prometheus/main.go
Matt T. Proud 4a87c002e8 Update low-level i'faces to reflect wireformats.
This commit fixes a critique of the old storage API design, whereby
the input parameters were always as raw bytes and never Protocol
Buffer messages that encapsulated the data, meaning every place a
read or mutation was conducted needed to manually perform said
translations on its own.  This is taxing.

Change-Id: I4786938d0d207cefb7782bd2bd96a517eead186f
2013-09-04 17:13:58 +02:00

369 lines
11 KiB
Go

// Copyright 2013 Prometheus Team
// 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 main
import (
"flag"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/golang/glog"
"github.com/prometheus/client_golang/extraction"
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/notification"
"github.com/prometheus/prometheus/retrieval"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/storage/metric"
"github.com/prometheus/prometheus/web"
"github.com/prometheus/prometheus/web/api"
)
const deletionBatchSize = 100
// Commandline flags.
var (
configFile = flag.String("configFile", "prometheus.conf", "Prometheus configuration file name.")
metricsStoragePath = flag.String("metricsStoragePath", "/tmp/metrics", "Base path for metrics storage.")
alertmanagerUrl = flag.String("alertmanager.url", "", "The URL of the alert manager to send notifications to.")
samplesQueueCapacity = flag.Int("storage.queue.samplesCapacity", 4096, "The size of the unwritten samples queue.")
diskAppendQueueCapacity = flag.Int("storage.queue.diskAppendCapacity", 1000000, "The size of the queue for items that are pending writing to disk.")
memoryAppendQueueCapacity = flag.Int("storage.queue.memoryAppendCapacity", 10000, "The size of the queue for items that are pending writing to memory.")
headCompactInterval = flag.Duration("compact.headInterval", 3*time.Hour, "The amount of time between head compactions.")
bodyCompactInterval = flag.Duration("compact.bodyInterval", 5*time.Hour, "The amount of time between body compactions.")
tailCompactInterval = flag.Duration("compact.tailInterval", 7*time.Hour, "The amount of time between tail compactions.")
headGroupSize = flag.Int("compact.headGroupSize", 500, "The minimum group size for head samples.")
bodyGroupSize = flag.Int("compact.bodyGroupSize", 5000, "The minimum group size for body samples.")
tailGroupSize = flag.Int("compact.tailGroupSize", 10000, "The minimum group size for tail samples.")
headAge = flag.Duration("compact.headAgeInclusiveness", 5*time.Minute, "The relative inclusiveness of head samples.")
bodyAge = flag.Duration("compact.bodyAgeInclusiveness", time.Hour, "The relative inclusiveness of body samples.")
tailAge = flag.Duration("compact.tailAgeInclusiveness", 24*time.Hour, "The relative inclusiveness of tail samples.")
deleteInterval = flag.Duration("delete.interval", 11*time.Hour, "The amount of time between deletion of old values.")
deleteAge = flag.Duration("delete.ageMaximum", 15*24*time.Hour, "The relative maximum age for values before they are deleted.")
arenaFlushInterval = flag.Duration("arena.flushInterval", 15*time.Minute, "The period at which the in-memory arena is flushed to disk.")
arenaTTL = flag.Duration("arena.ttl", 10*time.Minute, "The relative age of values to purge to disk from memory.")
notificationQueueCapacity = flag.Int("alertmanager.notificationQueueCapacity", 100, "The size of the queue for pending alert manager notifications.")
concurrentRetrievalAllowance = flag.Int("concurrentRetrievalAllowance", 15, "The number of concurrent metrics retrieval requests allowed.")
printVersion = flag.Bool("version", false, "print version information")
)
type prometheus struct {
headCompactionTimer *time.Ticker
bodyCompactionTimer *time.Ticker
tailCompactionTimer *time.Ticker
deletionTimer *time.Ticker
curationSema chan bool
stopBackgroundOperations chan bool
unwrittenSamples chan *extraction.Result
ruleManager rules.RuleManager
notifications chan notification.NotificationReqs
storage *metric.TieredStorage
curationState metric.CurationStateUpdater
}
func (p *prometheus) interruptHandler() {
notifier := make(chan os.Signal)
signal.Notify(notifier, os.Interrupt, syscall.SIGTERM)
<-notifier
glog.Warning("Received SIGINT/SIGTERM; Exiting gracefully...")
p.close()
os.Exit(0)
}
func (p *prometheus) compact(olderThan time.Duration, groupSize int) error {
select {
case p.curationSema <- true:
default:
glog.Warningf("Deferred compaction for %s and %s due to existing operation.", operation, groupSize)
return
}
defer func() {
<-p.curationSema
}()
processor := metric.NewCompactionProcessor(&metric.CompactionProcessorOptions{
MaximumMutationPoolBatch: groupSize * 3,
MinimumGroupSize: groupSize,
})
defer processor.Close()
curator := metric.NewCurator(&metric.CuratorOptions{
Stop: p.stopBackgroundOperations,
ViewQueue: p.storage.ViewQueue,
})
defer curator.Close()
return curator.Run(olderThan, time.Now(), processor, p.storage.DiskStorage.CurationRemarks, p.storage.DiskStorage.MetricSamples, p.storage.DiskStorage.MetricHighWatermarks, p.curationState)
}
func (p *prometheus) delete(olderThan time.Duration, batchSize int) error {
select {
case p.curationSema <- true:
default:
glog.Warningf("Deferred compaction for %s and %s due to existing operation.", operation, groupSize)
return
}
processor := metric.NewDeletionProcessor(&metric.DeletionProcessorOptions{
MaximumMutationPoolBatch: batchSize,
})
defer processor.Close()
curator := metric.NewCurator(&metric.CuratorOptions{
Stop: p.stopBackgroundOperations,
ViewQueue: p.storage.ViewQueue,
})
defer curator.Close()
return curator.Run(olderThan, time.Now(), processor, p.storage.DiskStorage.CurationRemarks, p.storage.DiskStorage.MetricSamples, p.storage.DiskStorage.MetricHighWatermarks, p.curationState)
}
func (p *prometheus) close() {
select {
case p.curationSema <- true:
default:
}
if p.headCompactionTimer != nil {
p.headCompactionTimer.Stop()
}
if p.bodyCompactionTimer != nil {
p.bodyCompactionTimer.Stop()
}
if p.tailCompactionTimer != nil {
p.tailCompactionTimer.Stop()
}
if p.deletionTimer != nil {
p.deletionTimer.Stop()
}
if len(p.stopBackgroundOperations) == 0 {
p.stopBackgroundOperations <- true
}
p.ruleManager.Stop()
p.storage.Close()
close(p.notifications)
close(p.stopBackgroundOperations)
}
func main() {
// TODO(all): Future additions to main should be, where applicable, glumped
// into the prometheus struct above---at least where the scoping of the entire
// server is concerned.
flag.Parse()
versionInfoTmpl.Execute(os.Stdout, BuildInfo)
if *printVersion {
os.Exit(0)
}
conf, err := config.LoadFromFile(*configFile)
if err != nil {
glog.Fatalf("Error loading configuration from %s: %v", *configFile, err)
}
ts, err := metric.NewTieredStorage(uint(*diskAppendQueueCapacity), 100, *arenaFlushInterval, *arenaTTL, *metricsStoragePath)
if err != nil {
glog.Fatal("Error opening storage: ", err)
}
unwrittenSamples := make(chan *extraction.Result, *samplesQueueCapacity)
ingester := &retrieval.MergeLabelsIngester{
Labels: conf.GlobalLabels(),
CollisionPrefix: clientmodel.ExporterLabelPrefix,
Ingester: retrieval.ChannelIngester(unwrittenSamples),
}
// Coprime numbers, fool!
headCompactionTimer := time.NewTicker(*headCompactInterval)
bodyCompactionTimer := time.NewTicker(*bodyCompactInterval)
tailCompactionTimer := time.NewTicker(*tailCompactInterval)
deletionTimer := time.NewTicker(*deleteInterval)
// Queue depth will need to be exposed
targetManager := retrieval.NewTargetManager(ingester, *concurrentRetrievalAllowance)
targetManager.AddTargetsFromConfig(conf)
notifications := make(chan notification.NotificationReqs, *notificationQueueCapacity)
// Queue depth will need to be exposed
ruleManager := rules.NewRuleManager(&rules.RuleManagerOptions{
Results: unwrittenSamples,
Notifications: notifications,
EvaluationInterval: conf.EvaluationInterval(),
Storage: ts,
PrometheusUrl: web.MustBuildServerUrl(),
})
if err := ruleManager.AddRulesFromConfig(conf); err != nil {
glog.Fatal("Error loading rule files: ", err)
}
go ruleManager.Run()
notificationHandler := notification.NewNotificationHandler(*alertmanagerUrl, notifications)
go notificationHandler.Run()
flags := map[string]string{}
flag.VisitAll(func(f *flag.Flag) {
flags[f.Name] = f.Value.String()
})
prometheusStatus := &web.PrometheusStatusHandler{
BuildInfo: BuildInfo,
Config: conf.String(),
RuleManager: ruleManager,
TargetPools: targetManager.Pools(),
Flags: flags,
Birth: time.Now(),
}
alertsHandler := &web.AlertsHandler{
RuleManager: ruleManager,
}
databasesHandler := &web.DatabasesHandler{
Provider: ts.DiskStorage,
RefreshInterval: 5 * time.Minute,
}
metricsService := &api.MetricsService{
Config: &conf,
TargetManager: targetManager,
Storage: ts,
}
webService := &web.WebService{
StatusHandler: prometheusStatus,
MetricsHandler: metricsService,
DatabasesHandler: databasesHandler,
AlertsHandler: alertsHandler,
}
prometheus := &prometheus{
bodyCompactionTimer: bodyCompactionTimer,
headCompactionTimer: headCompactionTimer,
tailCompactionTimer: tailCompactionTimer,
deletionTimer: deletionTimer,
curationState: prometheusStatus,
curationSema: make(chan bool, 1),
unwrittenSamples: unwrittenSamples,
stopBackgroundOperations: make(chan bool, 1),
ruleManager: ruleManager,
notifications: notifications,
storage: ts,
}
defer prometheus.close()
storageStarted := make(chan bool)
go ts.Serve(storageStarted)
<-storageStarted
go prometheus.interruptHandler()
go func() {
for _ = range prometheus.headCompactionTimer.C {
glog.Info("Starting head compaction...")
err := prometheus.compact(*headAge, *headGroupSize)
if err != nil {
glog.Error("could not compact: ", err)
}
glog.Info("Done")
}
}()
go func() {
for _ = range prometheus.bodyCompactionTimer.C {
glog.Info("Starting body compaction...")
err := prometheus.compact(*bodyAge, *bodyGroupSize)
if err != nil {
glog.Error("could not compact: ", err)
}
glog.Info("Done")
}
}()
go func() {
for _ = range prometheus.tailCompactionTimer.C {
glog.Info("Starting tail compaction...")
err := prometheus.compact(*tailAge, *tailGroupSize)
if err != nil {
glog.Error("could not compact: ", err)
}
glog.Info("Done")
}
}()
go func() {
for _ = range prometheus.deletionTimer.C {
glog.Info("Starting deletion of stale values...")
err := prometheus.delete(*deleteAge, deletionBatchSize)
if err != nil {
glog.Error("could not delete: ", err)
}
glog.Info("Done")
}
}()
go func() {
err := webService.ServeForever()
if err != nil {
glog.Fatal(err)
}
}()
// TODO(all): Migrate this into prometheus.serve().
for block := range unwrittenSamples {
if block.Err == nil {
ts.AppendSamples(block.Samples)
}
}
}