Ejemplo n.º 1
0
func (self *Shard) Query(querySpec *parser.QuerySpec, processor cluster.QueryProcessor) error {
	if querySpec.IsListSeriesQuery() {
		return self.executeListSeriesQuery(querySpec, processor)
	} else if querySpec.IsDeleteFromSeriesQuery() {
		return self.executeDeleteQuery(querySpec, processor)
	}

	seriesAndColumns := querySpec.SelectQuery().GetReferencedColumns()

	if !self.hasReadAccess(querySpec) {
		return errors.New("User does not have access to one or more of the series requested.")
	}

	for series, columns := range seriesAndColumns {
		if regex, ok := series.GetCompiledRegex(); ok {
			seriesNames := self.metaStore.GetSeriesForDatabaseAndRegex(querySpec.Database(), regex)
			for _, name := range seriesNames {
				if !querySpec.HasReadAccess(name) {
					continue
				}
				err := self.executeQueryForSeries(querySpec, name, columns, processor)
				if err != nil {
					return err
				}
			}
		} else {
			err := self.executeQueryForSeries(querySpec, series.Name, columns, processor)
			if err != nil {
				return err
			}
		}
	}
	return nil
}
Ejemplo n.º 2
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func (self *Coordinator) runListSeriesQuery(querySpec *parser.QuerySpec, p engine.Processor) error {
	allSeries := self.clusterConfiguration.MetaStore.GetSeriesForDatabase(querySpec.Database())
	matchingSeries := allSeries
	if q := querySpec.Query().GetListSeriesQuery(); q.HasRegex() {
		matchingSeries = nil
		regex := q.GetRegex()
		for _, s := range allSeries {
			if !regex.MatchString(s) {
				continue
			}
			matchingSeries = append(matchingSeries, s)
		}
	}
	name := "list_series_result"
	fields := []string{"name"}
	points := make([]*protocol.Point, len(matchingSeries), len(matchingSeries))

	for i, s := range matchingSeries {
		fieldValues := []*protocol.FieldValue{{StringValue: proto.String(s)}}
		points[i] = &protocol.Point{Values: fieldValues}
	}

	seriesResult := &protocol.Series{Name: &name, Fields: fields, Points: points}
	_, err := p.Yield(seriesResult)
	return err
}
Ejemplo n.º 3
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func (self *LevelDbShard) executeListSeriesQuery(querySpec *parser.QuerySpec, processor cluster.QueryProcessor) error {
	it := self.db.NewIterator(self.readOptions)
	defer it.Close()

	database := querySpec.Database()
	seekKey := append(DATABASE_SERIES_INDEX_PREFIX, []byte(querySpec.Database()+"~")...)
	it.Seek(seekKey)
	dbNameStart := len(DATABASE_SERIES_INDEX_PREFIX)
	for it = it; it.Valid(); it.Next() {
		key := it.Key()
		if len(key) < dbNameStart || !bytes.Equal(key[:dbNameStart], DATABASE_SERIES_INDEX_PREFIX) {
			break
		}
		dbSeries := string(key[dbNameStart:])
		parts := strings.Split(dbSeries, "~")
		if len(parts) > 1 {
			if parts[0] != database {
				break
			}
			name := parts[1]
			shouldContinue := processor.YieldPoint(&name, nil, nil)
			if !shouldContinue {
				return nil
			}
		}
	}
	return nil
}
func (self *ClusterConfiguration) getShardsToMatchQuery(querySpec *parser.QuerySpec) ([]*ShardData, error) {
	self.shardLock.RLock()
	defer self.shardLock.RUnlock()
	seriesNames, fromRegex := querySpec.TableNamesAndRegex()
	db := querySpec.Database()
	if fromRegex != nil {
		seriesNames = self.MetaStore.GetSeriesForDatabaseAndRegex(db, fromRegex)
	}
	uniqueShards := make(map[uint32]*ShardData)
	for _, name := range seriesNames {
		if fs := self.MetaStore.GetFieldsForSeries(db, name); len(fs) == 0 {
			return nil, fmt.Errorf("Couldn't find series: %s", name)
		}
		space := self.getShardSpaceToMatchSeriesName(db, name)
		if space == nil {
			continue
		}
		for _, shard := range space.shards {
			uniqueShards[shard.id] = shard
		}
	}
	shards := make([]*ShardData, 0, len(uniqueShards))
	for _, shard := range uniqueShards {
		shards = append(shards, shard)
	}
	SortShardsByTimeDescending(shards)
	return shards, nil
}
Ejemplo n.º 5
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func (self *Shard) executeArrayQuery(querySpec *parser.QuerySpec, processor engine.Processor) error {
	seriesAndColumns := querySpec.SelectQuery().GetReferencedColumns()

	for series, columns := range seriesAndColumns {
		if regex, ok := series.GetCompiledRegex(); ok {
			seriesNames := self.metaStore.GetSeriesForDatabaseAndRegex(querySpec.Database(), regex)
			for _, name := range seriesNames {
				if !querySpec.HasReadAccess(name) {
					continue
				}
				err := self.executeQueryForSeries(querySpec, name, columns, processor)
				if err != nil {
					return err
				}
			}
		} else {
			err := self.executeQueryForSeries(querySpec, series.Name, columns, processor)
			if err != nil {
				return err
			}
		}
	}

	return nil
}
Ejemplo n.º 6
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func (self *Shard) executeQueryForSeries(querySpec *parser.QuerySpec, seriesName string, columns []string, processor engine.Processor) error {
	fields, err := self.getFieldsForSeries(querySpec.Database(), seriesName, columns)
	if err != nil {
		log.Error("Error looking up fields for %s: %s", seriesName, err)
		return err
	}

	if querySpec.IsSinglePointQuery() {
		log.Debug("Running single query for series %s, fields %v", seriesName, fields)
		return self.executeSinglePointQuery(querySpec, seriesName, fields, processor)
	}

	startTime := querySpec.GetStartTime()
	endTime := querySpec.GetEndTime()

	query := querySpec.SelectQuery()

	aliases := query.GetTableAliases(seriesName)

	fieldNames, iterators := self.getIterators(fields, startTime, endTime, query.Ascending)
	seriesOutgoing := &protocol.Series{Name: protocol.String(seriesName), Fields: fieldNames, Points: make([]*protocol.Point, 0, self.pointBatchSize)}
	pi := NewPointIterator(iterators, fields, querySpec.GetStartTime(), querySpec.GetEndTime(), query.Ascending)
	defer pi.Close()

	for pi.Valid() {
		p := pi.Point()
		seriesOutgoing.Points = append(seriesOutgoing.Points, p)
		if len(seriesOutgoing.Points) >= self.pointBatchSize {
			ok, err := yieldToProcessor(seriesOutgoing, processor, aliases)
			if !ok || err != nil {
				log.Debug("Stopping processing.")
				if err != nil {
					log.Error("Error while processing data: %v", err)
					return err
				}
			}
			seriesOutgoing = &protocol.Series{Name: protocol.String(seriesName), Fields: fieldNames, Points: make([]*protocol.Point, 0, self.pointBatchSize)}
		}

		pi.Next()
	}

	if err := pi.Error(); err != nil {
		return err
	}

	//Yield remaining data
	if ok, err := yieldToProcessor(seriesOutgoing, processor, aliases); !ok || err != nil {
		log.Debug("Stopping processing remaining points...")
		if err != nil {
			log.Error("Error while processing data: %v", err)
			return err
		}
	}

	log.Debug("Finished running query %s", query.GetQueryString())
	return nil
}
Ejemplo n.º 7
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func (self *CoordinatorImpl) runDeleteQuery(querySpec *parser.QuerySpec, seriesWriter SeriesWriter) error {
	user := querySpec.User()
	db := querySpec.Database()
	if ok, err := self.permissions.AuthorizeDeleteQuery(user, db); !ok {
		return err
	}
	querySpec.RunAgainstAllServersInShard = true
	return self.runQuerySpec(querySpec, seriesWriter)
}
Ejemplo n.º 8
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func (self *LevelDbShard) executeDropSeriesQuery(querySpec *parser.QuerySpec, processor cluster.QueryProcessor) error {
	database := querySpec.Database()
	series := querySpec.Query().DropSeriesQuery.GetTableName()
	err := self.dropSeries(database, series)
	if err != nil {
		return err
	}
	self.compact()
	return nil
}
Ejemplo n.º 9
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func (self *Coordinator) expandRegex(spec *parser.QuerySpec) {
	q := spec.SelectQuery()
	if q == nil {
		return
	}

	f := func(r *regexp.Regexp) []string {
		return self.clusterConfiguration.MetaStore.GetSeriesForDatabaseAndRegex(spec.Database(), r)
	}

	parser.RewriteMergeQuery(q, f)
}
Ejemplo n.º 10
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func (self *Coordinator) runDropSeriesQuery(querySpec *parser.QuerySpec) error {
	user := querySpec.User()
	db := querySpec.Database()
	series := querySpec.Query().DropSeriesQuery.GetTableName()
	if ok, err := self.permissions.AuthorizeDropSeries(user, db, series); !ok {
		return err
	}
	err := self.raftServer.DropSeries(db, series)
	if err != nil {
		return err
	}
	return nil
}
Ejemplo n.º 11
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func (self *Coordinator) runListSeriesQuery(querySpec *parser.QuerySpec, p engine.Processor) error {
	allSeries := self.clusterConfiguration.MetaStore.GetSeriesForDatabase(querySpec.Database())
	matchingSeries := allSeries
	q := querySpec.Query().GetListSeriesQuery()
	if q.HasRegex() {
		matchingSeries = nil
		regex := q.GetRegex()
		for _, s := range allSeries {
			if !regex.MatchString(s) {
				continue
			}
			matchingSeries = append(matchingSeries, s)
		}
	}
	name := "list_series_result"
	var fields []string
	points := make([]*protocol.Point, len(matchingSeries))

	if q.IncludeSpaces {
		fields = []string{"name", "space"}
		spaces := self.clusterConfiguration.GetShardSpacesForDatabase(querySpec.Database())

		for i, s := range matchingSeries {
			spaceName := ""
			for _, sp := range spaces {
				if sp.MatchesSeries(s) {
					spaceName = sp.Name
					break
				}
			}
			fieldValues := []*protocol.FieldValue{
				{StringValue: proto.String(s)},
				{StringValue: proto.String(spaceName)},
			}
			points[i] = &protocol.Point{Values: fieldValues}
		}
	} else {
		fields = []string{"name"}
		for i, s := range matchingSeries {
			fieldValues := []*protocol.FieldValue{
				{StringValue: proto.String(s)},
			}
			points[i] = &protocol.Point{Values: fieldValues}
		}
	}

	seriesResult := &protocol.Series{Name: &name, Fields: fields, Points: points}
	_, err := p.Yield(seriesResult)
	return err
}
Ejemplo n.º 12
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func (self *Shard) executeSinglePointQuery(querySpec *parser.QuerySpec, name string, columns []string, p engine.Processor) error {
	fields, err := self.getFieldsForSeries(querySpec.Database(), name, columns)
	if err != nil {
		log.Error("Error looking up fields for %s: %s", name, err)
		return err
	}

	query := querySpec.SelectQuery()
	fieldCount := len(fields)
	fieldNames := make([]string, 0, fieldCount)
	point := &protocol.Point{Values: make([]*protocol.FieldValue, 0, fieldCount)}
	timestamp := common.TimeToMicroseconds(query.GetStartTime())
	sequenceNumber, err := query.GetSinglePointQuerySequenceNumber()
	if err != nil {
		return err
	}

	// set the timestamp and sequence number
	point.SequenceNumber = &sequenceNumber
	point.SetTimestampInMicroseconds(timestamp)

	for _, field := range fields {
		sk := newStorageKey(field.Id, timestamp, sequenceNumber)
		data, err := self.db.Get(sk.bytes())
		if err != nil {
			return err
		}

		if data == nil {
			continue
		}

		fieldValue := &protocol.FieldValue{}
		err = proto.Unmarshal(data, fieldValue)
		if err != nil {
			return err
		}
		fieldNames = append(fieldNames, field.Name)
		point.Values = append(point.Values, fieldValue)
	}

	result := &protocol.Series{Name: &name, Fields: fieldNames, Points: []*protocol.Point{point}}

	if len(result.Points) > 0 {
		_, err := p.Yield(result)
		return err
	}
	return nil
}
Ejemplo n.º 13
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func (self *CoordinatorImpl) runDropSeriesQuery(querySpec *parser.QuerySpec, seriesWriter SeriesWriter) error {
	user := querySpec.User()
	db := querySpec.Database()
	series := querySpec.Query().DropSeriesQuery.GetTableName()
	if ok, err := self.permissions.AuthorizeDropSeries(user, db, series); !ok {
		return err
	}
	defer seriesWriter.Close()
	fmt.Println("DROP series")
	err := self.raftServer.DropSeries(db, series)
	if err != nil {
		return err
	}
	fmt.Println("DROP returning nil")
	return nil
}
Ejemplo n.º 14
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func (self *ShardData) createRequest(querySpec *parser.QuerySpec) *p.Request {
	queryString := querySpec.GetQueryStringWithTimeCondition()
	user := querySpec.User()
	userName := user.GetName()
	database := querySpec.Database()
	isDbUser := !user.IsClusterAdmin()

	return &p.Request{
		Type:     p.Request_QUERY.Enum(),
		ShardId:  &self.id,
		Query:    &queryString,
		UserName: &userName,
		Database: &database,
		IsDbUser: &isDbUser,
	}
}
Ejemplo n.º 15
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func (self *CoordinatorImpl) runListSeriesQuery(querySpec *parser.QuerySpec, seriesWriter SeriesWriter) error {
	series := self.clusterConfiguration.MetaStore.GetSeriesForDatabase(querySpec.Database())
	name := "list_series_result"
	fields := []string{"name"}
	points := make([]*protocol.Point, len(series), len(series))

	for i, s := range series {
		fieldValues := []*protocol.FieldValue{{StringValue: proto.String(s)}}
		points[i] = &protocol.Point{Values: fieldValues}
	}

	seriesResult := &protocol.Series{Name: &name, Fields: fields, Points: points}
	seriesWriter.Write(seriesResult)
	seriesWriter.Close()
	return nil
}
Ejemplo n.º 16
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func (self *Shard) getPointIteratorForSeries(querySpec *parser.QuerySpec, name string, columns []string) ([]string, *PointIterator, error) {
	fields, err := self.getFieldsForSeries(querySpec.Database(), name, columns)
	if err != nil {
		log.Error("Error looking up fields for %s: %s", name, err)
		return nil, nil, err
	}

	startTime := querySpec.GetStartTime()
	endTime := querySpec.GetEndTime()

	query := querySpec.SelectQuery()

	iterators := self.getIterators(fields, startTime, endTime, query.Ascending)
	pi := NewPointIterator(iterators, fields, querySpec.GetStartTime(), querySpec.GetEndTime(), query.Ascending)

	columns = make([]string, len(fields))
	for i := range fields {
		columns[i] = fields[i].Name
	}

	return columns, pi, nil
}
Ejemplo n.º 17
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func (self *Shard) executeDeleteQuery(querySpec *parser.QuerySpec, processor engine.Processor) error {
	query := querySpec.DeleteQuery()
	series := query.GetFromClause()
	database := querySpec.Database()
	if series.Type != parser.FromClauseArray {
		return fmt.Errorf("Merge and Inner joins can't be used with a delete query: %v", series.Type)
	}

	for _, name := range series.Names {
		var err error
		if regex, ok := name.Name.GetCompiledRegex(); ok {
			err = self.deleteRangeOfRegex(database, regex, query.GetStartTime(), query.GetEndTime())
		} else {
			err = self.deleteRangeOfSeries(database, name.Name.Name, query.GetStartTime(), query.GetEndTime())
		}

		if err != nil {
			return err
		}
	}
	self.db.Compact()
	return nil
}
Ejemplo n.º 18
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func (self *ClusterConfiguration) getShardsToMatchQuery(querySpec *parser.QuerySpec) []*ShardData {
	self.shardLock.RLock()
	defer self.shardLock.RUnlock()
	seriesNames, fromRegex := querySpec.TableNamesAndRegex()
	if fromRegex != nil {
		seriesNames = self.MetaStore.GetSeriesForDatabaseAndRegex(querySpec.Database(), fromRegex)
	}
	uniqueShards := make(map[uint32]*ShardData)
	for _, name := range seriesNames {
		space := self.getShardSpaceToMatchSeriesName(querySpec.Database(), name)
		if space == nil {
			continue
		}
		for _, shard := range space.shards {
			uniqueShards[shard.id] = shard
		}
	}
	shards := make([]*ShardData, 0, len(uniqueShards))
	for _, shard := range uniqueShards {
		shards = append(shards, shard)
	}
	SortShardsByTimeDescending(shards)
	return shards
}
Ejemplo n.º 19
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func (self *ShardData) Query(querySpec *parser.QuerySpec, response chan<- *p.Response) {
	log.Debug("QUERY: shard %d, query '%s'", self.Id(), querySpec.GetQueryStringWithTimeCondition())
	defer common.RecoverFunc(querySpec.Database(), querySpec.GetQueryStringWithTimeCondition(), func(err interface{}) {
		response <- &p.Response{
			Type:         p.Response_ERROR.Enum(),
			ErrorMessage: p.String(fmt.Sprintf("%s", err)),
		}
	})

	// This is only for queries that are deletes or drops. They need to be sent everywhere as opposed to just the local or one of the remote shards.
	// But this boolean should only be set to true on the server that receives the initial query.
	if querySpec.RunAgainstAllServersInShard {
		if querySpec.IsDeleteFromSeriesQuery() {
			self.logAndHandleDeleteQuery(querySpec, response)
		} else if querySpec.IsDropSeriesQuery() {
			self.logAndHandleDropSeriesQuery(querySpec, response)
		}
	}

	if self.IsLocal {
		var processor engine.Processor = NewResponseChannelProcessor(NewResponseChannelWrapper(response))
		var err error

		processor = NewShardIdInserterProcessor(self.Id(), processor)

		processor, err = self.getProcessor(querySpec, processor)
		if err != nil {
			response <- &p.Response{
				Type:         p.Response_ERROR.Enum(),
				ErrorMessage: p.String(err.Error()),
			}
			log.Error("Error while creating engine: %s", err)
			return
		}
		shard, err := self.store.GetOrCreateShard(self.id)
		if err != nil {
			response <- &p.Response{
				Type:         p.Response_ERROR.Enum(),
				ErrorMessage: p.String(err.Error()),
			}
			log.Error("Error while getting shards: %s", err)
			return
		}
		defer self.store.ReturnShard(self.id)

		log.Debug("Processor chain:  %s\n", engine.ProcessorChain(processor))

		err = shard.Query(querySpec, processor)
		// if we call Close() in case of an error it will mask the error
		if err != nil {
			response <- &p.Response{
				Type:         p.Response_ERROR.Enum(),
				ErrorMessage: p.String(err.Error()),
			}
			return
		}
		processor.Close()
		response <- &p.Response{Type: p.Response_END_STREAM.Enum()}
		return
	}

	if server := self.randomHealthyServer(); server != nil {
		log.Debug("Querying server %d for shard %d", server.GetId(), self.Id())
		request := self.createRequest(querySpec)
		server.MakeRequest(request, response)
		return
	}

	message := fmt.Sprintf("No servers up to query shard %d", self.id)
	response <- &p.Response{
		Type:         p.Response_ERROR.Enum(),
		ErrorMessage: &message,
	}
	log.Error(message)
}
Ejemplo n.º 20
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func (self *ShardData) Query(querySpec *parser.QuerySpec, response chan *p.Response) {
	log.Debug("QUERY: shard %d, query '%s'", self.Id(), querySpec.GetQueryString())
	defer common.RecoverFunc(querySpec.Database(), querySpec.GetQueryString(), func(err interface{}) {
		response <- &p.Response{Type: &endStreamResponse, ErrorMessage: p.String(fmt.Sprintf("%s", err))}
	})

	// This is only for queries that are deletes or drops. They need to be sent everywhere as opposed to just the local or one of the remote shards.
	// But this boolean should only be set to true on the server that receives the initial query.
	if querySpec.RunAgainstAllServersInShard {
		if querySpec.IsDeleteFromSeriesQuery() {
			self.logAndHandleDeleteQuery(querySpec, response)
		} else if querySpec.IsDropSeriesQuery() {
			self.logAndHandleDropSeriesQuery(querySpec, response)
		}
	}

	if self.IsLocal {
		var processor QueryProcessor
		var err error

		if querySpec.IsListSeriesQuery() {
			processor = engine.NewListSeriesEngine(response)
		} else if querySpec.IsDeleteFromSeriesQuery() || querySpec.IsDropSeriesQuery() || querySpec.IsSinglePointQuery() {
			maxDeleteResults := 10000
			processor = engine.NewPassthroughEngine(response, maxDeleteResults)
		} else {
			query := querySpec.SelectQuery()
			if self.ShouldAggregateLocally(querySpec) {
				log.Debug("creating a query engine")
				processor, err = engine.NewQueryEngine(query, response)
				if err != nil {
					response <- &p.Response{Type: &endStreamResponse, ErrorMessage: p.String(err.Error())}
					log.Error("Error while creating engine: %s", err)
					return
				}
				processor.SetShardInfo(int(self.Id()), self.IsLocal)
			} else if query.HasAggregates() {
				maxPointsToBufferBeforeSending := 1000
				log.Debug("creating a passthrough engine")
				processor = engine.NewPassthroughEngine(response, maxPointsToBufferBeforeSending)
			} else {
				maxPointsToBufferBeforeSending := 1000
				log.Debug("creating a passthrough engine with limit")
				processor = engine.NewPassthroughEngineWithLimit(response, maxPointsToBufferBeforeSending, query.Limit)
			}

			if query.GetFromClause().Type != parser.FromClauseInnerJoin {
				// Joins do their own filtering since we need to get all
				// points before filtering. This is due to the fact that some
				// where expressions will be difficult to compute before the
				// points are joined together, think where clause with
				// left.column = 'something' or right.column =
				// 'something_else'. We can't filter the individual series
				// separately. The filtering happens in merge.go:55

				processor = engine.NewFilteringEngine(query, processor)
			}
		}
		shard, err := self.store.GetOrCreateShard(self.id)
		if err != nil {
			response <- &p.Response{Type: &endStreamResponse, ErrorMessage: p.String(err.Error())}
			log.Error("Error while getting shards: %s", err)
			return
		}
		defer self.store.ReturnShard(self.id)
		err = shard.Query(querySpec, processor)
		// if we call Close() in case of an error it will mask the error
		if err != nil {
			response <- &p.Response{Type: &endStreamResponse, ErrorMessage: p.String(err.Error())}
			return
		}
		processor.Close()
		response <- &p.Response{Type: &endStreamResponse}
		return
	}

	if server := self.randomHealthyServer(); server != nil {
		log.Debug("Querying server %d for shard %d", server.GetId(), self.Id())
		request := self.createRequest(querySpec)
		server.MakeRequest(request, response)
		return
	}

	message := fmt.Sprintf("No servers up to query shard %d", self.id)
	response <- &p.Response{Type: &endStreamResponse, ErrorMessage: &message}
	log.Error(message)
}
Ejemplo n.º 21
0
func (self *Shard) executeQueryForSeries(querySpec *parser.QuerySpec, seriesName string, columns []string, processor cluster.QueryProcessor) error {
	startTimeBytes := self.byteArrayForTime(querySpec.GetStartTime())
	endTimeBytes := self.byteArrayForTime(querySpec.GetEndTime())

	fields, err := self.getFieldsForSeries(querySpec.Database(), seriesName, columns)
	if err != nil {
		log.Error("Error looking up fields for %s: %s", seriesName, err)
		return err
	}

	fieldCount := len(fields)
	rawColumnValues := make([]rawColumnValue, fieldCount, fieldCount)
	query := querySpec.SelectQuery()

	aliases := query.GetTableAliases(seriesName)
	if querySpec.IsSinglePointQuery() {
		series, err := self.fetchSinglePoint(querySpec, seriesName, fields)
		if err != nil {
			log.Error("Error reading a single point: %s", err)
			return err
		}
		if len(series.Points) > 0 {
			processor.YieldPoint(series.Name, series.Fields, series.Points[0])
		}
		return nil
	}

	fieldNames, iterators := self.getIterators(fields, startTimeBytes, endTimeBytes, query.Ascending)
	defer func() {
		for _, it := range iterators {
			it.Close()
		}
	}()

	seriesOutgoing := &protocol.Series{Name: protocol.String(seriesName), Fields: fieldNames, Points: make([]*protocol.Point, 0, self.pointBatchSize)}

	// TODO: clean up, this is super gnarly
	// optimize for the case where we're pulling back only a single column or aggregate
	buffer := bytes.NewBuffer(nil)
	valueBuffer := proto.NewBuffer(nil)
	for {
		isValid := false
		point := &protocol.Point{Values: make([]*protocol.FieldValue, fieldCount, fieldCount)}

		for i, it := range iterators {
			if rawColumnValues[i].value != nil || !it.Valid() {
				if err := it.Error(); err != nil {
					return err
				}
				continue
			}

			key := it.Key()
			if len(key) < 16 {
				continue
			}

			if !isPointInRange(fields[i].IdAsBytes(), startTimeBytes, endTimeBytes, key) {
				continue
			}

			value := it.Value()
			sequenceNumber := key[16:]

			rawTime := key[8:16]
			rawColumnValues[i] = rawColumnValue{time: rawTime, sequence: sequenceNumber, value: value}
		}

		var pointTimeRaw []byte
		var pointSequenceRaw []byte
		// choose the highest (or lowest in case of ascending queries) timestamp
		// and sequence number. that will become the timestamp and sequence of
		// the next point.
		for _, value := range rawColumnValues {
			if value.value == nil {
				continue
			}

			pointTimeRaw, pointSequenceRaw = value.updatePointTimeAndSequence(pointTimeRaw,
				pointSequenceRaw, query.Ascending)
		}

		for i, iterator := range iterators {
			// if the value is nil or doesn't match the point's timestamp and sequence number
			// then skip it
			if rawColumnValues[i].value == nil ||
				!bytes.Equal(rawColumnValues[i].time, pointTimeRaw) ||
				!bytes.Equal(rawColumnValues[i].sequence, pointSequenceRaw) {

				point.Values[i] = &protocol.FieldValue{IsNull: &TRUE}
				continue
			}

			// if we emitted at lease one column, then we should keep
			// trying to get more points
			isValid = true

			// advance the iterator to read a new value in the next iteration
			if query.Ascending {
				iterator.Next()
			} else {
				iterator.Prev()
			}

			fv := &protocol.FieldValue{}
			valueBuffer.SetBuf(rawColumnValues[i].value)
			err := valueBuffer.Unmarshal(fv)
			if err != nil {
				log.Error("Error while running query: %s", err)
				return err
			}
			point.Values[i] = fv
			rawColumnValues[i].value = nil
		}

		var sequence uint64
		var t uint64

		// set the point sequence number and timestamp
		buffer.Reset()
		buffer.Write(pointSequenceRaw)
		binary.Read(buffer, binary.BigEndian, &sequence)
		buffer.Reset()
		buffer.Write(pointTimeRaw)
		binary.Read(buffer, binary.BigEndian, &t)

		time := self.convertUintTimestampToInt64(&t)
		point.SetTimestampInMicroseconds(time)
		point.SequenceNumber = &sequence

		// stop the loop if we ran out of points
		if !isValid {
			break
		}

		shouldContinue := true

		seriesOutgoing.Points = append(seriesOutgoing.Points, point)

		if len(seriesOutgoing.Points) >= self.pointBatchSize {
			for _, alias := range aliases {
				series := &protocol.Series{
					Name:   proto.String(alias),
					Fields: fieldNames,
					Points: seriesOutgoing.Points,
				}
				if !processor.YieldSeries(series) {
					log.Info("Stopping processing")
					shouldContinue = false
				}
			}
			seriesOutgoing = &protocol.Series{Name: protocol.String(seriesName), Fields: fieldNames, Points: make([]*protocol.Point, 0, self.pointBatchSize)}
		}

		if !shouldContinue {
			break
		}
	}

	//Yield remaining data
	for _, alias := range aliases {
		log.Debug("Final Flush %s", alias)
		series := &protocol.Series{Name: protocol.String(alias), Fields: seriesOutgoing.Fields, Points: seriesOutgoing.Points}
		if !processor.YieldSeries(series) {
			log.Debug("Cancelled...")
		}
	}

	log.Debug("Finished running query %s", query.GetQueryString())
	return nil
}
Ejemplo n.º 22
0
func (self *Shard) executeListSeriesQuery(querySpec *parser.QuerySpec, processor cluster.QueryProcessor) error {
	return self.yieldSeriesNamesForDb(querySpec.Database(), func(_name string) bool {
		name := _name
		return processor.YieldPoint(&name, nil, nil)
	})
}