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s2db_arrow_reader_parallel_impl.go
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s2db_arrow_reader_parallel_impl.go
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package s2db_arrow_driver
import (
"context"
"crypto/md5"
"database/sql"
"fmt"
"math/rand"
"strconv"
"sync/atomic"
"github.com/apache/arrow/go/v12/arrow"
"golang.org/x/sync/errgroup"
)
type S2DBArrowReaderParallelImpl struct {
conn S2SqlDbWrapper
databaseName string
channelSize int64
resultTableConn *sql.Conn
resultTableName string
ch chan arrow.Record
errorGroup *errgroup.Group
ctx context.Context
enableQueryLogging bool
}
func getPartitionsCount(ctx context.Context, conn S2SqlDbWrapper, database string, loggingEnabled bool) (int32, error) {
query := fmt.Sprintf("SELECT num_partitions FROM information_schema.DISTRIBUTED_DATABASES WHERE database_name = '%s'", database)
rows, err := queryContext(ctx, conn, query, loggingEnabled)
if err != nil {
return 0, err
}
if !rows.Next() {
return 0, fmt.Errorf("database '%s' doesn't exist", database)
}
partitions := int32(1)
err = rows.Scan(&partitions)
if err != nil {
return 0, err
}
return partitions, nil
}
func generateTableName(query string) string {
return "goArrowResultTable_" + fmt.Sprintf("%x", md5.Sum([]byte(query))) + "_" + strconv.Itoa(rand.Intn(4294967295))
}
func NewS2DBArrowReaderParallelImpl(ctx context.Context, conf S2DBArrowReaderConfig) (S2DBArrowReader, error) {
partitions, err := getPartitionsCount(ctx, conf.Conn, conf.ParallelReadConfig.DatabaseName, conf.EnableQueryLogging)
if err != nil {
return nil, err
}
resultTableConn, err := conf.Conn.Conn(ctx)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
resultTableConn.Close()
}
}()
resultTableName := generateTableName(conf.Query)
createResultTableQuery := fmt.Sprintf("CREATE RESULT TABLE `%s` AS SELECT * FROM (%s)", resultTableName, conf.Query)
if !conf.UseClientConvesion {
createResultTableQuery += fmt.Sprintf(" OPTION(result_arrow_batch = %d)", conf.RecordSize)
}
if conf.ParallelReadConfig.EnableDebugProfiling {
profileQuery(conf.EnableQueryLogging, ctx, resultTableConn, conf.Query, conf.Args...)
}
if _, err = execContext(ctx, resultTableConn, createResultTableQuery, conf.EnableQueryLogging, conf.Args...); err != nil {
return nil, err
}
defer func() {
if err != nil {
dropQuery := fmt.Sprintf("DROP RESULT TABLE `%s`", resultTableName)
execContext(ctx, resultTableConn, dropQuery, conf.EnableQueryLogging)
}
}()
ch := make(chan arrow.Record, conf.ParallelReadConfig.ChannelSize)
finishedPartitions := int32(0)
errorGroup := new(errgroup.Group)
for i := int32(0); i < partitions; i++ {
partition := i
errorGroup.Go(
func() error {
defer func() {
atomic.AddInt32(&finishedPartitions, 1)
if atomic.LoadInt32(&finishedPartitions) == partitions {
close(ch)
}
}()
arrowReader, err := NewS2DBArrowReader(ctx, S2DBArrowReaderConfig{
Conn: conf.Conn,
Query: fmt.Sprintf("SELECT * FROM ::`%s` WHERE partition_id() = %d", resultTableName, partition),
RecordSize: conf.RecordSize,
EnableQueryLogging: conf.EnableQueryLogging,
UseClientConvesion: conf.UseClientConvesion,
})
if err != nil {
return err
}
defer arrowReader.Close()
for batch, err := arrowReader.GetNextArrowRecordBatch(); batch != nil; batch, err = arrowReader.GetNextArrowRecordBatch() {
if err != nil {
return err
}
ch <- batch
}
return nil
},
)
}
return &S2DBArrowReaderParallelImpl{
conn: conf.Conn,
databaseName: conf.ParallelReadConfig.DatabaseName,
channelSize: conf.ParallelReadConfig.ChannelSize,
resultTableConn: resultTableConn,
resultTableName: resultTableName,
ch: ch,
errorGroup: errorGroup,
ctx: ctx,
enableQueryLogging: conf.EnableQueryLogging,
}, nil
}
func (s2db *S2DBArrowReaderParallelImpl) GetNextArrowRecordBatch() (arrow.Record, error) {
res := <-s2db.ch
if res == nil {
return nil, s2db.errorGroup.Wait()
}
return res, nil
}
func (s2db *S2DBArrowReaderParallelImpl) Close() error {
if s2db.resultTableConn != nil {
dropQuery := fmt.Sprintf("DROP RESULT TABLE `%s`", s2db.resultTableName)
execContext(s2db.ctx, s2db.resultTableConn, dropQuery, s2db.enableQueryLogging)
return s2db.resultTableConn.Close()
}
return nil
}