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distributor.go
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distributor.go
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package distributor
import (
"context"
"flag"
"sync/atomic"
"time"
cortex_client "github.com/cortexproject/cortex/pkg/ingester/client"
"github.com/cortexproject/cortex/pkg/ring"
cortex_util "github.com/cortexproject/cortex/pkg/util"
"github.com/cortexproject/cortex/pkg/util/validation"
opentracing "github.com/opentracing/opentracing-go"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/weaveworks/common/user"
"google.golang.org/grpc/health/grpc_health_v1"
"github.com/grafana/loki/pkg/ingester/client"
"github.com/grafana/loki/pkg/logproto"
"github.com/grafana/loki/pkg/util"
)
const metricName = "logs"
var (
ingesterAppends = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "distributor_ingester_appends_total",
Help: "The total number of batch appends sent to ingesters.",
}, []string{"ingester"})
ingesterAppendFailures = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "distributor_ingester_append_failures_total",
Help: "The total number of failed batch appends sent to ingesters.",
}, []string{"ingester"})
bytesIngested = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "distributor_bytes_received_total",
Help: "The total number of uncompressed bytes received per tenant",
}, []string{"tenant"})
linesIngested = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "distributor_lines_received_total",
Help: "The total number of lines received per tenant",
}, []string{"tenant"})
)
// Config for a Distributor.
type Config struct {
// For testing.
factory func(addr string) (grpc_health_v1.HealthClient, error)
}
// RegisterFlags registers the flags.
func (cfg *Config) RegisterFlags(f *flag.FlagSet) {
}
// Distributor coordinates replicates and distribution of log streams.
type Distributor struct {
cfg Config
clientCfg client.Config
ring ring.ReadRing
overrides *validation.Overrides
pool *cortex_client.Pool
}
// New a distributor creates.
func New(cfg Config, clientCfg client.Config, ring ring.ReadRing, overrides *validation.Overrides) (*Distributor, error) {
factory := cfg.factory
if factory == nil {
factory = func(addr string) (grpc_health_v1.HealthClient, error) {
return client.New(clientCfg, addr)
}
}
return &Distributor{
cfg: cfg,
clientCfg: clientCfg,
ring: ring,
overrides: overrides,
pool: cortex_client.NewPool(clientCfg.PoolConfig, ring, factory, cortex_util.Logger),
}, nil
}
// TODO taken from Cortex, see if we can refactor out an usable interface.
type streamTracker struct {
stream *logproto.Stream
minSuccess int
maxFailures int
succeeded int32
failed int32
}
// TODO taken from Cortex, see if we can refactor out an usable interface.
type pushTracker struct {
samplesPending int32
samplesFailed int32
done chan struct{}
err chan error
}
// Push a set of streams.
func (d *Distributor) Push(ctx context.Context, req *logproto.PushRequest) (*logproto.PushResponse, error) {
userID, err := user.ExtractOrgID(ctx)
if err != nil {
return nil, err
}
// Track metrics.
bytesCount := 0
lineCount := 0
for _, stream := range req.Streams {
for _, entry := range stream.Entries {
bytesCount += len(entry.Line)
lineCount++
}
}
bytesIngested.WithLabelValues(userID).Add(float64(bytesCount))
linesIngested.WithLabelValues(userID).Add(float64(lineCount))
// First we flatten out the request into a list of samples.
// We use the heuristic of 1 sample per TS to size the array.
// We also work out the hash value at the same time.
streams := make([]streamTracker, 0, len(req.Streams))
keys := make([]uint32, 0, len(req.Streams))
var validationErr error
for _, stream := range req.Streams {
if err := d.validateLabels(userID, stream.Labels); err != nil {
validationErr = err
continue
}
entries := make([]logproto.Entry, 0, len(stream.Entries))
for _, entry := range stream.Entries {
if err := d.overrides.ValidateSample(userID, metricName, cortex_client.Sample{
TimestampMs: entry.Timestamp.UnixNano() / int64(time.Millisecond),
}); err != nil {
validationErr = err
continue
}
entries = append(entries, entry)
}
if len(entries) == 0 {
continue
}
stream.Entries = entries
keys = append(keys, util.TokenFor(userID, stream.Labels))
streams = append(streams, streamTracker{
stream: stream,
})
}
if len(streams) == 0 {
return &logproto.PushResponse{}, validationErr
}
replicationSets, err := d.ring.BatchGet(keys, ring.Write)
if err != nil {
return nil, err
}
samplesByIngester := map[string][]*streamTracker{}
ingesterDescs := map[string]ring.IngesterDesc{}
for i, replicationSet := range replicationSets {
streams[i].minSuccess = len(replicationSet.Ingesters) - replicationSet.MaxErrors
streams[i].maxFailures = replicationSet.MaxErrors
for _, ingester := range replicationSet.Ingesters {
samplesByIngester[ingester.Addr] = append(samplesByIngester[ingester.Addr], &streams[i])
ingesterDescs[ingester.Addr] = ingester
}
}
tracker := pushTracker{
samplesPending: int32(len(streams)),
done: make(chan struct{}),
err: make(chan error),
}
for ingester, samples := range samplesByIngester {
go func(ingester ring.IngesterDesc, samples []*streamTracker) {
// Use a background context to make sure all ingesters get samples even if we return early
localCtx, cancel := context.WithTimeout(context.Background(), d.clientCfg.RemoteTimeout)
defer cancel()
localCtx = user.InjectOrgID(localCtx, userID)
if sp := opentracing.SpanFromContext(ctx); sp != nil {
localCtx = opentracing.ContextWithSpan(localCtx, sp)
}
d.sendSamples(localCtx, ingester, samples, &tracker)
}(ingesterDescs[ingester], samples)
}
select {
case err := <-tracker.err:
return nil, err
case <-tracker.done:
return &logproto.PushResponse{}, validationErr
case <-ctx.Done():
return nil, ctx.Err()
}
}
func (d *Distributor) validateLabels(userID, labels string) error {
ls, err := util.ToClientLabels(labels)
if err != nil {
return err
}
return d.overrides.ValidateLabels(userID, ls)
}
// TODO taken from Cortex, see if we can refactor out an usable interface.
func (d *Distributor) sendSamples(ctx context.Context, ingester ring.IngesterDesc, streamTrackers []*streamTracker, pushTracker *pushTracker) {
err := d.sendSamplesErr(ctx, ingester, streamTrackers)
// If we succeed, decrement each sample's pending count by one. If we reach
// the required number of successful puts on this sample, then decrement the
// number of pending samples by one. If we successfully push all samples to
// min success ingesters, wake up the waiting rpc so it can return early.
// Similarly, track the number of errors, and if it exceeds maxFailures
// shortcut the waiting rpc.
//
// The use of atomic increments here guarantees only a single sendSamples
// goroutine will write to either channel.
for i := range streamTrackers {
if err != nil {
if atomic.AddInt32(&streamTrackers[i].failed, 1) <= int32(streamTrackers[i].maxFailures) {
continue
}
if atomic.AddInt32(&pushTracker.samplesFailed, 1) == 1 {
pushTracker.err <- err
}
} else {
if atomic.AddInt32(&streamTrackers[i].succeeded, 1) != int32(streamTrackers[i].minSuccess) {
continue
}
if atomic.AddInt32(&pushTracker.samplesPending, -1) == 0 {
pushTracker.done <- struct{}{}
}
}
}
}
// TODO taken from Cortex, see if we can refactor out an usable interface.
func (d *Distributor) sendSamplesErr(ctx context.Context, ingester ring.IngesterDesc, streams []*streamTracker) error {
c, err := d.pool.GetClientFor(ingester.Addr)
if err != nil {
return err
}
req := &logproto.PushRequest{
Streams: make([]*logproto.Stream, len(streams)),
}
for i, s := range streams {
req.Streams[i] = s.stream
}
_, err = c.(logproto.PusherClient).Push(ctx, req)
ingesterAppends.WithLabelValues(ingester.Addr).Inc()
if err != nil {
ingesterAppendFailures.WithLabelValues(ingester.Addr).Inc()
}
return err
}
// Check implements the grpc healthcheck
func (*Distributor) Check(_ context.Context, _ *grpc_health_v1.HealthCheckRequest) (*grpc_health_v1.HealthCheckResponse, error) {
return &grpc_health_v1.HealthCheckResponse{Status: grpc_health_v1.HealthCheckResponse_SERVING}, nil
}