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flush.go
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flush.go
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package ingester
import (
"bytes"
"fmt"
"net/http"
"sync"
"time"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/model/labels"
"github.com/weaveworks/common/user"
"golang.org/x/net/context"
"github.com/grafana/dskit/tenant"
"github.com/grafana/loki/pkg/chunkenc"
"github.com/grafana/loki/pkg/storage/chunk"
"github.com/grafana/loki/pkg/usagestats"
"github.com/grafana/loki/pkg/util"
loki_util "github.com/grafana/loki/pkg/util"
util_log "github.com/grafana/loki/pkg/util/log"
)
var (
chunkUtilization = promauto.NewHistogram(prometheus.HistogramOpts{
Namespace: "loki",
Name: "ingester_chunk_utilization",
Help: "Distribution of stored chunk utilization (when stored).",
Buckets: prometheus.LinearBuckets(0, 0.2, 6),
})
memoryChunks = promauto.NewGauge(prometheus.GaugeOpts{
Namespace: "loki",
Name: "ingester_memory_chunks",
Help: "The total number of chunks in memory.",
})
chunkEntries = promauto.NewHistogram(prometheus.HistogramOpts{
Namespace: "loki",
Name: "ingester_chunk_entries",
Help: "Distribution of stored lines per chunk (when stored).",
Buckets: prometheus.ExponentialBuckets(200, 2, 9), // biggest bucket is 200*2^(9-1) = 51200
})
chunkSize = promauto.NewHistogram(prometheus.HistogramOpts{
Namespace: "loki",
Name: "ingester_chunk_size_bytes",
Help: "Distribution of stored chunk sizes (when stored).",
Buckets: prometheus.ExponentialBuckets(20000, 2, 10), // biggest bucket is 20000*2^(10-1) = 10,240,000 (~10.2MB)
})
chunkCompressionRatio = promauto.NewHistogram(prometheus.HistogramOpts{
Namespace: "loki",
Name: "ingester_chunk_compression_ratio",
Help: "Compression ratio of chunks (when stored).",
Buckets: prometheus.LinearBuckets(.75, 2, 10),
})
chunksPerTenant = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "ingester_chunks_stored_total",
Help: "Total stored chunks per tenant.",
}, []string{"tenant"})
chunkSizePerTenant = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "ingester_chunk_stored_bytes_total",
Help: "Total bytes stored in chunks per tenant.",
}, []string{"tenant"})
chunkAge = promauto.NewHistogram(prometheus.HistogramOpts{
Namespace: "loki",
Name: "ingester_chunk_age_seconds",
Help: "Distribution of chunk ages (when stored).",
// with default settings chunks should flush between 5 min and 12 hours
// so buckets at 1min, 5min, 10min, 30min, 1hr, 2hr, 4hr, 10hr, 12hr, 16hr
Buckets: []float64{60, 300, 600, 1800, 3600, 7200, 14400, 36000, 43200, 57600},
})
chunkEncodeTime = promauto.NewHistogram(prometheus.HistogramOpts{
Namespace: "loki",
Name: "ingester_chunk_encode_time_seconds",
Help: "Distribution of chunk encode times.",
// 10ms to 10s.
Buckets: prometheus.ExponentialBuckets(0.01, 4, 6),
})
chunksFlushedPerReason = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "ingester_chunks_flushed_total",
Help: "Total flushed chunks per reason.",
}, []string{"reason"})
chunkLifespan = promauto.NewHistogram(prometheus.HistogramOpts{
Namespace: "loki",
Name: "ingester_chunk_bounds_hours",
Help: "Distribution of chunk end-start durations.",
// 1h -> 8hr
Buckets: prometheus.LinearBuckets(1, 1, 8),
})
flushedChunksStats = usagestats.NewCounter("ingester_flushed_chunks")
flushedChunksBytesStats = usagestats.NewStatistics("ingester_flushed_chunks_bytes")
flushedChunksLinesStats = usagestats.NewStatistics("ingester_flushed_chunks_lines")
flushedChunksAgeStats = usagestats.NewStatistics("ingester_flushed_chunks_age_seconds")
flushedChunksLifespanStats = usagestats.NewStatistics("ingester_flushed_chunks_lifespan_seconds")
flushedChunksUtilizationStats = usagestats.NewStatistics("ingester_flushed_chunks_utilization")
)
const (
// Backoff for retrying 'immediate' flushes. Only counts for queue
// position, not wallclock time.
flushBackoff = 1 * time.Second
nameLabel = "__name__"
logsValue = "logs"
flushReasonIdle = "idle"
flushReasonMaxAge = "max_age"
flushReasonForced = "forced"
flushReasonFull = "full"
flushReasonSynced = "synced"
)
// Note: this is called both during the WAL replay (zero or more times)
// and then after replay as well.
func (i *Ingester) InitFlushQueues() {
i.flushQueuesDone.Add(i.cfg.ConcurrentFlushes)
for j := 0; j < i.cfg.ConcurrentFlushes; j++ {
i.flushQueues[j] = util.NewPriorityQueue(flushQueueLength)
go i.flushLoop(j)
}
}
// Flush triggers a flush of all the chunks and closes the flush queues.
// Called from the Lifecycler as part of the ingester shutdown.
func (i *Ingester) Flush() {
i.flush(true)
}
func (i *Ingester) flush(mayRemoveStreams bool) {
i.sweepUsers(true, mayRemoveStreams)
// Close the flush queues, to unblock waiting workers.
for _, flushQueue := range i.flushQueues {
flushQueue.Close()
}
i.flushQueuesDone.Wait()
level.Debug(util_log.Logger).Log("msg", "flush queues have drained")
}
// FlushHandler triggers a flush of all in memory chunks. Mainly used for
// local testing.
func (i *Ingester) FlushHandler(w http.ResponseWriter, _ *http.Request) {
i.sweepUsers(true, true)
w.WriteHeader(http.StatusNoContent)
}
type flushOp struct {
from model.Time
userID string
fp model.Fingerprint
immediate bool
}
func (o *flushOp) Key() string {
return fmt.Sprintf("%s-%s-%v", o.userID, o.fp, o.immediate)
}
func (o *flushOp) Priority() int64 {
return -int64(o.from)
}
// sweepUsers periodically schedules series for flushing and garbage collects users with no series
func (i *Ingester) sweepUsers(immediate, mayRemoveStreams bool) {
instances := i.getInstances()
for _, instance := range instances {
i.sweepInstance(instance, immediate, mayRemoveStreams)
}
}
func (i *Ingester) sweepInstance(instance *instance, immediate, mayRemoveStreams bool) {
_ = instance.streams.ForEach(func(s *stream) (bool, error) {
i.sweepStream(instance, s, immediate)
i.removeFlushedChunks(instance, s, mayRemoveStreams)
return true, nil
})
}
func (i *Ingester) sweepStream(instance *instance, stream *stream, immediate bool) {
stream.chunkMtx.RLock()
defer stream.chunkMtx.RUnlock()
if len(stream.chunks) == 0 {
return
}
lastChunk := stream.chunks[len(stream.chunks)-1]
shouldFlush, _ := i.shouldFlushChunk(&lastChunk)
if len(stream.chunks) == 1 && !immediate && !shouldFlush {
return
}
flushQueueIndex := int(uint64(stream.fp) % uint64(i.cfg.ConcurrentFlushes))
firstTime, _ := stream.chunks[0].chunk.Bounds()
i.flushQueues[flushQueueIndex].Enqueue(&flushOp{
model.TimeFromUnixNano(firstTime.UnixNano()), instance.instanceID,
stream.fp, immediate,
})
}
func (i *Ingester) flushLoop(j int) {
defer func() {
level.Debug(util_log.Logger).Log("msg", "Ingester.flushLoop() exited")
i.flushQueuesDone.Done()
}()
for {
o := i.flushQueues[j].Dequeue()
if o == nil {
return
}
op := o.(*flushOp)
level.Debug(util_log.Logger).Log("msg", "flushing stream", "userid", op.userID, "fp", op.fp, "immediate", op.immediate)
err := i.flushUserSeries(op.userID, op.fp, op.immediate)
if err != nil {
level.Error(util_log.WithUserID(op.userID, util_log.Logger)).Log("msg", "failed to flush user", "err", err)
}
// If we're exiting & we failed to flush, put the failed operation
// back in the queue at a later point.
if op.immediate && err != nil {
op.from = op.from.Add(flushBackoff)
i.flushQueues[j].Enqueue(op)
}
}
}
func (i *Ingester) flushUserSeries(userID string, fp model.Fingerprint, immediate bool) error {
instance, ok := i.getInstanceByID(userID)
if !ok {
return nil
}
chunks, labels, chunkMtx := i.collectChunksToFlush(instance, fp, immediate)
if len(chunks) < 1 {
return nil
}
ctx := user.InjectOrgID(context.Background(), userID)
ctx, cancel := context.WithTimeout(ctx, i.cfg.FlushOpTimeout)
defer cancel()
err := i.flushChunks(ctx, fp, labels, chunks, chunkMtx)
if err != nil {
return err
}
return nil
}
func (i *Ingester) collectChunksToFlush(instance *instance, fp model.Fingerprint, immediate bool) ([]*chunkDesc, labels.Labels, *sync.RWMutex) {
var stream *stream
var ok bool
stream, ok = instance.streams.LoadByFP(fp)
if !ok {
return nil, nil, nil
}
stream.chunkMtx.Lock()
defer stream.chunkMtx.Unlock()
var result []*chunkDesc
for j := range stream.chunks {
shouldFlush, reason := i.shouldFlushChunk(&stream.chunks[j])
if immediate || shouldFlush {
// Ensure no more writes happen to this chunk.
if !stream.chunks[j].closed {
stream.chunks[j].closed = true
}
// Flush this chunk if it hasn't already been successfully flushed.
if stream.chunks[j].flushed.IsZero() {
result = append(result, &stream.chunks[j])
if immediate {
reason = flushReasonForced
}
chunksFlushedPerReason.WithLabelValues(reason).Add(1)
}
}
}
return result, stream.labels, &stream.chunkMtx
}
func (i *Ingester) shouldFlushChunk(chunk *chunkDesc) (bool, string) {
// Append should close the chunk when the a new one is added.
if chunk.closed {
if chunk.synced {
return true, flushReasonSynced
}
return true, flushReasonFull
}
if time.Since(chunk.lastUpdated) > i.cfg.MaxChunkIdle {
return true, flushReasonIdle
}
if from, to := chunk.chunk.Bounds(); to.Sub(from) > i.cfg.MaxChunkAge {
return true, flushReasonMaxAge
}
return false, ""
}
func (i *Ingester) removeFlushedChunks(instance *instance, stream *stream, mayRemoveStream bool) {
now := time.Now()
stream.chunkMtx.Lock()
defer stream.chunkMtx.Unlock()
prevNumChunks := len(stream.chunks)
var subtracted int
for len(stream.chunks) > 0 {
if stream.chunks[0].flushed.IsZero() || now.Sub(stream.chunks[0].flushed) < i.cfg.RetainPeriod {
break
}
subtracted += stream.chunks[0].chunk.UncompressedSize()
stream.chunks[0].chunk = nil // erase reference so the chunk can be garbage-collected
stream.chunks = stream.chunks[1:]
}
memoryChunks.Sub(float64(prevNumChunks - len(stream.chunks)))
// Signal how much data has been flushed to lessen any WAL replay pressure.
i.replayController.Sub(int64(subtracted))
if mayRemoveStream && len(stream.chunks) == 0 {
// Unlock first, then lock inside streams' lock to prevent deadlock
stream.chunkMtx.Unlock()
// Only lock streamsMap when it's needed to remove a stream
instance.streams.WithLock(func() {
stream.chunkMtx.Lock()
// Double check length
if len(stream.chunks) == 0 {
instance.removeStream(stream)
}
})
}
}
func (i *Ingester) flushChunks(ctx context.Context, fp model.Fingerprint, labelPairs labels.Labels, cs []*chunkDesc, chunkMtx sync.Locker) error {
userID, err := tenant.TenantID(ctx)
if err != nil {
return err
}
labelsBuilder := labels.NewBuilder(labelPairs)
labelsBuilder.Set(nameLabel, logsValue)
metric := labelsBuilder.Labels()
wireChunks := make([]chunk.Chunk, len(cs))
// use anonymous function to make lock releasing simpler.
err = func() error {
chunkMtx.Lock()
defer chunkMtx.Unlock()
for j, c := range cs {
// Ensure that new blocks are cut before flushing as data in the head block is not included otherwise.
if err := c.chunk.Close(); err != nil {
return err
}
firstTime, lastTime := loki_util.RoundToMilliseconds(c.chunk.Bounds())
ch := chunk.NewChunk(
userID, fp, metric,
chunkenc.NewFacade(c.chunk, i.cfg.BlockSize, i.cfg.TargetChunkSize),
firstTime,
lastTime,
)
chunkSize := c.chunk.BytesSize() + 4*1024 // size + 4kB should be enough room for cortex header
start := time.Now()
if err := ch.EncodeTo(bytes.NewBuffer(make([]byte, 0, chunkSize))); err != nil {
return err
}
chunkEncodeTime.Observe(time.Since(start).Seconds())
wireChunks[j] = ch
}
return nil
}()
if err != nil {
return err
}
if err := i.store.Put(ctx, wireChunks); err != nil {
return err
}
flushedChunksStats.Inc(int64(len(wireChunks)))
// Record statistics only when actual put request did not return error.
sizePerTenant := chunkSizePerTenant.WithLabelValues(userID)
countPerTenant := chunksPerTenant.WithLabelValues(userID)
chunkMtx.Lock()
defer chunkMtx.Unlock()
for i, wc := range wireChunks {
// flush successful, write while we have lock
cs[i].flushed = time.Now()
numEntries := cs[i].chunk.Size()
byt, err := wc.Encoded()
if err != nil {
continue
}
compressedSize := float64(len(byt))
uncompressedSize, ok := chunkenc.UncompressedSize(wc.Data)
if ok && compressedSize > 0 {
chunkCompressionRatio.Observe(float64(uncompressedSize) / compressedSize)
}
utilization := wc.Data.Utilization()
chunkUtilization.Observe(utilization)
chunkEntries.Observe(float64(numEntries))
chunkSize.Observe(compressedSize)
sizePerTenant.Add(compressedSize)
countPerTenant.Inc()
firstTime, lastTime := cs[i].chunk.Bounds()
chunkAge.Observe(time.Since(firstTime).Seconds())
chunkLifespan.Observe(lastTime.Sub(firstTime).Hours())
flushedChunksBytesStats.Record(compressedSize)
flushedChunksLinesStats.Record(float64(numEntries))
flushedChunksUtilizationStats.Record(utilization)
flushedChunksAgeStats.Record(time.Since(firstTime).Seconds())
flushedChunksLifespanStats.Record(lastTime.Sub(firstTime).Hours())
}
return nil
}