mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-26 06:04:05 -08:00
355 lines
11 KiB
Go
355 lines
11 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"flag"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/extraction"
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/notification"
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"github.com/prometheus/prometheus/retrieval"
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"github.com/prometheus/prometheus/rules"
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"github.com/prometheus/prometheus/storage/metric"
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"github.com/prometheus/prometheus/storage/remote"
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"github.com/prometheus/prometheus/storage/remote/opentsdb"
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"github.com/prometheus/prometheus/web"
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"github.com/prometheus/prometheus/web/api"
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)
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const deletionBatchSize = 100
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// Commandline flags.
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var (
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configFile = flag.String("configFile", "prometheus.conf", "Prometheus configuration file name.")
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metricsStoragePath = flag.String("metricsStoragePath", "/tmp/metrics", "Base path for metrics storage.")
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alertmanagerUrl = flag.String("alertmanager.url", "", "The URL of the alert manager to send notifications to.")
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remoteTSDBUrl = flag.String("storage.remote.url", "", "The URL of the OpenTSDB instance to send samples to.")
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remoteTSDBTimeout = flag.Duration("storage.remote.timeout", 30*time.Second, "The timeout to use when sending samples to OpenTSDB.")
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samplesQueueCapacity = flag.Int("storage.queue.samplesCapacity", 4096, "The size of the unwritten samples queue.")
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diskAppendQueueCapacity = flag.Int("storage.queue.diskAppendCapacity", 1000000, "The size of the queue for items that are pending writing to disk.")
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memoryAppendQueueCapacity = flag.Int("storage.queue.memoryAppendCapacity", 10000, "The size of the queue for items that are pending writing to memory.")
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compactInterval = flag.Duration("compact.interval", 3*time.Hour, "The amount of time between compactions.")
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compactGroupSize = flag.Int("compact.groupSize", 500, "The minimum group size for compacted samples.")
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compactAgeInclusiveness = flag.Duration("compact.ageInclusiveness", 5*time.Minute, "The age beyond which samples should be compacted.")
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deleteInterval = flag.Duration("delete.interval", 11*time.Hour, "The amount of time between deletion of old values.")
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deleteAge = flag.Duration("delete.ageMaximum", 15*24*time.Hour, "The relative maximum age for values before they are deleted.")
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arenaFlushInterval = flag.Duration("arena.flushInterval", 15*time.Minute, "The period at which the in-memory arena is flushed to disk.")
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arenaTTL = flag.Duration("arena.ttl", 10*time.Minute, "The relative age of values to purge to disk from memory.")
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notificationQueueCapacity = flag.Int("alertmanager.notificationQueueCapacity", 100, "The size of the queue for pending alert manager notifications.")
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concurrentRetrievalAllowance = flag.Int("concurrentRetrievalAllowance", 15, "The number of concurrent metrics retrieval requests allowed.")
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printVersion = flag.Bool("version", false, "print version information")
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)
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type prometheus struct {
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compactionTimer *time.Ticker
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deletionTimer *time.Ticker
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curationSema chan bool
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stopBackgroundOperations chan bool
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unwrittenSamples chan *extraction.Result
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ruleManager rules.RuleManager
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targetManager retrieval.TargetManager
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notifications chan notification.NotificationReqs
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storage *metric.TieredStorage
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remoteTSDBQueue *remote.TSDBQueueManager
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curationState metric.CurationStateUpdater
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}
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func (p *prometheus) interruptHandler() {
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notifier := make(chan os.Signal)
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signal.Notify(notifier, os.Interrupt, syscall.SIGTERM)
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<-notifier
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glog.Warning("Received SIGINT/SIGTERM; Exiting gracefully...")
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p.close()
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os.Exit(0)
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}
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func (p *prometheus) compact(olderThan time.Duration, groupSize int) error {
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select {
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case p.curationSema <- true:
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default:
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glog.Warningf("Deferred compaction for %s and %s due to existing operation.", olderThan, groupSize)
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return nil
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}
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defer func() {
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<-p.curationSema
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}()
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processor := metric.NewCompactionProcessor(&metric.CompactionProcessorOptions{
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MaximumMutationPoolBatch: groupSize * 3,
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MinimumGroupSize: groupSize,
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})
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defer processor.Close()
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curator := metric.NewCurator(&metric.CuratorOptions{
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Stop: p.stopBackgroundOperations,
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ViewQueue: p.storage.ViewQueue,
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})
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defer curator.Close()
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return curator.Run(olderThan, clientmodel.Now(), processor, p.storage.DiskStorage.CurationRemarks, p.storage.DiskStorage.MetricSamples, p.storage.DiskStorage.MetricHighWatermarks, p.curationState)
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}
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func (p *prometheus) delete(olderThan time.Duration, batchSize int) error {
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select {
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case p.curationSema <- true:
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default:
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glog.Warningf("Deferred deletion for %s due to existing operation.", olderThan)
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return nil
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}
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processor := metric.NewDeletionProcessor(&metric.DeletionProcessorOptions{
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MaximumMutationPoolBatch: batchSize,
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})
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defer processor.Close()
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curator := metric.NewCurator(&metric.CuratorOptions{
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Stop: p.stopBackgroundOperations,
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ViewQueue: p.storage.ViewQueue,
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})
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defer curator.Close()
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return curator.Run(olderThan, clientmodel.Now(), processor, p.storage.DiskStorage.CurationRemarks, p.storage.DiskStorage.MetricSamples, p.storage.DiskStorage.MetricHighWatermarks, p.curationState)
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}
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func (p *prometheus) close() {
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select {
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case p.curationSema <- true:
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default:
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}
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if p.compactionTimer != nil {
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p.compactionTimer.Stop()
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}
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if p.deletionTimer != nil {
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p.deletionTimer.Stop()
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}
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// Stop any currently active curation (deletion or compaction).
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if len(p.stopBackgroundOperations) == 0 {
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p.stopBackgroundOperations <- true
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}
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p.ruleManager.Stop()
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p.targetManager.Stop()
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close(p.unwrittenSamples)
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p.storage.Close()
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if p.remoteTSDBQueue != nil {
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p.remoteTSDBQueue.Close()
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}
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close(p.notifications)
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close(p.stopBackgroundOperations)
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}
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func main() {
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// TODO(all): Future additions to main should be, where applicable, glumped
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// into the prometheus struct above---at least where the scoping of the entire
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// server is concerned.
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flag.Parse()
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versionInfoTmpl.Execute(os.Stdout, BuildInfo)
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if *printVersion {
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os.Exit(0)
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}
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conf, err := config.LoadFromFile(*configFile)
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if err != nil {
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glog.Fatalf("Error loading configuration from %s: %v", *configFile, err)
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}
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ts, err := metric.NewTieredStorage(uint(*diskAppendQueueCapacity), 100, *arenaFlushInterval, *arenaTTL, *metricsStoragePath)
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if err != nil {
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glog.Fatal("Error opening storage: ", err)
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}
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var remoteTSDBQueue *remote.TSDBQueueManager = nil
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if *remoteTSDBUrl == "" {
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glog.Warningf("No TSDB URL provided; not sending any samples to long-term storage")
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} else {
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openTSDB := opentsdb.NewClient(*remoteTSDBUrl, *remoteTSDBTimeout)
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remoteTSDBQueue = remote.NewTSDBQueueManager(openTSDB, 512)
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go remoteTSDBQueue.Run()
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}
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unwrittenSamples := make(chan *extraction.Result, *samplesQueueCapacity)
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ingester := &retrieval.MergeLabelsIngester{
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Labels: conf.GlobalLabels(),
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CollisionPrefix: clientmodel.ExporterLabelPrefix,
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Ingester: retrieval.ChannelIngester(unwrittenSamples),
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}
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compactionTimer := time.NewTicker(*compactInterval)
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deletionTimer := time.NewTicker(*deleteInterval)
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// Queue depth will need to be exposed
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targetManager := retrieval.NewTargetManager(ingester, *concurrentRetrievalAllowance)
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targetManager.AddTargetsFromConfig(conf)
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notifications := make(chan notification.NotificationReqs, *notificationQueueCapacity)
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// Queue depth will need to be exposed
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ruleManager := rules.NewRuleManager(&rules.RuleManagerOptions{
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Results: unwrittenSamples,
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Notifications: notifications,
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EvaluationInterval: conf.EvaluationInterval(),
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Storage: ts,
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PrometheusUrl: web.MustBuildServerUrl(),
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})
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if err := ruleManager.AddRulesFromConfig(conf); err != nil {
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glog.Fatal("Error loading rule files: ", err)
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}
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go ruleManager.Run()
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notificationHandler := notification.NewNotificationHandler(*alertmanagerUrl, notifications)
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go notificationHandler.Run()
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flags := map[string]string{}
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flag.VisitAll(func(f *flag.Flag) {
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flags[f.Name] = f.Value.String()
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})
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prometheusStatus := &web.PrometheusStatusHandler{
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BuildInfo: BuildInfo,
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Config: conf.String(),
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RuleManager: ruleManager,
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TargetPools: targetManager.Pools(),
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Flags: flags,
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Birth: time.Now(),
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}
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alertsHandler := &web.AlertsHandler{
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RuleManager: ruleManager,
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}
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databasesHandler := &web.DatabasesHandler{
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Provider: ts.DiskStorage,
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RefreshInterval: 5 * time.Minute,
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}
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metricsService := &api.MetricsService{
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Config: &conf,
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TargetManager: targetManager,
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Storage: ts,
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}
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webService := &web.WebService{
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StatusHandler: prometheusStatus,
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MetricsHandler: metricsService,
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DatabasesHandler: databasesHandler,
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AlertsHandler: alertsHandler,
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}
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prometheus := &prometheus{
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compactionTimer: compactionTimer,
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deletionTimer: deletionTimer,
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curationState: prometheusStatus,
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curationSema: make(chan bool, 1),
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unwrittenSamples: unwrittenSamples,
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stopBackgroundOperations: make(chan bool, 1),
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ruleManager: ruleManager,
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targetManager: targetManager,
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notifications: notifications,
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storage: ts,
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remoteTSDBQueue: remoteTSDBQueue,
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}
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defer prometheus.close()
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storageStarted := make(chan bool)
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go ts.Serve(storageStarted)
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<-storageStarted
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go prometheus.interruptHandler()
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go func() {
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for _ = range prometheus.compactionTimer.C {
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glog.Info("Starting compaction...")
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err := prometheus.compact(*compactAgeInclusiveness, *compactGroupSize)
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if err != nil {
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glog.Error("could not compact: ", err)
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}
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glog.Info("Done")
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}
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}()
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go func() {
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for _ = range prometheus.deletionTimer.C {
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glog.Info("Starting deletion of stale values...")
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err := prometheus.delete(*deleteAge, deletionBatchSize)
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if err != nil {
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glog.Error("could not delete: ", err)
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}
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glog.Info("Done")
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}
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}()
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go func() {
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err := webService.ServeForever()
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if err != nil {
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glog.Fatal(err)
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}
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}()
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// TODO(all): Migrate this into prometheus.serve().
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for block := range unwrittenSamples {
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if block.Err == nil && len(block.Samples) > 0 {
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ts.AppendSamples(block.Samples)
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if remoteTSDBQueue != nil {
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remoteTSDBQueue.Queue(block.Samples)
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}
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}
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}
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}
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