mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-22 08:26:19 +01:00
520 lines
19 KiB
Go
520 lines
19 KiB
Go
package remotewrite
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import (
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"flag"
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"fmt"
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"net/url"
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"strconv"
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"sync"
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"sync/atomic"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/auth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bloomfilter"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/memory"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/persistentqueue"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/tenantmetrics"
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"github.com/VictoriaMetrics/metrics"
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xxhash "github.com/cespare/xxhash/v2"
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)
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var (
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remoteWriteURLs = flagutil.NewArray("remoteWrite.url", "Remote storage URL to write data to. It must support Prometheus remote_write API. "+
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"It is recommended using VictoriaMetrics as remote storage. Example url: http://<victoriametrics-host>:8428/api/v1/write . "+
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"Pass multiple -remoteWrite.url flags in order to replicate data to multiple remote storage systems. See also -remoteWrite.multitenantURL")
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remoteWriteMultitenantURLs = flagutil.NewArray("remoteWrite.multitenantURL", "Base path for multitenant remote storage URL to write data to. "+
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"See https://docs.victoriametrics.com/vmagent.html#multitenancy for details. Example url: http://<vminsert>:8480 . "+
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"Pass multiple -remoteWrite.multitenantURL flags in order to replicate data to multiple remote storage systems. See also -remoteWrite.url")
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tmpDataPath = flag.String("remoteWrite.tmpDataPath", "vmagent-remotewrite-data", "Path to directory where temporary data for remote write component is stored. "+
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"See also -remoteWrite.maxDiskUsagePerURL")
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queues = flag.Int("remoteWrite.queues", cgroup.AvailableCPUs()*2, "The number of concurrent queues to each -remoteWrite.url. Set more queues if default number of queues "+
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"isn't enough for sending high volume of collected data to remote storage. Default value is 2 * numberOfAvailableCPUs")
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showRemoteWriteURL = flag.Bool("remoteWrite.showURL", false, "Whether to show -remoteWrite.url in the exported metrics. "+
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"It is hidden by default, since it can contain sensitive info such as auth key")
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maxPendingBytesPerURL = flagutil.NewBytes("remoteWrite.maxDiskUsagePerURL", 0, "The maximum file-based buffer size in bytes at -remoteWrite.tmpDataPath "+
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"for each -remoteWrite.url. When buffer size reaches the configured maximum, then old data is dropped when adding new data to the buffer. "+
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"Buffered data is stored in ~500MB chunks, so the minimum practical value for this flag is 500000000. "+
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"Disk usage is unlimited if the value is set to 0")
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significantFigures = flagutil.NewArrayInt("remoteWrite.significantFigures", "The number of significant figures to leave in metric values before writing them "+
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"to remote storage. See https://en.wikipedia.org/wiki/Significant_figures . Zero value saves all the significant figures. "+
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"This option may be used for improving data compression for the stored metrics. See also -remoteWrite.roundDigits")
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roundDigits = flagutil.NewArrayInt("remoteWrite.roundDigits", "Round metric values to this number of decimal digits after the point before writing them to remote storage. "+
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"Examples: -remoteWrite.roundDigits=2 would round 1.236 to 1.24, while -remoteWrite.roundDigits=-1 would round 126.78 to 130. "+
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"By default digits rounding is disabled. Set it to 100 for disabling it for a particular remote storage. "+
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"This option may be used for improving data compression for the stored metrics")
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sortLabels = flag.Bool("sortLabels", false, `Whether to sort labels for incoming samples before writing them to all the configured remote storage systems. `+
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`This may be needed for reducing memory usage at remote storage when the order of labels in incoming samples is random. `+
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`For example, if m{k1="v1",k2="v2"} may be sent as m{k2="v2",k1="v1"}`+
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`Enabled sorting for labels can slow down ingestion performance a bit`)
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maxHourlySeries = flag.Int("remoteWrite.maxHourlySeries", 0, "The maximum number of unique series vmagent can send to remote storage systems during the last hour. "+
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"Excess series are logged and dropped. This can be useful for limiting series cardinality. See https://docs.victoriametrics.com/vmagent.html#cardinality-limiter")
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maxDailySeries = flag.Int("remoteWrite.maxDailySeries", 0, "The maximum number of unique series vmagent can send to remote storage systems during the last 24 hours. "+
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"Excess series are logged and dropped. This can be useful for limiting series churn rate. See https://docs.victoriametrics.com/vmagent.html#cardinality-limiter")
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)
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var (
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// rwctxsDefault contains statically populated entries when -remoteWrite.url is specified.
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rwctxsDefault []*remoteWriteCtx
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// rwctxsMap contains dynamically populated entries when -remoteWrite.multitenantURL is specified.
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rwctxsMap = make(map[tenantmetrics.TenantID][]*remoteWriteCtx)
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rwctxsMapLock sync.Mutex
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// Data without tenant id is written to defaultAuthToken if -remoteWrite.multitenantURL is specified.
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defaultAuthToken = &auth.Token{}
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)
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// MultitenancyEnabled returns true if -remoteWrite.multitenantURL is specified.
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func MultitenancyEnabled() bool {
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return len(*remoteWriteMultitenantURLs) > 0
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}
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// Contains the current relabelConfigs.
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var allRelabelConfigs atomic.Value
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// maxQueues limits the maximum value for `-remoteWrite.queues`. There is no sense in setting too high value,
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// since it may lead to high memory usage due to big number of buffers.
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var maxQueues = cgroup.AvailableCPUs() * 16
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// InitSecretFlags must be called after flag.Parse and before any logging.
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func InitSecretFlags() {
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if !*showRemoteWriteURL {
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// remoteWrite.url can contain authentication codes, so hide it at `/metrics` output.
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flagutil.RegisterSecretFlag("remoteWrite.url")
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}
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}
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// Init initializes remotewrite.
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//
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// It must be called after flag.Parse().
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//
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// Stop must be called for graceful shutdown.
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func Init() {
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if len(*remoteWriteURLs) == 0 && len(*remoteWriteMultitenantURLs) == 0 {
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logger.Fatalf("at least one `-remoteWrite.url` or `-remoteWrite.multitenantURL` command-line flag must be set")
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}
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if len(*remoteWriteURLs) > 0 && len(*remoteWriteMultitenantURLs) > 0 {
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logger.Fatalf("cannot set both `-remoteWrite.url` and `-remoteWrite.multitenantURL` command-line flags")
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}
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if *maxHourlySeries > 0 {
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hourlySeriesLimiter = bloomfilter.NewLimiter(*maxHourlySeries, time.Hour)
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_ = metrics.NewGauge(`vmagent_hourly_series_limit_max_series`, func() float64 {
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return float64(hourlySeriesLimiter.MaxItems())
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})
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_ = metrics.NewGauge(`vmagent_hourly_series_limit_current_series`, func() float64 {
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return float64(hourlySeriesLimiter.CurrentItems())
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})
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}
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if *maxDailySeries > 0 {
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dailySeriesLimiter = bloomfilter.NewLimiter(*maxDailySeries, 24*time.Hour)
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_ = metrics.NewGauge(`vmagent_daily_series_limit_max_series`, func() float64 {
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return float64(dailySeriesLimiter.MaxItems())
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})
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_ = metrics.NewGauge(`vmagent_daily_series_limit_current_series`, func() float64 {
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return float64(dailySeriesLimiter.CurrentItems())
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})
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}
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if *queues > maxQueues {
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*queues = maxQueues
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}
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if *queues <= 0 {
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*queues = 1
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}
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initLabelsGlobal()
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// Register SIGHUP handler for config reload before loadRelabelConfigs.
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// This guarantees that the config will be re-read if the signal arrives just after loadRelabelConfig.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1240
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sighupCh := procutil.NewSighupChan()
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rcs, err := loadRelabelConfigs()
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if err != nil {
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logger.Fatalf("cannot load relabel configs: %s", err)
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}
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allRelabelConfigs.Store(rcs)
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if len(*remoteWriteURLs) > 0 {
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rwctxsDefault = newRemoteWriteCtxs(nil, *remoteWriteURLs)
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}
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// Start config reloader.
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configReloaderWG.Add(1)
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go func() {
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defer configReloaderWG.Done()
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for {
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select {
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case <-sighupCh:
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case <-stopCh:
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return
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}
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logger.Infof("SIGHUP received; reloading relabel configs pointed by -remoteWrite.relabelConfig and -remoteWrite.urlRelabelConfig")
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rcs, err := loadRelabelConfigs()
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if err != nil {
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logger.Errorf("cannot reload relabel configs; preserving the previous configs; error: %s", err)
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continue
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}
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allRelabelConfigs.Store(rcs)
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logger.Infof("Successfully reloaded relabel configs")
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}
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}()
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}
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func newRemoteWriteCtxs(at *auth.Token, urls []string) []*remoteWriteCtx {
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if len(urls) == 0 {
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logger.Panicf("BUG: urls must be non-empty")
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}
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maxInmemoryBlocks := memory.Allowed() / len(urls) / *maxRowsPerBlock / 100
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if maxInmemoryBlocks > 400 {
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// There is no much sense in keeping higher number of blocks in memory,
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// since this means that the producer outperforms consumer and the queue
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// will continue growing. It is better storing the queue to file.
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maxInmemoryBlocks = 400
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}
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if maxInmemoryBlocks < 2 {
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maxInmemoryBlocks = 2
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}
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rwctxs := make([]*remoteWriteCtx, len(urls))
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for i, remoteWriteURLRaw := range urls {
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remoteWriteURL, err := url.Parse(remoteWriteURLRaw)
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if err != nil {
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logger.Fatalf("invalid -remoteWrite.url=%q: %s", remoteWriteURL, err)
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}
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sanitizedURL := fmt.Sprintf("%d:secret-url", i+1)
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if at != nil {
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// Construct full remote_write url for the given tenant according to https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#url-format
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remoteWriteURL.Path = fmt.Sprintf("%s/insert/%d:%d/prometheus/api/v1/write", remoteWriteURL.Path, at.AccountID, at.ProjectID)
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sanitizedURL = fmt.Sprintf("%s:%d:%d", sanitizedURL, at.AccountID, at.ProjectID)
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}
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if *showRemoteWriteURL {
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sanitizedURL = fmt.Sprintf("%d:%s", i+1, remoteWriteURL)
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}
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rwctxs[i] = newRemoteWriteCtx(i, at, remoteWriteURL, maxInmemoryBlocks, sanitizedURL)
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}
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return rwctxs
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}
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var stopCh = make(chan struct{})
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var configReloaderWG sync.WaitGroup
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// Stop stops remotewrite.
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//
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// It is expected that nobody calls Push during and after the call to this func.
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func Stop() {
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close(stopCh)
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configReloaderWG.Wait()
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for _, rwctx := range rwctxsDefault {
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rwctx.MustStop()
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}
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rwctxsDefault = nil
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// There is no need in locking rwctxsMapLock here, since nobody should call Push during the Stop call.
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for _, rwctxs := range rwctxsMap {
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for _, rwctx := range rwctxs {
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rwctx.MustStop()
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}
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}
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rwctxsMap = nil
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if sl := hourlySeriesLimiter; sl != nil {
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sl.MustStop()
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}
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if sl := dailySeriesLimiter; sl != nil {
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sl.MustStop()
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}
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}
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// Push sends wr to remote storage systems set via `-remoteWrite.url`.
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//
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// Note that wr may be modified by Push due to relabeling and rounding.
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func Push(wr *prompbmarshal.WriteRequest) {
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PushWithAuthToken(nil, wr)
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}
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// PushWithAuthToken sends wr to remote storage systems set via `-remoteWrite.multitenantURL`.
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//
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// Note that wr may be modified by Push due to relabeling and rounding.
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func PushWithAuthToken(at *auth.Token, wr *prompbmarshal.WriteRequest) {
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if at == nil && len(*remoteWriteMultitenantURLs) > 0 {
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// Write data to default tenant if at isn't set while -remoteWrite.multitenantURL is set.
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at = defaultAuthToken
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}
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var rwctxs []*remoteWriteCtx
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if at == nil {
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rwctxs = rwctxsDefault
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} else {
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if len(*remoteWriteMultitenantURLs) == 0 {
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logger.Panicf("BUG: remoteWriteMultitenantURLs must be non-empty for non-nil at")
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}
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rwctxsMapLock.Lock()
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tenantID := tenantmetrics.TenantID{
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AccountID: at.AccountID,
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ProjectID: at.ProjectID,
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}
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rwctxs = rwctxsMap[tenantID]
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if rwctxs == nil {
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rwctxs = newRemoteWriteCtxs(at, *remoteWriteMultitenantURLs)
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rwctxsMap[tenantID] = rwctxs
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}
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rwctxsMapLock.Unlock()
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}
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var rctx *relabelCtx
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rcs := allRelabelConfigs.Load().(*relabelConfigs)
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pcsGlobal := rcs.global
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if pcsGlobal.Len() > 0 || len(labelsGlobal) > 0 {
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rctx = getRelabelCtx()
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}
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tss := wr.Timeseries
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maxSamplesPerBlock := *maxRowsPerBlock
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// Allow up to 10x of labels per each block on average.
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maxLabelsPerBlock := 10 * maxSamplesPerBlock
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for len(tss) > 0 {
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// Process big tss in smaller blocks in order to reduce the maximum memory usage
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samplesCount := 0
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labelsCount := 0
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i := 0
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for i < len(tss) {
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samplesCount += len(tss[i].Samples)
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labelsCount += len(tss[i].Labels)
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i++
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if samplesCount >= maxSamplesPerBlock || labelsCount >= maxLabelsPerBlock {
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break
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}
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}
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tssBlock := tss
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if i < len(tss) {
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tssBlock = tss[:i]
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tss = tss[i:]
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} else {
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tss = nil
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}
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if rctx != nil {
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tssBlockLen := len(tssBlock)
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tssBlock = rctx.applyRelabeling(tssBlock, labelsGlobal, pcsGlobal)
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globalRelabelMetricsDropped.Add(tssBlockLen - len(tssBlock))
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}
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sortLabelsIfNeeded(tssBlock)
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tssBlock = limitSeriesCardinality(tssBlock)
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pushBlockToRemoteStorages(rwctxs, tssBlock)
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if rctx != nil {
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rctx.reset()
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}
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}
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if rctx != nil {
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putRelabelCtx(rctx)
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}
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}
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func pushBlockToRemoteStorages(rwctxs []*remoteWriteCtx, tssBlock []prompbmarshal.TimeSeries) {
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if len(tssBlock) == 0 {
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// Nothing to push
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return
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}
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// Push block to remote storages in parallel in order to reduce the time needed for sending the data to multiple remote storage systems.
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var wg sync.WaitGroup
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for _, rwctx := range rwctxs {
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wg.Add(1)
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go func(rwctx *remoteWriteCtx) {
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defer wg.Done()
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rwctx.Push(tssBlock)
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}(rwctx)
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}
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wg.Wait()
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}
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// sortLabelsIfNeeded sorts labels if -sortLabels command-line flag is set.
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func sortLabelsIfNeeded(tss []prompbmarshal.TimeSeries) {
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if !*sortLabels {
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return
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}
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for i := range tss {
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promrelabel.SortLabels(tss[i].Labels)
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}
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}
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func limitSeriesCardinality(tss []prompbmarshal.TimeSeries) []prompbmarshal.TimeSeries {
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if hourlySeriesLimiter == nil && dailySeriesLimiter == nil {
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return tss
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}
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dst := make([]prompbmarshal.TimeSeries, 0, len(tss))
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for i := range tss {
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labels := tss[i].Labels
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h := getLabelsHash(labels)
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if hourlySeriesLimiter != nil && !hourlySeriesLimiter.Add(h) {
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hourlySeriesLimitRowsDropped.Add(len(tss[i].Samples))
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logSkippedSeries(labels, "-remoteWrite.maxHourlySeries", hourlySeriesLimiter.MaxItems())
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continue
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}
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if dailySeriesLimiter != nil && !dailySeriesLimiter.Add(h) {
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dailySeriesLimitRowsDropped.Add(len(tss[i].Samples))
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logSkippedSeries(labels, "-remoteWrite.maxDailySeries", dailySeriesLimiter.MaxItems())
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continue
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}
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dst = append(dst, tss[i])
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}
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return dst
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}
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var (
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hourlySeriesLimiter *bloomfilter.Limiter
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dailySeriesLimiter *bloomfilter.Limiter
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hourlySeriesLimitRowsDropped = metrics.NewCounter(`vmagent_hourly_series_limit_rows_dropped_total`)
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dailySeriesLimitRowsDropped = metrics.NewCounter(`vmagent_daily_series_limit_rows_dropped_total`)
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)
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func getLabelsHash(labels []prompbmarshal.Label) uint64 {
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bb := labelsHashBufPool.Get()
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b := bb.B[:0]
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for _, label := range labels {
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b = append(b, label.Name...)
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b = append(b, label.Value...)
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}
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h := xxhash.Sum64(b)
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bb.B = b
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labelsHashBufPool.Put(bb)
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return h
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}
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var labelsHashBufPool bytesutil.ByteBufferPool
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func logSkippedSeries(labels []prompbmarshal.Label, flagName string, flagValue int) {
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select {
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case <-logSkippedSeriesTicker.C:
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logger.Warnf("skip series %s because %s=%d reached", labelsToString(labels), flagName, flagValue)
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default:
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}
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}
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var logSkippedSeriesTicker = time.NewTicker(5 * time.Second)
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func labelsToString(labels []prompbmarshal.Label) string {
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var b []byte
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b = append(b, '{')
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for i, label := range labels {
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b = append(b, label.Name...)
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b = append(b, '=')
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b = strconv.AppendQuote(b, label.Value)
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if i+1 < len(labels) {
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b = append(b, ',')
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}
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}
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b = append(b, '}')
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return string(b)
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}
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var globalRelabelMetricsDropped = metrics.NewCounter("vmagent_remotewrite_global_relabel_metrics_dropped_total")
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type remoteWriteCtx struct {
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idx int
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fq *persistentqueue.FastQueue
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c *client
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pss []*pendingSeries
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pssNextIdx uint64
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relabelMetricsDropped *metrics.Counter
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}
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func newRemoteWriteCtx(argIdx int, at *auth.Token, remoteWriteURL *url.URL, maxInmemoryBlocks int, sanitizedURL string) *remoteWriteCtx {
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// strip query params, otherwise changing params resets pq
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pqURL := *remoteWriteURL
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pqURL.RawQuery = ""
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pqURL.Fragment = ""
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h := xxhash.Sum64([]byte(pqURL.String()))
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queuePath := fmt.Sprintf("%s/persistent-queue/%d_%016X", *tmpDataPath, argIdx+1, h)
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fq := persistentqueue.MustOpenFastQueue(queuePath, sanitizedURL, maxInmemoryBlocks, maxPendingBytesPerURL.N)
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_ = metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_pending_data_bytes{path=%q, url=%q}`, queuePath, sanitizedURL), func() float64 {
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return float64(fq.GetPendingBytes())
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})
|
|
_ = metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_pending_inmemory_blocks{path=%q, url=%q}`, queuePath, sanitizedURL), func() float64 {
|
|
return float64(fq.GetInmemoryQueueLen())
|
|
})
|
|
var c *client
|
|
switch remoteWriteURL.Scheme {
|
|
case "http", "https":
|
|
c = newHTTPClient(argIdx, remoteWriteURL.String(), sanitizedURL, fq, *queues)
|
|
default:
|
|
logger.Fatalf("unsupported scheme: %s for remoteWriteURL: %s, want `http`, `https`", remoteWriteURL.Scheme, sanitizedURL)
|
|
}
|
|
c.init(argIdx, *queues, sanitizedURL)
|
|
|
|
sf := significantFigures.GetOptionalArgOrDefault(argIdx, 0)
|
|
rd := roundDigits.GetOptionalArgOrDefault(argIdx, 100)
|
|
pssLen := *queues
|
|
if n := cgroup.AvailableCPUs(); pssLen > n {
|
|
// There is no sense in running more than availableCPUs concurrent pendingSeries,
|
|
// since every pendingSeries can saturate up to a single CPU.
|
|
pssLen = n
|
|
}
|
|
pss := make([]*pendingSeries, pssLen)
|
|
for i := range pss {
|
|
pss[i] = newPendingSeries(fq.MustWriteBlock, sf, rd)
|
|
}
|
|
return &remoteWriteCtx{
|
|
idx: argIdx,
|
|
fq: fq,
|
|
c: c,
|
|
pss: pss,
|
|
|
|
relabelMetricsDropped: metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_relabel_metrics_dropped_total{path=%q, url=%q}`, queuePath, sanitizedURL)),
|
|
}
|
|
}
|
|
|
|
func (rwctx *remoteWriteCtx) MustStop() {
|
|
for _, ps := range rwctx.pss {
|
|
ps.MustStop()
|
|
}
|
|
rwctx.idx = 0
|
|
rwctx.pss = nil
|
|
rwctx.fq.UnblockAllReaders()
|
|
rwctx.c.MustStop()
|
|
rwctx.c = nil
|
|
rwctx.fq.MustClose()
|
|
rwctx.fq = nil
|
|
|
|
rwctx.relabelMetricsDropped = nil
|
|
}
|
|
|
|
func (rwctx *remoteWriteCtx) Push(tss []prompbmarshal.TimeSeries) {
|
|
var rctx *relabelCtx
|
|
var v *[]prompbmarshal.TimeSeries
|
|
rcs := allRelabelConfigs.Load().(*relabelConfigs)
|
|
pcs := rcs.perURL[rwctx.idx]
|
|
if pcs.Len() > 0 {
|
|
rctx = getRelabelCtx()
|
|
// Make a copy of tss before applying relabeling in order to prevent
|
|
// from affecting time series for other remoteWrite.url configs.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/467
|
|
// and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/599
|
|
v = tssRelabelPool.Get().(*[]prompbmarshal.TimeSeries)
|
|
tss = append(*v, tss...)
|
|
tssLen := len(tss)
|
|
tss = rctx.applyRelabeling(tss, nil, pcs)
|
|
rwctx.relabelMetricsDropped.Add(tssLen - len(tss))
|
|
}
|
|
pss := rwctx.pss
|
|
idx := atomic.AddUint64(&rwctx.pssNextIdx, 1) % uint64(len(pss))
|
|
pss[idx].Push(tss)
|
|
if rctx != nil {
|
|
*v = prompbmarshal.ResetTimeSeries(tss)
|
|
tssRelabelPool.Put(v)
|
|
putRelabelCtx(rctx)
|
|
}
|
|
}
|
|
|
|
var tssRelabelPool = &sync.Pool{
|
|
New: func() interface{} {
|
|
a := []prompbmarshal.TimeSeries{}
|
|
return &a
|
|
},
|
|
}
|