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block_querier_symbols.go
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/
block_querier_symbols.go
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package phlaredb
import (
"context"
"errors"
"fmt"
"io"
"github.com/grafana/dskit/multierror"
"github.com/grafana/dskit/runutil"
"github.com/parquet-go/parquet-go"
"golang.org/x/sync/errgroup"
"github.com/grafana/pyroscope/pkg/iter"
phlareobj "github.com/grafana/pyroscope/pkg/objstore"
parquetobj "github.com/grafana/pyroscope/pkg/objstore/parquet"
"github.com/grafana/pyroscope/pkg/phlaredb/block"
schemav1 "github.com/grafana/pyroscope/pkg/phlaredb/schemas/v1"
"github.com/grafana/pyroscope/pkg/phlaredb/symdb"
"github.com/grafana/pyroscope/pkg/util"
)
// TODO(kolesnikovae) Decouple from phlaredb and refactor to symdb/compat.
type symbolsResolver interface {
symdb.SymbolsReader
io.Closer
Load(context.Context) error
}
type symbolsResolverV1 struct {
stacktraces parquetReader[*schemav1.Stacktrace, *schemav1.StacktracePersister]
bucketReader phlareobj.Bucket
*inMemoryParquetTables
}
func newSymbolsResolverV1(ctx context.Context, bucketReader phlareobj.Bucket, meta *block.Meta) (*symbolsResolverV1, error) {
r := &symbolsResolverV1{bucketReader: bucketReader}
p := r.stacktraces.relPath()
for _, f := range meta.Files {
if f.RelPath == p {
r.stacktraces.meta = f
break
}
}
var err error
if err = r.stacktraces.open(ctx, r.bucketReader); err != nil {
return nil, err
}
r.inMemoryParquetTables, err = openInMemoryParquetTables(ctx, bucketReader, meta)
return r, err
}
func (r *symbolsResolverV1) Load(_ context.Context) error {
// Unsupported.
return nil
}
func (r *symbolsResolverV1) Close() error {
return multierror.New(
r.stacktraces.Close(),
r.inMemoryParquetTables.Close()).
Err()
}
func (r *symbolsResolverV1) Partition(_ context.Context, _ uint64) (symdb.PartitionReader, error) {
p := symbolsPartition{
stats: symdb.PartitionStats{
StacktracesTotal: int(r.stacktraces.file.NumRows()),
MaxStacktraceID: int(r.stacktraces.file.NumRows()),
LocationsTotal: len(r.locations.cache),
MappingsTotal: len(r.mappings.cache),
FunctionsTotal: len(r.functions.cache),
StringsTotal: len(r.strings.cache),
},
symbols: &symdb.Symbols{
Stacktraces: stacktraceResolverV1{r: r},
Locations: r.locations.cache,
Mappings: r.mappings.cache,
Functions: r.functions.cache,
Strings: r.strings.cache,
},
}
return &p, nil
}
type stacktraceResolverV1 struct{ r *symbolsResolverV1 }
func (r stacktraceResolverV1) ResolveStacktraceLocations(ctx context.Context, dst symdb.StacktraceInserter, stacktraces []uint32) error {
it := repeatedColumnIter(ctx, r.r.stacktraces.file, "LocationIDs.list.element", iter.NewSliceIterator(stacktraces))
defer it.Close()
t := make([]int32, 0, 64)
for it.Next() {
s := it.At()
t = grow(t, len(s.Values))
for i, v := range s.Values {
t[i] = v.Int32()
}
dst.InsertStacktrace(s.Row, t)
}
return it.Err()
}
func grow[T any](s []T, n int) []T {
if cap(s) < n {
return make([]T, n, 2*n)
}
return s[:n]
}
type symbolsResolverV2 struct {
symbols *symdb.Reader
bucket phlareobj.Bucket
*inMemoryParquetTables
}
func newSymbolsResolverV2(ctx context.Context, b phlareobj.Bucket, meta *block.Meta) (*symbolsResolverV2, error) {
r := symbolsResolverV2{bucket: b}
var err error
if r.symbols, err = symdb.Open(ctx, b, meta); err != nil {
return nil, err
}
r.inMemoryParquetTables, err = openInMemoryParquetTables(ctx, b, meta)
return &r, err
}
func (r *symbolsResolverV2) Load(ctx context.Context) error {
return r.symbols.Load(ctx)
}
func (r *symbolsResolverV2) Close() error {
err := multierror.New()
if r.symbols != nil {
err.Add(r.symbols.Close())
}
if r.inMemoryParquetTables != nil {
err.Add(r.inMemoryParquetTables.Close())
}
return err.Err()
}
func (r *symbolsResolverV2) Partition(ctx context.Context, partition uint64) (symdb.PartitionReader, error) {
sr, err := r.symbols.Partition(ctx, partition)
if err != nil {
return nil, err
}
var t symdb.PartitionStats
sr.WriteStats(&t)
s := sr.Symbols()
p := symbolsPartition{
stats: symdb.PartitionStats{
StacktracesTotal: t.StacktracesTotal,
MaxStacktraceID: t.MaxStacktraceID,
LocationsTotal: len(s.Locations),
MappingsTotal: len(s.Mappings),
FunctionsTotal: len(s.Functions),
StringsTotal: len(s.Strings),
},
symbols: &symdb.Symbols{
Stacktraces: s.Stacktraces,
Locations: r.locations.cache,
Mappings: r.mappings.cache,
Functions: r.functions.cache,
Strings: r.strings.cache,
},
release: sr.Release,
}
return &p, nil
}
type symbolsPartition struct {
stats symdb.PartitionStats
symbols *symdb.Symbols
release func()
}
func (p *symbolsPartition) Symbols() *symdb.Symbols { return p.symbols }
func (p *symbolsPartition) WriteStats(stats *symdb.PartitionStats) { *stats = p.stats }
func (p *symbolsPartition) Release() {
if p.release != nil {
p.release()
}
}
type inMemoryParquetTables struct {
strings inMemoryparquetReader[string, *schemav1.StringPersister]
functions inMemoryparquetReader[*schemav1.InMemoryFunction, *schemav1.FunctionPersister]
locations inMemoryparquetReader[*schemav1.InMemoryLocation, *schemav1.LocationPersister]
mappings inMemoryparquetReader[*schemav1.InMemoryMapping, *schemav1.MappingPersister]
}
func openInMemoryParquetTables(ctx context.Context, r phlareobj.BucketReader, meta *block.Meta) (*inMemoryParquetTables, error) {
var t inMemoryParquetTables
for _, f := range meta.Files {
switch f.RelPath {
case t.locations.relPath():
t.locations.meta = f
case t.functions.relPath():
t.functions.meta = f
case t.mappings.relPath():
t.mappings.meta = f
case t.strings.relPath():
t.strings.meta = f
}
}
g, ctx := errgroup.WithContext(ctx)
g.Go(func() error { return t.locations.open(ctx, r) })
g.Go(func() error { return t.mappings.open(ctx, r) })
g.Go(func() error { return t.functions.open(ctx, r) })
g.Go(func() error { return t.strings.open(ctx, r) })
return &t, g.Wait()
}
func (t *inMemoryParquetTables) Close() error {
return multierror.New(
t.strings.Close(),
t.functions.Close(),
t.locations.Close(),
t.mappings.Close()).
Err()
}
type ResultWithRowNum[M any] struct {
Result M
RowNum int64
}
type inMemoryparquetReader[M schemav1.Models, P schemav1.Persister[M]] struct {
persister P
meta block.File
cache []M
}
func (r *inMemoryparquetReader[M, P]) open(ctx context.Context, bucketReader phlareobj.BucketReader) error {
var file parquetobj.File
if err := file.Open(
ctx,
bucketReader,
r.meta,
parquet.SkipBloomFilters(true), // we don't use bloom filters
parquet.FileReadMode(parquet.ReadModeAsync),
parquet.ReadBufferSize(parquetReadBufferSize),
); err != nil {
return err
}
// read all rows into memory
r.cache = make([]M, file.NumRows())
var offset int64
for _, rg := range file.RowGroups() {
rows := rg.NumRows()
dst := r.cache[offset : offset+rows]
offset += rows
if err := r.readRG(dst, rg); err != nil {
return fmt.Errorf("reading row group from parquet file '%s': %w", file.Path(), err)
}
}
return file.Close()
}
// parquet.CopyRows uses hardcoded buffer size:
// defaultRowBufferSize = 42
const inMemoryReaderRowsBufSize = 1 << 10
func (r *inMemoryparquetReader[M, P]) readRG(dst []M, rg parquet.RowGroup) (err error) {
rr := parquet.NewRowGroupReader(rg)
defer runutil.CloseWithLogOnErr(util.Logger, rr, "closing parquet row group reader")
buf := make([]parquet.Row, inMemoryReaderRowsBufSize)
for i := 0; i < len(dst); {
n, err := rr.ReadRows(buf)
if n > 0 {
for _, row := range buf[:n] {
_, v, err := r.persister.Reconstruct(row)
if err != nil {
return err
}
dst[i] = v
i++
}
}
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
}
return nil
}
func (r *inMemoryparquetReader[M, P]) Close() error {
r.cache = nil
return nil
}
func (r *inMemoryparquetReader[M, P]) relPath() string {
return r.persister.Name() + block.ParquetSuffix
}