fix: add a retry middleware to all the stats handlers

pkg/querier/queryrange/queryrangebase/retry.go

@@ -2,6 +2,7 @@ package queryrangebase
 
 import (
 	"context"
+	"reflect"
 	"time"
 
 	"github.com/go-kit/log"
@@ -95,6 +96,7 @@ func (r retry) Do(ctx context.Context, req Request) (Response, error) {
 			level.Error(util_log.WithContext(ctx, r.log)).Log(
 				"msg", "error processing request",
 				"try", tries,
+				"type", logImplementingType(req),
 				"query", query,
 				"query_hash", util.HashedQuery(query),
 				"start", start.Format(time.RFC3339Nano),
@@ -113,3 +115,18 @@ func (r retry) Do(ctx context.Context, req Request) (Response, error) {
 	}
 	return nil, lastErr
 }
+
+func logImplementingType(i Request) string {
+	if i == nil {
+		return "nil"
+	}
+
+	t := reflect.TypeOf(i)
+
+	// Check if it's a pointer and get the underlying type if so
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+
+	return t.String()
+}

pkg/querier/queryrange/querysharding.go

@@ -42,6 +42,7 @@ func NewQueryShardMiddleware(
 	limits Limits,
 	maxShards int,
 	statsHandler queryrangebase.Handler,
+	retryNextHandler queryrangebase.Handler,
 	shardAggregation []string,
 ) queryrangebase.Middleware {
 	noshards := !hasShards(confs)
@@ -56,7 +57,7 @@ func NewQueryShardMiddleware(
 	}
 
 	mapperware := queryrangebase.MiddlewareFunc(func(next queryrangebase.Handler) queryrangebase.Handler {
-		return newASTMapperware(confs, engineOpts, next, statsHandler, logger, shardingMetrics, limits, maxShards, shardAggregation)
+		return newASTMapperware(confs, engineOpts, next, retryNextHandler, statsHandler, logger, shardingMetrics, limits, maxShards, shardAggregation)
 	})
 
 	return queryrangebase.MiddlewareFunc(func(next queryrangebase.Handler) queryrangebase.Handler {
@@ -76,6 +77,7 @@ func newASTMapperware(
 	confs ShardingConfigs,
 	engineOpts logql.EngineOpts,
 	next queryrangebase.Handler,
+	retryNextHandler queryrangebase.Handler,
 	statsHandler queryrangebase.Handler,
 	logger log.Logger,
 	metrics *logql.MapperMetrics,
@@ -88,6 +90,7 @@ func newASTMapperware(
 		logger:           log.With(logger, "middleware", "QueryShard.astMapperware"),
 		limits:           limits,
 		next:             next,
+		retryNextHandler: retryNextHandler,
 		statsHandler:     next,
 		ng:               logql.NewDownstreamEngine(engineOpts, DownstreamHandler{next: next, limits: limits}, limits, logger),
 		metrics:          metrics,
@@ -103,14 +106,15 @@ func newASTMapperware(
 }
 
 type astMapperware struct {
-	confs        ShardingConfigs
-	logger       log.Logger
-	limits       Limits
-	next         queryrangebase.Handler
-	statsHandler queryrangebase.Handler
-	ng           *logql.DownstreamEngine
-	metrics      *logql.MapperMetrics
-	maxShards    int
+	confs            ShardingConfigs
+	logger           log.Logger
+	limits           Limits
+	next             queryrangebase.Handler
+	retryNextHandler queryrangebase.Handler
+	statsHandler     queryrangebase.Handler
+	ng               *logql.DownstreamEngine
+	metrics          *logql.MapperMetrics
+	maxShards        int
 
 	// Feature flag for sharding range and vector aggregations such as
 	// quantile_ver_time with probabilistic data structures.
@@ -191,6 +195,7 @@ func (ast *astMapperware) Do(ctx context.Context, r queryrangebase.Request) (que
 		ast.maxShards,
 		r,
 		ast.statsHandler,
+		ast.retryNextHandler,
 		ast.next,
 		ast.limits,
 	)

pkg/querier/queryrange/roundtrip.go

@@ -285,6 +285,10 @@ func NewMiddleware(
 func NewDetectedLabelsTripperware(cfg Config, opts logql.EngineOpts, logger log.Logger, l Limits, schema config.SchemaConfig, metrics *Metrics, mw base.Middleware, namespace string, merger base.Merger, limits Limits, iqo util.IngesterQueryOptions) (base.Middleware, error) {
 	return base.MiddlewareFunc(func(next base.Handler) base.Handler {
 		statsHandler := mw.Wrap(next)
+		if cfg.MaxRetries > 0 {
+			rm := base.NewRetryMiddleware(logger, cfg.MaxRetries, metrics.RetryMiddlewareMetrics, namespace)
+			statsHandler = rm.Wrap(statsHandler)
+		}
 		splitter := newDefaultSplitter(limits, iqo)
 
 		queryRangeMiddleware := []base.Middleware{
@@ -553,6 +557,12 @@ func getOperation(path string) string {
 func NewLogFilterTripperware(cfg Config, engineOpts logql.EngineOpts, log log.Logger, limits Limits, schema config.SchemaConfig, merger base.Merger, iqo util.IngesterQueryOptions, c cache.Cache, metrics *Metrics, indexStatsTripperware base.Middleware, metricsNamespace string) (base.Middleware, error) {
 	return base.MiddlewareFunc(func(next base.Handler) base.Handler {
 		statsHandler := indexStatsTripperware.Wrap(next)
+		retryNextHandler := next
+		if cfg.MaxRetries > 0 {
+			rm := base.NewRetryMiddleware(log, cfg.MaxRetries, metrics.RetryMiddlewareMetrics, metricsNamespace)
+			statsHandler = rm.Wrap(statsHandler)
+			retryNextHandler = rm.Wrap(next)
+		}
 
 		queryRangeMiddleware := []base.Middleware{
 			QueryMetricsMiddleware(metrics.QueryMetrics),
@@ -592,6 +602,7 @@ func NewLogFilterTripperware(cfg Config, engineOpts logql.EngineOpts, log log.Lo
 					limits,
 					0, // 0 is unlimited shards
 					statsHandler,
+					retryNextHandler,
 					cfg.ShardAggregations,
 				),
 			)
@@ -618,6 +629,12 @@ func NewLogFilterTripperware(cfg Config, engineOpts logql.EngineOpts, log log.Lo
 func NewLimitedTripperware(cfg Config, engineOpts logql.EngineOpts, log log.Logger, limits Limits, schema config.SchemaConfig, metrics *Metrics, merger base.Merger, iqo util.IngesterQueryOptions, indexStatsTripperware base.Middleware, metricsNamespace string) (base.Middleware, error) {
 	return base.MiddlewareFunc(func(next base.Handler) base.Handler {
 		statsHandler := indexStatsTripperware.Wrap(next)
+		retryNextHandler := next
+		if cfg.MaxRetries > 0 {
+			rm := base.NewRetryMiddleware(log, cfg.MaxRetries, metrics.RetryMiddlewareMetrics, metricsNamespace)
+			statsHandler = rm.Wrap(statsHandler)
+			retryNextHandler = rm.Wrap(next)
+		}
 
 		queryRangeMiddleware := []base.Middleware{
 			StatsCollectorMiddleware(),
@@ -639,6 +656,7 @@ func NewLimitedTripperware(cfg Config, engineOpts logql.EngineOpts, log log.Logg
 					// and overwhelming the frontend, therefore we fix the number of shards to prevent this.
 					32, // 0 is unlimited shards
 					statsHandler,
+					retryNextHandler,
 					cfg.ShardAggregations,
 				),
 			)
@@ -854,6 +872,12 @@ func NewMetricTripperware(cfg Config, engineOpts logql.EngineOpts, log log.Logge
 
 	return base.MiddlewareFunc(func(next base.Handler) base.Handler {
 		statsHandler := indexStatsTripperware.Wrap(next)
+		retryNextHandler := next
+		if cfg.MaxRetries > 0 {
+			rm := base.NewRetryMiddleware(log, cfg.MaxRetries, metrics.RetryMiddlewareMetrics, metricsNamespace)
+			statsHandler = rm.Wrap(statsHandler)
+			retryNextHandler = rm.Wrap(next)
+		}
 
 		queryRangeMiddleware := []base.Middleware{
 			QueryMetricsMiddleware(metrics.QueryMetrics),
@@ -895,6 +919,7 @@ func NewMetricTripperware(cfg Config, engineOpts logql.EngineOpts, log log.Logge
 					limits,
 					0, // 0 is unlimited shards
 					statsHandler,
+					retryNextHandler,
 					cfg.ShardAggregations,
 				),
 			)
@@ -976,6 +1001,12 @@ func NewInstantMetricTripperware(
 
 	return base.MiddlewareFunc(func(next base.Handler) base.Handler {
 		statsHandler := indexStatsTripperware.Wrap(next)
+		retryNextHandler := next
+		if cfg.MaxRetries > 0 {
+			rm := base.NewRetryMiddleware(log, cfg.MaxRetries, metrics.RetryMiddlewareMetrics, metricsNamespace)
+			statsHandler = rm.Wrap(statsHandler)
+			retryNextHandler = rm.Wrap(next)
+		}
 
 		queryRangeMiddleware := []base.Middleware{
 			StatsCollectorMiddleware(),
@@ -1003,6 +1034,7 @@ func NewInstantMetricTripperware(
 					limits,
 					0, // 0 is unlimited shards
 					statsHandler,
+					retryNextHandler,
 					cfg.ShardAggregations,
 				),
 			)

pkg/querier/queryrange/shard_resolver.go

@@ -37,21 +37,22 @@ func shardResolverForConf(
 	maxParallelism int,
 	maxShards int,
 	r queryrangebase.Request,
-	statsHandler, next queryrangebase.Handler,
+	statsHandler, next, retryNext queryrangebase.Handler,
 	limits Limits,
 ) (logql.ShardResolver, bool) {
 	if conf.IndexType == types.TSDBType {
 		return &dynamicShardResolver{
-			ctx:             ctx,
-			logger:          logger,
-			statsHandler:    statsHandler,
-			next:            next,
-			limits:          limits,
-			from:            model.Time(r.GetStart().UnixMilli()),
-			through:         model.Time(r.GetEnd().UnixMilli()),
-			maxParallelism:  maxParallelism,
-			maxShards:       maxShards,
-			defaultLookback: defaultLookback,
+			ctx:              ctx,
+			logger:           logger,
+			statsHandler:     statsHandler,
+			retryNextHandler: retryNext,
+			next:             next,
+			limits:           limits,
+			from:             model.Time(r.GetStart().UnixMilli()),
+			through:          model.Time(r.GetEnd().UnixMilli()),
+			maxParallelism:   maxParallelism,
+			maxShards:        maxShards,
+			defaultLookback:  defaultLookback,
 		}, true
 	}
 	if conf.RowShards < 2 {
@@ -64,10 +65,11 @@ type dynamicShardResolver struct {
 	ctx context.Context
 	// TODO(owen-d): shouldn't have to fork handlers here -- one should just transparently handle the right logic
 	// depending on the underlying type?
-	statsHandler queryrangebase.Handler // index stats handler (hooked up to results cache, etc)
-	next         queryrangebase.Handler // next handler in the chain (used for non-stats reqs)
-	logger       log.Logger
-	limits       Limits
+	statsHandler     queryrangebase.Handler // index stats handler (hooked up to results cache, etc)
+	retryNextHandler queryrangebase.Handler // next handler wrapped with retries
+	next             queryrangebase.Handler // next handler in the chain (used for non-stats reqs)
+	logger           log.Logger
+	limits           Limits
 
 	from, through   model.Time
 	maxParallelism  int
@@ -251,7 +253,8 @@ func (r *dynamicShardResolver) ShardingRanges(expr syntax.Expr, targetBytesPerSh
 	exprStr := expr.String()
 	// try to get shards for the given expression
 	// if it fails, fallback to linearshards based on stats
-	resp, err := r.next.Do(r.ctx, &logproto.ShardsRequest{
+	// use the retry handler here to retry transient errors
+	resp, err := r.retryNextHandler.Do(r.ctx, &logproto.ShardsRequest{
 		From:                adjustedFrom,
 		Through:             r.through,
 		Query:               expr.String(),