func (c *CassandraDB) readRowRange(req db.RowRangeRequests, reqNum int) (returnVal *db.DataTable, err error) {
fs := req.FilteredSources[reqNum]
src := fs.Source
metricsFilter := fs.MetricsFilter
aggregatesFilter := fs.AggregatesFilter
configsFilter := fs.ConfigsFilter
startPrefix, endPrefix := dbcommon.MakeRowPrefixes(src, req.StartTimestamp,
req.EndTimestamp, true)
glog.V(3).Infoln("startPrefix", startPrefix)
glog.V(3).Infoln("endPrefix", endPrefix)
// Start multiple column family requests in the background.
var aggregationResultChan <-chan rowResults
if !req.NoReturnAggregates {
aggregationResultChan = getColumnFamilyRange(dbcommon.CFAggregates, c.pool, startPrefix, endPrefix, req.MaxResults)
}
var cfgResultChan <-chan rowResults
if req.ReturnConfigs {
cfgResultChan = getColumnFamilyRange(dbcommon.CFConfigs, c.pool, startPrefix, endPrefix, req.MaxResults)
}
dataTable := new(db.DataTable)
/////////////////////////////////////////////////////////////////////////////
// Read configs.
var excludeIdSet map[string]bool
if req.ReturnConfigs {
if configsFilter != nil {
excludeIdSet = make(map[string]bool)
}
cfgResult := <-cfgResultChan
if cfgResult.err != nil {
return nil, cfgResult.err
}
cfgRows := cfgResult.Rows
glog.V(3).Infoln("len(cfgRows)", len(cfgRows))
// Map from name to data slot to write data in data row.
columnNameReverseMap := make(map[string]int)
for _, cfgRow := range cfgRows {
if cfgRow == nil {
continue
}
// Created at least as much space as we know we'll use. For data that
// contains the same config names for every record (typical) this space
// allocation will not change after the first row read.
ctrow := make([]*string, len(dataTable.ConfigsColumnNames))
var rowMatch bool // Used only when configsFilter is set.
for _, column := range cfgRow.Columns {
columnName := string(column.Name)
valueStr := string(column.Value)
if (configsFilter != nil) && (configsFilter[columnName] == valueStr) {
rowMatch = true
}
if columnNameIndex, ok := columnNameReverseMap[columnName]; !ok { // Which slot to write data.
columnNameReverseMap[columnName] = len(dataTable.ConfigsColumnNames)
dataTable.ConfigsColumnNames = append(dataTable.ConfigsColumnNames, columnName)
ctrow = append(ctrow, &valueStr)
} else {
ctrow[columnNameIndex] = &valueStr
}
}
if (configsFilter != nil) && !rowMatch { // If not match, dump row and continue.
excludeIdSet[string(cfgRow.Key)] = true // Mark row as excluded for aggregates.
ctrow = nil // Mark as garbage
continue
}
dataTable.Configs = append(dataTable.Configs, &ctrow)
if req.NoReturnAggregates && req.ReturnIds {
dataTable.IdColumn = append(dataTable.IdColumn, string(cfgRow.Key))
}
}
t2 := time.Now()
dataTable.SortConfigsColumns()
glog.V(2).Infof("PERF: Config sort time: %v\n", time.Now().Sub(t2))
}
/////////////////////////////////////////////////////////////////////////////
// Read aggregates.
if !req.NoReturnAggregates {
aggregationResult := <-aggregationResultChan
if aggregationResult.err != nil {
return nil, aggregationResult.err
}
aggregateRows := aggregationResult.Rows
glog.V(3).Infoln("len(aggregateRows) = ", len(aggregateRows))
var totalAggregationTime time.Duration
// Map from name to data slot to write data in data row.
columnNameReverseMap := make(map[string]int)
dataTable.ColumnNames = append(dataTable.ColumnNames, common.TimeName) // First column.
for _, aggregatesRow := range aggregateRows {
if aggregatesRow == nil {
continue
}
if (configsFilter != nil) && excludeIdSet[string(aggregatesRow.Key)] {
continue
}
// Created at least as much space as we know we'll use. For data that
// contains the same metrics for every record (typical) this space
// allocation will not change after the first row read.
dtrow := make([]*float64, len(dataTable.ColumnNames))
dataTable.Data = append(dataTable.Data, &dtrow)
dtrow[0] = proto.Float64(float64(dbcommon.GetTimestamp(aggregatesRow.Key)))
if req.ReturnIds {
dataTable.IdColumn = append(dataTable.IdColumn, string(aggregatesRow.Key))
}
for _, column := range aggregatesRow.Columns {
if (metricsFilter != nil) && !metricsFilter[string(column.Name)] {
continue
}
aggregation := new(pb.Aggregation)
if err := proto.Unmarshal(column.Value, aggregation); err != nil {
return nil, errors.New("An error occured during aggregation unmarshalling.")
}
t0 := time.Now()
aggregation.MakeDouble()
fields, values := pb.GetDoubleFieldsAndValuesFiltered(aggregation,
aggregatesFilter, req.SetAggregateIfMissing)
totalAggregationTime += time.Now().Sub(t0)
for fieldIndex, field := range fields {
columnName := strings.Join([]string{string(column.Name), field}, ".")
val := values[fieldIndex]
if columnNameIndex, ok := columnNameReverseMap[columnName]; !ok { // Which slot to write data.
columnNameReverseMap[columnName] = len(dataTable.ColumnNames)
dataTable.ColumnNames = append(dataTable.ColumnNames, columnName)
dtrow = append(dtrow, val)
} else {
dtrow[columnNameIndex] = val
}
}
}
}
if len(dataTable.ColumnNames) == 1 {
return nil, errors.New("No results for: " + req.FilteredSources[reqNum].Source)
}
glog.V(3).Infof("PERF: accumulated aggregate unpacking time: %v\n", totalAggregationTime)
}
return dataTable, nil
}
func (c *CassandraDB) ReadRow(req db.RowRequest) (returnVal *db.ReadRecord, err error) {
// Start multiple requests in the background.
var aggResultChan <-chan rowResult
if !req.NoReturnAggregates {
aggResultChan = getColumnFamily(dbcommon.CFAggregates, c.pool, req.Id)
}
pointsResultChan := getColumnFamily(dbcommon.CFPoints, c.pool, req.Id)
srcResultChan := getColumnFamily(dbcommon.CFSource, c.pool, req.Id)
cfgResultChan := getColumnFamily(dbcommon.CFConfigs, c.pool, req.Id)
////////////////////////////////////////////////////////////////////////////
// Read Points.
pointsResult := <-pointsResultChan
if pointsResult.err != nil {
return nil, errors.New("An error occured reading points data.")
}
pointsRow := pointsResult.Row
readRecord := &db.ReadRecord{Points: make([]*[]*float64, 0)}
// Mapping from time to points data row. Note that we don't need a
// columnNameReverseMap as we do when reading rows to determine which slot to
// write the actual data because we are reading only one row which has a fixed
// set of column names.
pointsMap := make(map[int64]*[]*float64)
if pointsRow != nil {
readRecord.RecordTimestamp = proto.Int64(dbcommon.GetTimestamp(pointsRow.Key))
// Add time column with prepended "!" to force it to sort first. We remove
// the "!" after we're all done.
readRecord.PointsColumnNames = append(readRecord.PointsColumnNames, "!"+common.TimeName)
var checkedPointsTypeAlready bool
for colIdx, col := range pointsRow.Columns {
p := &pb.Points{}
if err := proto.Unmarshal(col.Value, p); err != nil {
return nil, errors.New("An error occured during points unmarshalling.")
}
if !checkedPointsTypeAlready {
checkedPointsTypeAlready = true
pointsDataType := p.Type
if pointsDataType != nil {
readRecord.PointsDataType = pointsDataType.String()
}
}
p.MakeValuesDouble()
if (len(p.DeltaTimestamps) > 0) && (len(p.DeltaTimestamps) == len(p.ValuesDouble)) {
var previousTS int64
for dataIdx, deltaTS := range p.DeltaTimestamps {
timestamp := deltaTS + previousTS
previousTS = timestamp
dataRow, ok := pointsMap[timestamp]
if !ok {
newDataRow := make([]*float64, len(pointsRow.Columns)+1) // Space for timestamp
tsVal := float64(timestamp) // Make copy.
newDataRow[0] = &tsVal
pointsMap[timestamp] = &newDataRow
dataRow = &newDataRow
}
(*dataRow)[colIdx+1] = &p.ValuesDouble[dataIdx]
}
} else { // Either no timestamps or timestamps and data were different lengths.
for timestamp, val := range p.ValuesDouble { // Use monotonic increasing timestamp.
dataRow, ok := pointsMap[int64(timestamp)]
if !ok {
newDataRow := make([]*float64, len(pointsRow.Columns)+1) // Space for timestamp
tsVal := float64(timestamp) // Make copy.
newDataRow[0] = &tsVal
pointsMap[int64(timestamp)] = &newDataRow
dataRow = &newDataRow
}
floatVal := val // Make copy.
(*dataRow)[colIdx+1] = &floatVal
}
}
readRecord.PointsColumnNames = append(readRecord.PointsColumnNames, string(col.Name))
}
// Attach rows to readRecord.Points in order:
// First obtain sorted list of keys.
var allKeys []int64
for k := range pointsMap {
allKeys = append(allKeys, k)
}
sort.Sort(common.Int64Slice(allKeys))
// Now attach rows.
for _, k := range allKeys {
readRecord.Points = append(readRecord.Points, pointsMap[k])
}
readRecord.SortPoints()
readRecord.PointsColumnNames[0] = common.TimeName
}
////////////////////////////////////////////////////////////////////////////
// Read Src.
srcResult := <-srcResultChan
if srcResult.err != nil {
// return nil, errors.New("An error occured reading src data.")
return nil, srcResult.err
}
srcRow := srcResult.Row
if srcRow != nil {
if len(srcRow.Columns) > 0 {
sourceStr := string(srcRow.Columns[0].Name)
readRecord.Source = &sourceStr
}
}
////////////////////////////////////////////////////////////////////////////
// Read Aggregates.
if !req.NoReturnAggregates {
aggResult := <-aggResultChan
if aggResult.err != nil {
return nil, errors.New("An error occured reading aggregate data.")
}
aggRow := aggResult.Row
if aggRow != nil {
if readRecord.RecordTimestamp == nil {
readRecord.RecordTimestamp = proto.Int64(dbcommon.GetTimestamp(aggRow.Key))
}
var checkedAggregatesTypeAlready bool
for _, column := range aggRow.Columns {
aggregation := new(pb.Aggregation)
if err := proto.Unmarshal(column.Value, aggregation); err != nil {
return nil, errors.New("An error occured during aggregation unmarshalling.")
}
aggregation.MakeDouble()
if !checkedAggregatesTypeAlready { // We set all for a record to the same.
checkedAggregatesTypeAlready = true
aggregatesDataType := aggregation.Type
if aggregatesDataType != nil {
readRecord.AggregatesDataType = aggregatesDataType.String()
}
}
fields, values := pb.GetDoubleFieldsAndValues(aggregation)
for fieldIndex, field := range fields {
columnName := strings.Join([]string{string(column.Name), field}, ".")
readRecord.AggregatesColumnNames = append(readRecord.AggregatesColumnNames, columnName)
readRecord.Aggregates = append(readRecord.Aggregates, values[fieldIndex])
}
}
readRecord.SortAggregates()
}
}
////////////////////////////////////////////////////////////////////////////
// Read Configs.
cfgResult := <-cfgResultChan
if cfgResult.err != nil {
return nil, errors.New("An error occured reading config data.")
}
cfgRow := cfgResult.Row
if cfgRow != nil {
if readRecord.RecordTimestamp == nil {
readRecord.RecordTimestamp = proto.Int64(dbcommon.GetTimestamp(cfgRow.Key))
}
readRecord.ConfigPairs = make(map[string]string)
for _, column := range cfgRow.Columns {
readRecord.ConfigPairs[string(column.Name)] = string(column.Value)
}
}
return readRecord, nil
}