/
ingester_querier.go
427 lines (353 loc) · 13.2 KB
/
ingester_querier.go
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package querier
import (
"context"
"net/http"
"strings"
"time"
"golang.org/x/exp/slices"
"github.com/grafana/loki/v3/pkg/storage/stores/index/seriesvolume"
"github.com/gogo/status"
"github.com/grafana/dskit/httpgrpc"
"github.com/grafana/dskit/ring"
ring_client "github.com/grafana/dskit/ring/client"
"github.com/grafana/dskit/services"
"github.com/pkg/errors"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/model/labels"
"google.golang.org/grpc/codes"
"github.com/grafana/loki/v3/pkg/distributor/clientpool"
"github.com/grafana/loki/v3/pkg/ingester/client"
"github.com/grafana/loki/v3/pkg/iter"
"github.com/grafana/loki/v3/pkg/logproto"
"github.com/grafana/loki/v3/pkg/logql"
"github.com/grafana/loki/v3/pkg/logql/syntax"
"github.com/grafana/loki/v3/pkg/logqlmodel/stats"
index_stats "github.com/grafana/loki/v3/pkg/storage/stores/index/stats"
util_log "github.com/grafana/loki/v3/pkg/util/log"
)
type responseFromIngesters struct {
addr string
response interface{}
}
// IngesterQuerier helps with querying the ingesters.
type IngesterQuerier struct {
ring ring.ReadRing
pool *ring_client.Pool
extraQueryDelay time.Duration
}
func NewIngesterQuerier(clientCfg client.Config, ring ring.ReadRing, extraQueryDelay time.Duration, metricsNamespace string) (*IngesterQuerier, error) {
factory := func(addr string) (ring_client.PoolClient, error) {
return client.New(clientCfg, addr)
}
return newIngesterQuerier(clientCfg, ring, extraQueryDelay, ring_client.PoolAddrFunc(factory), metricsNamespace)
}
// newIngesterQuerier creates a new IngesterQuerier and allows to pass a custom ingester client factory
// used for testing purposes
func newIngesterQuerier(clientCfg client.Config, ring ring.ReadRing, extraQueryDelay time.Duration, clientFactory ring_client.PoolFactory, metricsNamespace string) (*IngesterQuerier, error) {
iq := IngesterQuerier{
ring: ring,
pool: clientpool.NewPool("ingester", clientCfg.PoolConfig, ring, clientFactory, util_log.Logger, metricsNamespace),
extraQueryDelay: extraQueryDelay,
}
err := services.StartAndAwaitRunning(context.Background(), iq.pool)
if err != nil {
return nil, errors.Wrap(err, "querier pool")
}
return &iq, nil
}
// forAllIngesters runs f, in parallel, for all ingesters
// TODO taken from Cortex, see if we can refactor out an usable interface.
func (q *IngesterQuerier) forAllIngesters(ctx context.Context, f func(context.Context, logproto.QuerierClient) (interface{}, error)) ([]responseFromIngesters, error) {
replicationSet, err := q.ring.GetReplicationSetForOperation(ring.Read)
if err != nil {
return nil, err
}
return q.forGivenIngesters(ctx, replicationSet, f)
}
// forGivenIngesters runs f, in parallel, for given ingesters
func (q *IngesterQuerier) forGivenIngesters(ctx context.Context, replicationSet ring.ReplicationSet, f func(context.Context, logproto.QuerierClient) (interface{}, error)) ([]responseFromIngesters, error) {
cfg := ring.DoUntilQuorumConfig{
// Nothing here
}
results, err := ring.DoUntilQuorum(ctx, replicationSet, cfg, func(ctx context.Context, ingester *ring.InstanceDesc) (responseFromIngesters, error) {
client, err := q.pool.GetClientFor(ingester.Addr)
if err != nil {
return responseFromIngesters{addr: ingester.Addr}, err
}
resp, err := f(ctx, client.(logproto.QuerierClient))
if err != nil {
return responseFromIngesters{addr: ingester.Addr}, err
}
return responseFromIngesters{ingester.Addr, resp}, nil
}, func(responseFromIngesters) {
// Nothing to do
})
if err != nil {
return nil, err
}
responses := make([]responseFromIngesters, 0, len(results))
responses = append(responses, results...)
return responses, err
}
func (q *IngesterQuerier) SelectLogs(ctx context.Context, params logql.SelectLogParams) ([]iter.EntryIterator, error) {
resps, err := q.forAllIngesters(ctx, func(_ context.Context, client logproto.QuerierClient) (interface{}, error) {
stats.FromContext(ctx).AddIngesterReached(1)
return client.Query(ctx, params.QueryRequest)
})
if err != nil {
return nil, err
}
iterators := make([]iter.EntryIterator, len(resps))
for i := range resps {
iterators[i] = iter.NewQueryClientIterator(resps[i].response.(logproto.Querier_QueryClient), params.Direction)
}
return iterators, nil
}
func (q *IngesterQuerier) SelectSample(ctx context.Context, params logql.SelectSampleParams) ([]iter.SampleIterator, error) {
resps, err := q.forAllIngesters(ctx, func(_ context.Context, client logproto.QuerierClient) (interface{}, error) {
stats.FromContext(ctx).AddIngesterReached(1)
return client.QuerySample(ctx, params.SampleQueryRequest)
})
if err != nil {
return nil, err
}
iterators := make([]iter.SampleIterator, len(resps))
for i := range resps {
iterators[i] = iter.NewSampleQueryClientIterator(resps[i].response.(logproto.Querier_QuerySampleClient))
}
return iterators, nil
}
func (q *IngesterQuerier) Label(ctx context.Context, req *logproto.LabelRequest) ([][]string, error) {
resps, err := q.forAllIngesters(ctx, func(ctx context.Context, client logproto.QuerierClient) (interface{}, error) {
return client.Label(ctx, req)
})
if err != nil {
return nil, err
}
results := make([][]string, 0, len(resps))
for _, resp := range resps {
results = append(results, resp.response.(*logproto.LabelResponse).Values)
}
return results, nil
}
func (q *IngesterQuerier) Tail(ctx context.Context, req *logproto.TailRequest) (map[string]logproto.Querier_TailClient, error) {
resps, err := q.forAllIngesters(ctx, func(_ context.Context, client logproto.QuerierClient) (interface{}, error) {
return client.Tail(ctx, req)
})
if err != nil {
return nil, err
}
tailClients := make(map[string]logproto.Querier_TailClient)
for i := range resps {
tailClients[resps[i].addr] = resps[i].response.(logproto.Querier_TailClient)
}
return tailClients, nil
}
func (q *IngesterQuerier) TailDisconnectedIngesters(ctx context.Context, req *logproto.TailRequest, connectedIngestersAddr []string) (map[string]logproto.Querier_TailClient, error) {
// Build a map to easily check if an ingester address is already connected
connected := make(map[string]bool)
for _, addr := range connectedIngestersAddr {
connected[addr] = true
}
// Get the current replication set from the ring
replicationSet, err := q.ring.GetReplicationSetForOperation(ring.Read)
if err != nil {
return nil, err
}
// Look for disconnected ingesters or new one we should (re)connect to
reconnectIngesters := []ring.InstanceDesc{}
for _, ingester := range replicationSet.Instances {
if _, ok := connected[ingester.Addr]; ok {
continue
}
// Skip ingesters which are leaving or joining the cluster
if ingester.State != ring.ACTIVE {
continue
}
reconnectIngesters = append(reconnectIngesters, ingester)
}
if len(reconnectIngesters) == 0 {
return nil, nil
}
// Instance a tail client for each ingester to re(connect)
reconnectClients, err := q.forGivenIngesters(ctx, ring.ReplicationSet{Instances: reconnectIngesters}, func(_ context.Context, client logproto.QuerierClient) (interface{}, error) {
return client.Tail(ctx, req)
})
if err != nil {
return nil, err
}
reconnectClientsMap := make(map[string]logproto.Querier_TailClient)
for _, client := range reconnectClients {
reconnectClientsMap[client.addr] = client.response.(logproto.Querier_TailClient)
}
return reconnectClientsMap, nil
}
func (q *IngesterQuerier) Series(ctx context.Context, req *logproto.SeriesRequest) ([][]logproto.SeriesIdentifier, error) {
resps, err := q.forAllIngesters(ctx, func(ctx context.Context, client logproto.QuerierClient) (interface{}, error) {
return client.Series(ctx, req)
})
if err != nil {
return nil, err
}
var acc [][]logproto.SeriesIdentifier
for _, resp := range resps {
acc = append(acc, resp.response.(*logproto.SeriesResponse).Series)
}
return acc, nil
}
func (q *IngesterQuerier) TailersCount(ctx context.Context) ([]uint32, error) {
replicationSet, err := q.ring.GetAllHealthy(ring.Read)
if err != nil {
return nil, err
}
// we want to check count of active tailers with only active ingesters
ingesters := make([]ring.InstanceDesc, 0, 1)
for i := range replicationSet.Instances {
if replicationSet.Instances[i].State == ring.ACTIVE {
ingesters = append(ingesters, replicationSet.Instances[i])
}
}
if len(ingesters) == 0 {
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "no active ingester found")
}
responses, err := q.forGivenIngesters(ctx, replicationSet, func(ctx context.Context, querierClient logproto.QuerierClient) (interface{}, error) {
resp, err := querierClient.TailersCount(ctx, &logproto.TailersCountRequest{})
if err != nil {
return nil, err
}
return resp.Count, nil
})
// We are only checking active ingesters, and any error returned stops checking other ingesters
// so return that error here as well.
if err != nil {
return nil, err
}
counts := make([]uint32, len(responses))
for _, resp := range responses {
counts = append(counts, resp.response.(uint32))
}
return counts, nil
}
func (q *IngesterQuerier) GetChunkIDs(ctx context.Context, from, through model.Time, matchers ...*labels.Matcher) ([]string, error) {
resps, err := q.forAllIngesters(ctx, func(ctx context.Context, querierClient logproto.QuerierClient) (interface{}, error) {
return querierClient.GetChunkIDs(ctx, &logproto.GetChunkIDsRequest{
Matchers: convertMatchersToString(matchers),
Start: from.Time(),
End: through.Time(),
})
})
if err != nil {
return nil, err
}
var chunkIDs []string
for i := range resps {
chunkIDs = append(chunkIDs, resps[i].response.(*logproto.GetChunkIDsResponse).ChunkIDs...)
}
return chunkIDs, nil
}
func (q *IngesterQuerier) Stats(ctx context.Context, _ string, from, through model.Time, matchers ...*labels.Matcher) (*index_stats.Stats, error) {
resps, err := q.forAllIngesters(ctx, func(ctx context.Context, querierClient logproto.QuerierClient) (interface{}, error) {
return querierClient.GetStats(ctx, &logproto.IndexStatsRequest{
From: from,
Through: through,
Matchers: syntax.MatchersString(matchers),
})
})
if err != nil {
if isUnimplementedCallError(err) {
// Handle communication with older ingesters gracefully
return &index_stats.Stats{}, nil
}
return nil, err
}
casted := make([]*index_stats.Stats, 0, len(resps))
for _, resp := range resps {
casted = append(casted, resp.response.(*index_stats.Stats))
}
merged := index_stats.MergeStats(casted...)
return &merged, nil
}
func (q *IngesterQuerier) Volume(ctx context.Context, _ string, from, through model.Time, limit int32, targetLabels []string, aggregateBy string, matchers ...*labels.Matcher) (*logproto.VolumeResponse, error) {
matcherString := "{}"
if len(matchers) > 0 {
matcherString = syntax.MatchersString(matchers)
}
resps, err := q.forAllIngesters(ctx, func(ctx context.Context, querierClient logproto.QuerierClient) (interface{}, error) {
return querierClient.GetVolume(ctx, &logproto.VolumeRequest{
From: from,
Through: through,
Matchers: matcherString,
Limit: limit,
TargetLabels: targetLabels,
AggregateBy: aggregateBy,
})
})
if err != nil {
if isUnimplementedCallError(err) {
// Handle communication with older ingesters gracefully
return &logproto.VolumeResponse{}, nil
}
return nil, err
}
casted := make([]*logproto.VolumeResponse, 0, len(resps))
for _, resp := range resps {
casted = append(casted, resp.response.(*logproto.VolumeResponse))
}
merged := seriesvolume.Merge(casted, limit)
return merged, nil
}
func (q *IngesterQuerier) DetectedLabel(ctx context.Context, req *logproto.DetectedLabelsRequest) (*logproto.LabelToValuesResponse, error) {
ingesterResponses, err := q.forAllIngesters(ctx, func(ctx context.Context, client logproto.QuerierClient) (interface{}, error) {
return client.GetDetectedLabels(ctx, req)
})
if err != nil {
return nil, err
}
labelMap := make(map[string][]string)
for _, resp := range ingesterResponses {
thisIngester := resp.response.(*logproto.LabelToValuesResponse)
for label, thisIngesterValues := range thisIngester.Labels {
var combinedValues []string
allIngesterValues, isLabelPresent := labelMap[label]
if isLabelPresent {
combinedValues = append(allIngesterValues, thisIngesterValues.Values...)
} else {
combinedValues = thisIngesterValues.Values
}
labelMap[label] = combinedValues
}
}
// Dedupe all ingester values
mergedResult := make(map[string]*logproto.UniqueLabelValues)
for label, val := range labelMap {
slices.Sort(val)
uniqueValues := slices.Compact(val)
mergedResult[label] = &logproto.UniqueLabelValues{
Values: uniqueValues,
}
}
return &logproto.LabelToValuesResponse{Labels: mergedResult}, nil
}
func convertMatchersToString(matchers []*labels.Matcher) string {
out := strings.Builder{}
out.WriteRune('{')
for idx, m := range matchers {
if idx > 0 {
out.WriteRune(',')
}
out.WriteString(m.String())
}
out.WriteRune('}')
return out.String()
}
// isUnimplementedCallError tells if the GRPC error is a gRPC error with code Unimplemented.
func isUnimplementedCallError(err error) bool {
if err == nil {
return false
}
s, ok := status.FromError(err)
if !ok {
return false
}
return (s.Code() == codes.Unimplemented)
}