VictoriaMetrics/app/vmagent/remotewrite/remotewrite.go

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package remotewrite
import (
"flag"
"fmt"
"sync/atomic"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/memory"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/persistentqueue"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
"github.com/VictoriaMetrics/metrics"
xxhash "github.com/cespare/xxhash/v2"
)
var (
remoteWriteURLs = flagutil.NewArray("remoteWrite.url", "Remote storage URL to write data to. It must support Prometheus remote_write API. "+
"It is recommended using VictoriaMetrics as remote storage. Example url: http://<victoriametrics-host>:8428/api/v1/write . "+
"Pass multiple -remoteWrite.url flags in order to write data concurrently to multiple remote storage systems")
relabelConfigPaths = flagutil.NewArray("remoteWrite.urlRelabelConfig", "Optional path to relabel config for the corresponding -remoteWrite.url")
tmpDataPath = flag.String("remoteWrite.tmpDataPath", "vmagent-remotewrite-data", "Path to directory where temporary data for remote write component is stored")
queues = flag.Int("remoteWrite.queues", 1, "The number of concurrent queues to each -remoteWrite.url. Set more queues if a single queue "+
"isn't enough for sending high volume of collected data to remote storage")
showRemoteWriteURL = flag.Bool("remoteWrite.showURL", false, "Whether to show -remoteWrite.url in the exported metrics. "+
"It is hidden by default, since it can contain sensistive auth info")
maxPendingBytesPerURL = flag.Int("remoteWrite.maxDiskUsagePerURL", 0, "The maximum file-based buffer size in bytes at -remoteWrite.tmpDataPath "+
"for each -remoteWrite.url. When buffer size reaches the configured maximum, then old data is dropped when adding new data to the buffer. "+
"Buffered data is stored in ~500MB chunks, so the minimum practical value for this flag is 500000000. "+
"Disk usage is unlimited if the value is set to 0")
)
var rwctxs []*remoteWriteCtx
// Init initializes remotewrite.
//
// It must be called after flag.Parse().
//
// Stop must be called for graceful shutdown.
func Init() {
if len(*remoteWriteURLs) == 0 {
logger.Panicf("FATAL: at least one `-remoteWrite.url` must be set")
}
if !*showRemoteWriteURL {
// remoteWrite.url can contain authentication codes, so hide it at `/metrics` output.
httpserver.RegisterSecretFlag("remoteWrite.url")
}
initRelabelGlobal()
maxInmemoryBlocks := memory.Allowed() / len(*remoteWriteURLs) / maxRowsPerBlock / 100
if maxInmemoryBlocks > 200 {
// There is no much sense in keeping higher number of blocks in memory,
// since this means that the producer outperforms consumer and the queue
// will continue growing. It is better storing the queue to file.
maxInmemoryBlocks = 200
}
if maxInmemoryBlocks < 2 {
maxInmemoryBlocks = 2
}
for i, remoteWriteURL := range *remoteWriteURLs {
relabelConfigPath := ""
if i < len(*relabelConfigPaths) {
relabelConfigPath = (*relabelConfigPaths)[i]
}
urlLabelValue := fmt.Sprintf("secret-url-%d", i+1)
if *showRemoteWriteURL {
urlLabelValue = remoteWriteURL
}
rwctx := newRemoteWriteCtx(remoteWriteURL, relabelConfigPath, maxInmemoryBlocks, urlLabelValue)
rwctxs = append(rwctxs, rwctx)
}
}
// Stop stops remotewrite.
//
// It is expected that nobody calls Push during and after the call to this func.
func Stop() {
for _, rwctx := range rwctxs {
rwctx.MustStop()
}
rwctxs = nil
}
// Push sends wr to remote storage systems set via `-remoteWrite.url`.
//
// Each timeseries in wr.Timeseries must contain one sample.
func Push(wr *prompbmarshal.WriteRequest) {
var rctx *relabelCtx
if len(prcsGlobal) > 0 {
rctx = getRelabelCtx()
}
tss := wr.Timeseries
for len(tss) > 0 {
// Process big tss in smaller blocks in order to reduce maxmimum memory usage
tssBlock := tss
if len(tssBlock) > maxRowsPerBlock {
tssBlock = tss[:maxRowsPerBlock]
tss = tss[maxRowsPerBlock:]
} else {
tss = nil
}
if rctx != nil {
tssBlockLen := len(tssBlock)
tssBlock = rctx.applyRelabeling(tssBlock, labelsGlobal, prcsGlobal)
globalRelabelMetricsDropped.Add(tssBlockLen - len(tssBlock))
}
for _, rwctx := range rwctxs {
rwctx.Push(tssBlock)
}
if rctx != nil {
rctx.reset()
}
}
if rctx != nil {
putRelabelCtx(rctx)
}
}
var globalRelabelMetricsDropped = metrics.NewCounter("vmagent_remotewrite_global_relabel_metrics_dropped_total")
type remoteWriteCtx struct {
fq *persistentqueue.FastQueue
c *client
prcs []promrelabel.ParsedRelabelConfig
pss []*pendingSeries
pssNextIdx uint64
relabelMetricsDropped *metrics.Counter
}
func newRemoteWriteCtx(remoteWriteURL, relabelConfigPath string, maxInmemoryBlocks int, urlLabelValue string) *remoteWriteCtx {
h := xxhash.Sum64([]byte(remoteWriteURL))
path := fmt.Sprintf("%s/persistent-queue/%016X", *tmpDataPath, h)
fq := persistentqueue.MustOpenFastQueue(path, remoteWriteURL, maxInmemoryBlocks, *maxPendingBytesPerURL)
_ = metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_pending_data_bytes{path=%q, url=%q}`, path, urlLabelValue), func() float64 {
return float64(fq.GetPendingBytes())
})
_ = metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_pending_inmemory_blocks{path=%q, url=%q}`, path, urlLabelValue), func() float64 {
return float64(fq.GetInmemoryQueueLen())
})
c := newClient(remoteWriteURL, urlLabelValue, fq, *queues)
var prcs []promrelabel.ParsedRelabelConfig
if len(relabelConfigPath) > 0 {
var err error
prcs, err = promrelabel.LoadRelabelConfigs(relabelConfigPath)
if err != nil {
logger.Panicf("FATAL: cannot load relabel configs from -remoteWrite.urlRelabelConfig=%q: %s", relabelConfigPath, err)
}
}
pss := make([]*pendingSeries, *queues)
for i := range pss {
pss[i] = newPendingSeries(fq.MustWriteBlock)
}
return &remoteWriteCtx{
fq: fq,
c: c,
prcs: prcs,
pss: pss,
relabelMetricsDropped: metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_relabel_metrics_dropped_total{path=%q, url=%q}`, path, urlLabelValue)),
}
}
func (rwctx *remoteWriteCtx) MustStop() {
for _, ps := range rwctx.pss {
ps.MustStop()
}
rwctx.pss = nil
rwctx.fq.MustClose()
rwctx.fq = nil
rwctx.prcs = nil
rwctx.c.MustStop()
rwctx.c = nil
rwctx.relabelMetricsDropped = nil
}
func (rwctx *remoteWriteCtx) Push(tss []prompbmarshal.TimeSeries) {
var rctx *relabelCtx
if len(rwctx.prcs) > 0 {
rctx = getRelabelCtx()
tssLen := len(tss)
tss = rctx.applyRelabeling(tss, nil, rwctx.prcs)
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 {
putRelabelCtx(rctx)
}
}