ref]
if !ok {
t.dataDropped.incr(1)
if _, ok := t.droppedSeries[h.Ref]; !ok {
level.Info(t.logger).Log("msg", "Dropped histogram for series that was not explicitly dropped via relabelling", "ref", h.Ref)
t.metrics.droppedHistogramsTotal.WithLabelValues(reasonUnintentionalDroppedSeries).Inc()
} else {
t.metrics.droppedHistogramsTotal.WithLabelValues(reasonDroppedSeries).Inc()
}
t.seriesMtx.Unlock()
continue
}
meta := t.seriesMetadata[h.Ref]
t.seriesMtx.Unlock()
backoff := model.Duration(5 * time.Millisecond)
for {
select {
case <-t.quit:
return false
default:
}
if t.shards.enqueue(h.Ref, timeSeries{
seriesLabels: lbls,
metadata: meta,
timestamp: h.T,
floatHistogram: h.FH,
sType: tFloatHistogram,
}) {
continue outer
}
t.metrics.enqueueRetriesTotal.Inc()
time.Sleep(time.Duration(backoff))
backoff *= 2
if backoff > t.cfg.MaxBackoff {
backoff = t.cfg.MaxBackoff
}
}
}
return true
}
// Start the queue manager sending samples to the remote storage.
// Does not block.
func (t *QueueManager) Start() {
// Register and initialise some metrics.
t.metrics.register()
t.metrics.shardCapacity.Set(float64(t.cfg.Capacity))
t.metrics.maxNumShards.Set(float64(t.cfg.MaxShards))
t.metrics.minNumShards.Set(float64(t.cfg.MinShards))
t.metrics.desiredNumShards.Set(float64(t.cfg.MinShards))
t.metrics.maxSamplesPerSend.Set(float64(t.cfg.MaxSamplesPerSend))
t.shards.start(t.numShards)
t.watcher.Start()
if t.mcfg.Send {
t.metadataWatcher.Start()
}
t.wg.Add(2)
go t.updateShardsLoop()
go t.reshardLoop()
}
// Stop stops sending samples to the remote storage and waits for pending
// sends to complete.
func (t *QueueManager) Stop() {
level.Info(t.logger).Log("msg", "Stopping remote storage...")
defer level.Info(t.logger).Log("msg", "Remote storage stopped.")
close(t.quit)
t.wg.Wait()
// Wait for all QueueManager routines to end before stopping shards, metadata watcher, and WAL watcher. This
// is to ensure we don't end up executing a reshard and shards.stop() at the same time, which
// causes a closed channel panic.
t.shards.stop()
t.watcher.Stop()
if t.mcfg.Send {
t.metadataWatcher.Stop()
}
// On shutdown, release the strings in the labels from the intern pool.
t.seriesMtx.Lock()
for _, labels := range t.seriesLabels {
t.releaseLabels(labels)
}
t.seriesMtx.Unlock()
t.metrics.unregister()
}
// StoreSeries keeps track of which series we know about for lookups when sending samples to remote.
func (t *QueueManager) StoreSeries(series []record.RefSeries, index int) {
t.seriesMtx.Lock()
defer t.seriesMtx.Unlock()
t.seriesSegmentMtx.Lock()
defer t.seriesSegmentMtx.Unlock()
for _, s := range series {
// Just make sure all the Refs of Series will insert into seriesSegmentIndexes map for tracking.
t.seriesSegmentIndexes[s.Ref] = index
t.builder.Reset(s.Labels)
processExternalLabels(t.builder, t.externalLabels)
keep := relabel.ProcessBuilder(t.builder, t.relabelConfigs...)
if !keep {
t.droppedSeries[s.Ref] = struct{}{}
continue
}
lbls := t.builder.Labels()
t.internLabels(lbls)
// We should not ever be replacing a series labels in the map, but just
// in case we do we need to ensure we do not leak the replaced interned
// strings.
if orig, ok := t.seriesLabels[s.Ref]; ok {
t.releaseLabels(orig)
}
t.seriesLabels[s.Ref] = lbls
}
}
// StoreMetadata keeps track of known series' metadata for lookups when sending samples to remote.