perf: exception page optimization (#1287)

* feat: update ListErrors API

* feat: update error detail APIs and add a new API for fetching next prev error IDs

* feat: update GetNextPrevErrorIDs API to handle an edge case

* perf: use timestamp for fetching individual column

* feat: add countErrors API

pkg/query-service/app/clickhouseReader/options.go

@@ -22,7 +22,7 @@ const (
 	defaultTraceDB         string        = "signoz_traces"
 	defaultOperationsTable string        = "signoz_operations"
 	defaultIndexTable      string        = "signoz_index_v2"
-	defaultErrorTable      string        = "signoz_error_index"
+	defaultErrorTable      string        = "signoz_error_index_v2"
 	defaulDurationTable    string        = "durationSortMV"
 	defaultSpansTable      string        = "signoz_spans"
 	defaultWriteBatchDelay time.Duration = 5 * time.Second

pkg/query-service/app/clickhouseReader/reader.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"crypto/md5"
-	"database/sql"
 	"encoding/json"
 	"flag"
 	"fmt"
@@ -60,7 +59,7 @@ const (
 	signozTraceDBName     = "signoz_traces"
 	signozDurationMVTable = "durationSort"
 	signozSpansTable      = "signoz_spans"
-	signozErrorIndexTable = "signoz_error_index"
+	signozErrorIndexTable = "signoz_error_index_v2"
 	signozTraceTableName  = "signoz_index_v2"
 	signozMetricDBName    = "signoz_metrics"
 	signozSampleTableName = "samples_v2"
@@ -2634,15 +2633,30 @@ func (r *ClickHouseReader) GetTTL(ctx context.Context, ttlParams *model.GetTTLPa
 
 }
 
-func (r *ClickHouseReader) GetErrors(ctx context.Context, queryParams *model.GetErrorsParams) (*[]model.Error, *model.ApiError) {
+func (r *ClickHouseReader) ListErrors(ctx context.Context, queryParams *model.ListErrorsParams) (*[]model.Error, *model.ApiError) {
 
-	var getErrorReponses []model.Error
+	var getErrorResponses []model.Error
 
-	query := fmt.Sprintf("SELECT exceptionType, exceptionMessage, count() AS exceptionCount, min(timestamp) as firstSeen, max(timestamp) as lastSeen, serviceName FROM %s.%s WHERE timestamp >= @timestampL AND timestamp <= @timestampU GROUP BY serviceName, exceptionType, exceptionMessage", r.traceDB, r.errorTable)
+	query := fmt.Sprintf("SELECT any(exceptionType) as exceptionType, any(exceptionMessage) as exceptionMessage, count() AS exceptionCount, min(timestamp) as firstSeen, max(timestamp) as lastSeen, any(serviceName) as serviceName, groupID FROM %s.%s WHERE timestamp >= @timestampL AND timestamp <= @timestampU GROUP BY groupID", r.traceDB, r.errorTable)
 	args := []interface{}{clickhouse.Named("timestampL", strconv.FormatInt(queryParams.Start.UnixNano(), 10)), clickhouse.Named("timestampU", strconv.FormatInt(queryParams.End.UnixNano(), 10))}
+	if len(queryParams.OrderParam) != 0 {
+		if queryParams.Order == constants.Descending {
+			query = query + " ORDER BY " + queryParams.OrderParam + " DESC"
+		} else if queryParams.Order == constants.Ascending {
+			query = query + " ORDER BY " + queryParams.OrderParam + " ASC"
+		}
+	}
+	if queryParams.Limit > 0 {
+		query = query + " LIMIT @limit"
+		args = append(args, clickhouse.Named("limit", queryParams.Limit))
+	}
 
-	err := r.db.Select(ctx, &getErrorReponses, query, args...)
+	if queryParams.Offset > 0 {
+		query = query + " OFFSET @offset"
+		args = append(args, clickhouse.Named("offset", queryParams.Offset))
+	}
 
+	err := r.db.Select(ctx, &getErrorResponses, query, args...)
 	zap.S().Info(query)
 
 	if err != nil {
@@ -2650,30 +2664,41 @@ func (r *ClickHouseReader) GetErrors(ctx context.Context, queryParams *model.Get
 		return nil, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
 	}
 
-	return &getErrorReponses, nil
+	return &getErrorResponses, nil
-
 }
 
-func (r *ClickHouseReader) GetErrorForId(ctx context.Context, queryParams *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError) {
+func (r *ClickHouseReader) CountErrors(ctx context.Context, queryParams *model.CountErrorsParams) (uint64, *model.ApiError) {
+
+	var errorCount uint64
+
+	query := fmt.Sprintf("SELECT count(distinct(groupID)) FROM %s.%s WHERE timestamp >= @timestampL AND timestamp <= @timestampU", r.traceDB, r.errorTable)
+	args := []interface{}{clickhouse.Named("timestampL", strconv.FormatInt(queryParams.Start.UnixNano(), 10)), clickhouse.Named("timestampU", strconv.FormatInt(queryParams.End.UnixNano(), 10))}
+
+	err := r.db.QueryRow(ctx, query, args...).Scan(&errorCount)
+	zap.S().Info(query)
+
+	if err != nil {
+		zap.S().Debug("Error in processing sql query: ", err)
+		return 0, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
+	}
+
+	return errorCount, nil
+}
+
+func (r *ClickHouseReader) GetErrorFromErrorID(ctx context.Context, queryParams *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError) {
 
 	if queryParams.ErrorID == "" {
 		zap.S().Debug("errorId missing from params")
-		return nil, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("ErrorID missing from params")}
+		return nil, &model.ApiError{Typ: model.ErrorBadData, Err: fmt.Errorf("ErrorID missing from params")}
 	}
 	var getErrorWithSpanReponse []model.ErrorWithSpan
 
-	// TODO: Optimize this query further
+	query := fmt.Sprintf("SELECT * FROM %s.%s WHERE timestamp = @timestamp AND groupID = @groupID AND errorID = @errorID LIMIT 1", r.traceDB, r.errorTable)
-	query := fmt.Sprintf("SELECT spanID, traceID, errorID, timestamp, serviceName, exceptionType, exceptionMessage, exceptionStacktrace, exceptionEscaped, olderErrorId, newerErrorId FROM (SELECT *, lagInFrame(toNullable(errorID)) over w as olderErrorId, leadInFrame(toNullable(errorID)) over w as newerErrorId FROM %s.%s window w as (ORDER BY exceptionType, serviceName, timestamp rows between unbounded preceding and unbounded following)) WHERE errorID = @errorID", r.traceDB, r.errorTable)
+	args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID), clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
-	args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID)}
 
 	err := r.db.Select(ctx, &getErrorWithSpanReponse, query, args...)
-
 	zap.S().Info(query)
 
-	if err == sql.ErrNoRows {
-		return nil, nil
-	}
-
 	if err != nil {
 		zap.S().Debug("Error in processing sql query: ", err)
 		return nil, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
@@ -2682,22 +2707,17 @@ func (r *ClickHouseReader) GetErrorForId(ctx context.Context, queryParams *model
 	if len(getErrorWithSpanReponse) > 0 {
 		return &getErrorWithSpanReponse[0], nil
 	} else {
-		return &model.ErrorWithSpan{}, &model.ApiError{Typ: model.ErrorNotFound, Err: fmt.Errorf("Error ID not found")}
+		return nil, &model.ApiError{Typ: model.ErrorNotFound, Err: fmt.Errorf("Error/Exception not found")}
 	}
 
 }
 
-func (r *ClickHouseReader) GetErrorForType(ctx context.Context, queryParams *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError) {
+func (r *ClickHouseReader) GetErrorFromGroupID(ctx context.Context, queryParams *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError) {
 
-	if queryParams.ErrorType == "" || queryParams.ServiceName == "" {
-		zap.S().Debug("errorType/serviceName missing from params")
-		return nil, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("ErrorType/serviceName missing from params")}
-	}
 	var getErrorWithSpanReponse []model.ErrorWithSpan
 
-	// TODO: Optimize this query further
+	query := fmt.Sprintf("SELECT * FROM %s.%s WHERE timestamp = @timestamp AND groupID = @groupID LIMIT 1", r.traceDB, r.errorTable)
-	query := fmt.Sprintf("SELECT spanID, traceID, errorID, timestamp , serviceName, exceptionType, exceptionMessage, exceptionStacktrace, exceptionEscaped, newerErrorId, olderErrorId FROM (SELECT *, lagInFrame(errorID) over w as olderErrorId, leadInFrame(errorID) over w as newerErrorId FROM %s.%s WHERE serviceName = @serviceName AND exceptionType = @errorType window w as (ORDER BY timestamp DESC rows between unbounded preceding and unbounded following))", r.traceDB, r.errorTable)
+	args := []interface{}{clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
-	args := []interface{}{clickhouse.Named("serviceName", queryParams.ServiceName), clickhouse.Named("errorType", queryParams.ErrorType)}
 
 	err := r.db.Select(ctx, &getErrorWithSpanReponse, query, args...)
 
@@ -2711,11 +2731,173 @@ func (r *ClickHouseReader) GetErrorForType(ctx context.Context, queryParams *mod
 	if len(getErrorWithSpanReponse) > 0 {
 		return &getErrorWithSpanReponse[0], nil
 	} else {
-		return nil, &model.ApiError{Typ: model.ErrorUnavailable, Err: fmt.Errorf("Error/Exception not found")}
+		return nil, &model.ApiError{Typ: model.ErrorNotFound, Err: fmt.Errorf("Error/Exception not found")}
 	}
 
 }
 
+func (r *ClickHouseReader) GetNextPrevErrorIDs(ctx context.Context, queryParams *model.GetErrorParams) (*model.NextPrevErrorIDs, *model.ApiError) {
+
+	if queryParams.ErrorID == "" {
+		zap.S().Debug("errorId missing from params")
+		return nil, &model.ApiError{Typ: model.ErrorBadData, Err: fmt.Errorf("ErrorID missing from params")}
+	}
+	var err *model.ApiError
+	getNextPrevErrorIDsResponse := model.NextPrevErrorIDs{
+		GroupID: queryParams.GroupID,
+	}
+	getNextPrevErrorIDsResponse.NextErrorID, getNextPrevErrorIDsResponse.NextTimestamp, err = r.getNextErrorID(ctx, queryParams)
+	if err != nil {
+		zap.S().Debug("Unable to get next error ID due to err: ", err)
+		return nil, err
+	}
+	getNextPrevErrorIDsResponse.PrevErrorID, getNextPrevErrorIDsResponse.PrevTimestamp, err = r.getPrevErrorID(ctx, queryParams)
+	if err != nil {
+		zap.S().Debug("Unable to get prev error ID due to err: ", err)
+		return nil, err
+	}
+	return &getNextPrevErrorIDsResponse, nil
+
+}
+
+func (r *ClickHouseReader) getNextErrorID(ctx context.Context, queryParams *model.GetErrorParams) (string, time.Time, *model.ApiError) {
+
+	var getNextErrorIDReponse []model.NextPrevErrorIDsDBResponse
+
+	query := fmt.Sprintf("SELECT errorID as nextErrorID, timestamp as nextTimestamp FROM %s.%s WHERE groupID = @groupID AND timestamp >= @timestamp AND errorID != @errorID ORDER BY timestamp ASC LIMIT 2", r.traceDB, r.errorTable)
+	args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID), clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
+
+	err := r.db.Select(ctx, &getNextErrorIDReponse, query, args...)
+
+	zap.S().Info(query)
+
+	if err != nil {
+		zap.S().Debug("Error in processing sql query: ", err)
+		return "", time.Time{}, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
+	}
+	if len(getNextErrorIDReponse) == 0 {
+		zap.S().Info("NextErrorID not found")
+		return "", time.Time{}, nil
+	} else if len(getNextErrorIDReponse) == 1 {
+		zap.S().Info("NextErrorID found")
+		return getNextErrorIDReponse[0].NextErrorID, getNextErrorIDReponse[0].NextTimestamp, nil
+	} else {
+		if getNextErrorIDReponse[0].Timestamp.UnixNano() == getNextErrorIDReponse[1].Timestamp.UnixNano() {
+			var getNextErrorIDReponse []model.NextPrevErrorIDsDBResponse
+
+			query := fmt.Sprintf("SELECT errorID as nextErrorID, timestamp as nextTimestamp FROM %s.%s WHERE groupID = @groupID AND timestamp = @timestamp AND errorID > @errorID ORDER BY errorID ASC LIMIT 1", r.traceDB, r.errorTable)
+			args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID), clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
+
+			err := r.db.Select(ctx, &getNextErrorIDReponse, query, args...)
+
+			zap.S().Info(query)
+
+			if err != nil {
+				zap.S().Debug("Error in processing sql query: ", err)
+				return "", time.Time{}, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
+			}
+			if len(getNextErrorIDReponse) == 0 {
+				var getNextErrorIDReponse []model.NextPrevErrorIDsDBResponse
+
+				query := fmt.Sprintf("SELECT errorID as nextErrorID, timestamp as nextTimestamp FROM %s.%s WHERE groupID = @groupID AND timestamp > @timestamp ORDER BY timestamp ASC LIMIT 1", r.traceDB, r.errorTable)
+				args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID), clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
+
+				err := r.db.Select(ctx, &getNextErrorIDReponse, query, args...)
+
+				zap.S().Info(query)
+
+				if err != nil {
+					zap.S().Debug("Error in processing sql query: ", err)
+					return "", time.Time{}, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
+				}
+
+				if len(getNextErrorIDReponse) == 0 {
+					zap.S().Info("NextErrorID not found")
+					return "", time.Time{}, nil
+				} else {
+					zap.S().Info("NextErrorID found")
+					return getNextErrorIDReponse[0].NextErrorID, getNextErrorIDReponse[0].NextTimestamp, nil
+				}
+			} else {
+				zap.S().Info("NextErrorID found")
+				return getNextErrorIDReponse[0].NextErrorID, getNextErrorIDReponse[0].NextTimestamp, nil
+			}
+		} else {
+			zap.S().Info("NextErrorID found")
+			return getNextErrorIDReponse[0].NextErrorID, getNextErrorIDReponse[0].NextTimestamp, nil
+		}
+	}
+}
+
+func (r *ClickHouseReader) getPrevErrorID(ctx context.Context, queryParams *model.GetErrorParams) (string, time.Time, *model.ApiError) {
+
+	var getPrevErrorIDReponse []model.NextPrevErrorIDsDBResponse
+
+	query := fmt.Sprintf("SELECT errorID as prevErrorID, timestamp as prevTimestamp FROM %s.%s WHERE groupID = @groupID AND timestamp <= @timestamp AND errorID != @errorID ORDER BY timestamp DESC LIMIT 2", r.traceDB, r.errorTable)
+	args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID), clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
+
+	err := r.db.Select(ctx, &getPrevErrorIDReponse, query, args...)
+
+	zap.S().Info(query)
+
+	if err != nil {
+		zap.S().Debug("Error in processing sql query: ", err)
+		return "", time.Time{}, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
+	}
+	if len(getPrevErrorIDReponse) == 0 {
+		zap.S().Info("PrevErrorID not found")
+		return "", time.Time{}, nil
+	} else if len(getPrevErrorIDReponse) == 1 {
+		zap.S().Info("PrevErrorID found")
+		return getPrevErrorIDReponse[0].PrevErrorID, getPrevErrorIDReponse[0].PrevTimestamp, nil
+	} else {
+		if getPrevErrorIDReponse[0].Timestamp.UnixNano() == getPrevErrorIDReponse[1].Timestamp.UnixNano() {
+			var getPrevErrorIDReponse []model.NextPrevErrorIDsDBResponse
+
+			query := fmt.Sprintf("SELECT errorID as prevErrorID, timestamp as prevTimestamp FROM %s.%s WHERE groupID = @groupID AND timestamp = @timestamp AND errorID < @errorID ORDER BY errorID DESC LIMIT 1", r.traceDB, r.errorTable)
+			args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID), clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
+
+			err := r.db.Select(ctx, &getPrevErrorIDReponse, query, args...)
+
+			zap.S().Info(query)
+
+			if err != nil {
+				zap.S().Debug("Error in processing sql query: ", err)
+				return "", time.Time{}, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
+			}
+			if len(getPrevErrorIDReponse) == 0 {
+				var getPrevErrorIDReponse []model.NextPrevErrorIDsDBResponse
+
+				query := fmt.Sprintf("SELECT errorID as prevErrorID, timestamp as prevTimestamp FROM %s.%s WHERE groupID = @groupID AND timestamp < @timestamp ORDER BY timestamp DESC LIMIT 1", r.traceDB, r.errorTable)
+				args := []interface{}{clickhouse.Named("errorID", queryParams.ErrorID), clickhouse.Named("groupID", queryParams.GroupID), clickhouse.Named("timestamp", strconv.FormatInt(queryParams.Timestamp.UnixNano(), 10))}
+
+				err := r.db.Select(ctx, &getPrevErrorIDReponse, query, args...)
+
+				zap.S().Info(query)
+
+				if err != nil {
+					zap.S().Debug("Error in processing sql query: ", err)
+					return "", time.Time{}, &model.ApiError{Typ: model.ErrorExec, Err: fmt.Errorf("Error in processing sql query")}
+				}
+
+				if len(getPrevErrorIDReponse) == 0 {
+					zap.S().Info("PrevErrorID not found")
+					return "", time.Time{}, nil
+				} else {
+					zap.S().Info("PrevErrorID found")
+					return getPrevErrorIDReponse[0].PrevErrorID, getPrevErrorIDReponse[0].PrevTimestamp, nil
+				}
+			} else {
+				zap.S().Info("PrevErrorID found")
+				return getPrevErrorIDReponse[0].PrevErrorID, getPrevErrorIDReponse[0].PrevTimestamp, nil
+			}
+		} else {
+			zap.S().Info("PrevErrorID found")
+			return getPrevErrorIDReponse[0].PrevErrorID, getPrevErrorIDReponse[0].PrevTimestamp, nil
+		}
+	}
+}
+
 func (r *ClickHouseReader) GetMetricAutocompleteTagKey(ctx context.Context, params *model.MetricAutocompleteTagParams) (*[]string, *model.ApiError) {
 
 	var query string

pkg/query-service/app/http_handler.go

@@ -327,11 +327,13 @@ func (aH *APIHandler) RegisterRoutes(router *mux.Router) {
 	router.HandleFunc("/api/v1/getTagFilters", ViewAccess(aH.getTagFilters)).Methods(http.MethodPost)
 	router.HandleFunc("/api/v1/getFilteredSpans", ViewAccess(aH.getFilteredSpans)).Methods(http.MethodPost)
 	router.HandleFunc("/api/v1/getFilteredSpans/aggregates", ViewAccess(aH.getFilteredSpanAggregates)).Methods(http.MethodPost)
-
 	router.HandleFunc("/api/v1/getTagValues", ViewAccess(aH.getTagValues)).Methods(http.MethodPost)
-	router.HandleFunc("/api/v1/errors", ViewAccess(aH.getErrors)).Methods(http.MethodGet)
+
-	router.HandleFunc("/api/v1/errorWithId", ViewAccess(aH.getErrorForId)).Methods(http.MethodGet)
+	router.HandleFunc("/api/v1/listErrors", ViewAccess(aH.listErrors)).Methods(http.MethodGet)
-	router.HandleFunc("/api/v1/errorWithType", ViewAccess(aH.getErrorForType)).Methods(http.MethodGet)
+	router.HandleFunc("/api/v1/countErrors", ViewAccess(aH.countErrors)).Methods(http.MethodGet)
+	router.HandleFunc("/api/v1/errorFromErrorID", ViewAccess(aH.getErrorFromErrorID)).Methods(http.MethodGet)
+	router.HandleFunc("/api/v1/errorFromGroupID", ViewAccess(aH.getErrorFromGroupID)).Methods(http.MethodGet)
+	router.HandleFunc("/api/v1/nextPrevErrorIDs", ViewAccess(aH.getNextPrevErrorIDs)).Methods(http.MethodGet)
 
 	router.HandleFunc("/api/v1/disks", ViewAccess(aH.getDisks)).Methods(http.MethodGet)
 
@@ -1177,49 +1179,78 @@ func (aH *APIHandler) searchTraces(w http.ResponseWriter, r *http.Request) {
 
 }
 
-func (aH *APIHandler) getErrors(w http.ResponseWriter, r *http.Request) {
+func (aH *APIHandler) listErrors(w http.ResponseWriter, r *http.Request) {
 
-	query, err := parseErrorsRequest(r)
+	query, err := parseListErrorsRequest(r)
 	if aH.handleError(w, err, http.StatusBadRequest) {
 		return
 	}
-	result, apiErr := (*aH.reader).GetErrors(r.Context(), query)
+	result, apiErr := (*aH.reader).ListErrors(r.Context(), query)
 	if apiErr != nil && aH.handleError(w, apiErr.Err, http.StatusInternalServerError) {
 		return
 	}
 
 	aH.writeJSON(w, r, result)
-
 }
 
-func (aH *APIHandler) getErrorForId(w http.ResponseWriter, r *http.Request) {
+func (aH *APIHandler) countErrors(w http.ResponseWriter, r *http.Request) {
 
-	query, err := parseErrorRequest(r)
+	query, err := parseCountErrorsRequest(r)
 	if aH.handleError(w, err, http.StatusBadRequest) {
 		return
 	}
-	result, apiErr := (*aH.reader).GetErrorForId(r.Context(), query)
+	result, apiErr := (*aH.reader).CountErrors(r.Context(), query)
-	if apiErr != nil && aH.handleError(w, apiErr.Err, http.StatusInternalServerError) {
+	if apiErr != nil {
+		respondError(w, apiErr, nil)
 		return
 	}
 
 	aH.writeJSON(w, r, result)
-
 }
 
-func (aH *APIHandler) getErrorForType(w http.ResponseWriter, r *http.Request) {
+func (aH *APIHandler) getErrorFromErrorID(w http.ResponseWriter, r *http.Request) {
 
-	query, err := parseErrorRequest(r)
+	query, err := parseGetErrorRequest(r)
 	if aH.handleError(w, err, http.StatusBadRequest) {
 		return
 	}
-	result, apiErr := (*aH.reader).GetErrorForType(r.Context(), query)
+	result, apiErr := (*aH.reader).GetErrorFromErrorID(r.Context(), query)
-	if apiErr != nil && aH.handleError(w, apiErr.Err, http.StatusInternalServerError) {
+	if apiErr != nil {
+		respondError(w, apiErr, nil)
 		return
 	}
 
 	aH.writeJSON(w, r, result)
+}
 
+func (aH *APIHandler) getNextPrevErrorIDs(w http.ResponseWriter, r *http.Request) {
+
+	query, err := parseGetErrorRequest(r)
+	if aH.handleError(w, err, http.StatusBadRequest) {
+		return
+	}
+	result, apiErr := (*aH.reader).GetNextPrevErrorIDs(r.Context(), query)
+	if apiErr != nil {
+		respondError(w, apiErr, nil)
+		return
+	}
+
+	aH.writeJSON(w, r, result)
+}
+
+func (aH *APIHandler) getErrorFromGroupID(w http.ResponseWriter, r *http.Request) {
+
+	query, err := parseGetErrorRequest(r)
+	if aH.handleError(w, err, http.StatusBadRequest) {
+		return
+	}
+	result, apiErr := (*aH.reader).GetErrorFromGroupID(r.Context(), query)
+	if apiErr != nil {
+		respondError(w, apiErr, nil)
+		return
+	}
+
+	aH.writeJSON(w, r, result)
 }
 
 func (aH *APIHandler) getSpanFilters(w http.ResponseWriter, r *http.Request) {

pkg/query-service/app/parser.go

@@ -360,28 +360,6 @@ func parseFilteredSpanAggregatesRequest(r *http.Request) (*model.GetFilteredSpan
 	return postData, nil
 }
 
-func parseErrorRequest(r *http.Request) (*model.GetErrorParams, error) {
-
-	params := &model.GetErrorParams{}
-
-	serviceName := r.URL.Query().Get("serviceName")
-	if len(serviceName) != 0 {
-		params.ServiceName = serviceName
-	}
-
-	errorType := r.URL.Query().Get("errorType")
-	if len(errorType) != 0 {
-		params.ErrorType = errorType
-	}
-
-	errorId := r.URL.Query().Get("errorId")
-	if len(errorId) != 0 {
-		params.ErrorID = errorId
-	}
-
-	return params, nil
-}
-
 func parseTagFilterRequest(r *http.Request) (*model.TagFilterParams, error) {
 	var postData *model.TagFilterParams
 	err := json.NewDecoder(r.Body).Decode(&postData)
@@ -427,7 +405,10 @@ func parseTagValueRequest(r *http.Request) (*model.TagFilterParams, error) {
 
 }
 
-func parseErrorsRequest(r *http.Request) (*model.GetErrorsParams, error) {
+func parseListErrorsRequest(r *http.Request) (*model.ListErrorsParams, error) {
+
+	var allowedOrderParams = []string{"exceptionType", "exceptionCount", "firstSeen", "lastSeen", "serviceName"}
+	var allowedOrderDirections = []string{"ascending", "descending"}
 
 	startTime, err := parseTime("start", r)
 	if err != nil {
@@ -438,9 +419,79 @@ func parseErrorsRequest(r *http.Request) (*model.GetErrorsParams, error) {
 		return nil, err
 	}
 
-	params := &model.GetErrorsParams{
+	order := r.URL.Query().Get("order")
+	if len(order) > 0 && !DoesExistInSlice(order, allowedOrderDirections) {
+		return nil, errors.New(fmt.Sprintf("given order: %s is not allowed in query", order))
+	}
+	orderParam := r.URL.Query().Get("orderParam")
+	if len(order) > 0 && !DoesExistInSlice(orderParam, allowedOrderParams) {
+		return nil, errors.New(fmt.Sprintf("given orderParam: %s is not allowed in query", orderParam))
+	}
+	limit := r.URL.Query().Get("limit")
+	offset := r.URL.Query().Get("offset")
+
+	if len(offset) == 0 || len(limit) == 0 {
+		return nil, fmt.Errorf("offset or limit param cannot be empty from the query")
+	}
+
+	limitInt, err := strconv.Atoi(limit)
+	if err != nil {
+		return nil, errors.New("limit param is not in correct format")
+	}
+	offsetInt, err := strconv.Atoi(offset)
+	if err != nil {
+		return nil, errors.New("offset param is not in correct format")
+	}
+
+	params := &model.ListErrorsParams{
 		Start:      startTime,
 		End:        endTime,
+		OrderParam: orderParam,
+		Order:      order,
+		Limit:      int64(limitInt),
+		Offset:     int64(offsetInt),
+	}
+
+	return params, nil
+}
+
+func parseCountErrorsRequest(r *http.Request) (*model.CountErrorsParams, error) {
+
+	startTime, err := parseTime("start", r)
+	if err != nil {
+		return nil, err
+	}
+	endTime, err := parseTimeMinusBuffer("end", r)
+	if err != nil {
+		return nil, err
+	}
+
+	params := &model.CountErrorsParams{
+		Start:      startTime,
+		End:        endTime,
+	}
+
+	return params, nil
+}
+
+func parseGetErrorRequest(r *http.Request) (*model.GetErrorParams, error) {
+
+	timestamp, err := parseTime("timestamp", r)
+	if err != nil {
+		return nil, err
+	}
+
+	groupID := r.URL.Query().Get("groupID")
+
+	if len(groupID) == 0 {
+		return nil, fmt.Errorf("groupID param cannot be empty from the query")
+	}
+	errorID := r.URL.Query().Get("errorID")
+
+	params := &model.GetErrorParams{
+		Timestamp: timestamp,
+		GroupID:   groupID,
+		ErrorID:   errorID,
 	}
 
 	return params, nil

pkg/query-service/constants/constants.go

@@ -61,6 +61,10 @@ const (
 	StatusPending    = "pending"
 	StatusFailed     = "failed"
 	StatusSuccess    = "success"
+	ExceptionType    = "exceptionType"
+	ExceptionCount   = "exceptionCount"
+	LastSeen         = "lastSeen"
+	FirstSeen        = "firstSeen"
 )
 const (
 	SIGNOZ_METRIC_DBNAME        = "signoz_metrics"

pkg/query-service/interfaces/interface.go

@@ -41,9 +41,12 @@ type Reader interface {
 	GetFilteredSpans(ctx context.Context, query *model.GetFilteredSpansParams) (*model.GetFilterSpansResponse, *model.ApiError)
 	GetFilteredSpansAggregates(ctx context.Context, query *model.GetFilteredSpanAggregatesParams) (*model.GetFilteredSpansAggregatesResponse, *model.ApiError)
 
-	GetErrors(ctx context.Context, params *model.GetErrorsParams) (*[]model.Error, *model.ApiError)
+	ListErrors(ctx context.Context, params *model.ListErrorsParams) (*[]model.Error, *model.ApiError)
-	GetErrorForId(ctx context.Context, params *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError)
+	CountErrors(ctx context.Context, params *model.CountErrorsParams) (uint64, *model.ApiError)
-	GetErrorForType(ctx context.Context, params *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError)
+	GetErrorFromErrorID(ctx context.Context, params *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError)
+	GetErrorFromGroupID(ctx context.Context, params *model.GetErrorParams) (*model.ErrorWithSpan, *model.ApiError)
+	GetNextPrevErrorIDs(ctx context.Context, params *model.GetErrorParams) (*model.NextPrevErrorIDs, *model.ApiError)
+
 	// Search Interfaces
 	SearchTraces(ctx context.Context, traceID string) (*[]model.SearchSpansResult, error)
 

pkg/query-service/model/queryParams.go

@@ -282,15 +282,24 @@ type GetTTLParams struct {
 	Type string
 }
 
-type GetErrorsParams struct {
+type ListErrorsParams struct {
+	Start      *time.Time
+	End        *time.Time
+	Limit      int64
+	OrderParam string
+	Order      string
+	Offset     int64
+}
+
+type CountErrorsParams struct {
 	Start *time.Time
 	End   *time.Time
 }
 
 type GetErrorParams struct {
-	ErrorType   string
+	GroupID   string
 	ErrorID   string
-	ServiceName string
+	Timestamp *time.Time
 }
 
 type FilterItem struct {

pkg/query-service/model/response.go

@@ -341,20 +341,36 @@ type Error struct {
 	LastSeen       time.Time `json:"lastSeen" ch:"lastSeen"`
 	FirstSeen      time.Time `json:"firstSeen" ch:"firstSeen"`
 	ServiceName    string    `json:"serviceName" ch:"serviceName"`
+	GroupID        string    `json:"groupID" ch:"groupID"`
 }
 
 type ErrorWithSpan struct {
 	ErrorID             string    `json:"errorId" ch:"errorID"`
 	ExceptionType       string    `json:"exceptionType" ch:"exceptionType"`
 	ExceptionStacktrace string    `json:"exceptionStacktrace" ch:"exceptionStacktrace"`
-	ExceptionEscaped    string    `json:"exceptionEscaped" ch:"exceptionEscaped"`
+	ExceptionEscaped    bool      `json:"exceptionEscaped" ch:"exceptionEscaped"`
 	ExceptionMsg        string    `json:"exceptionMessage" ch:"exceptionMessage"`
 	Timestamp           time.Time `json:"timestamp" ch:"timestamp"`
 	SpanID              string    `json:"spanID" ch:"spanID"`
 	TraceID             string    `json:"traceID" ch:"traceID"`
 	ServiceName         string    `json:"serviceName" ch:"serviceName"`
-	NewerErrorID        string    `json:"newerErrorId" ch:"newerErrorId"`
+	GroupID             string    `json:"groupID" ch:"groupID"`
-	OlderErrorID        string    `json:"olderErrorId" ch:"olderErrorId"`
+}
+
+type NextPrevErrorIDsDBResponse struct {
+	NextErrorID   string    `ch:"nextErrorID"`
+	NextTimestamp time.Time `ch:"nextTimestamp"`
+	PrevErrorID   string    `ch:"prevErrorID"`
+	PrevTimestamp time.Time `ch:"prevTimestamp"`
+	Timestamp     time.Time `ch:"timestamp"`
+}
+
+type NextPrevErrorIDs struct {
+	NextErrorID   string    `json:"nextErrorID"`
+	NextTimestamp time.Time `json:"nextTimestamp"`
+	PrevErrorID   string    `json:"prevErrorID"`
+	PrevTimestamp time.Time `json:"prevTimestamp"`
+	GroupID       string    `json:"groupID"`
 }
 
 type Series struct {