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store/bucket: use roaring bitmaps for postings list
TODO: description/tests/convert set operations into bitwise ops Signed-off-by: Giedrius Statkevičius <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| // Copyright (c) The Thanos Authors. | ||
| // Licensed under the Apache License 2.0. | ||
|
|
||
| package store | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/RoaringBitmap/roaring" | ||
| "github.com/pkg/errors" | ||
| "github.com/prometheus/prometheus/storage" | ||
| "github.com/prometheus/prometheus/tsdb/index" | ||
| ) | ||
|
|
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| type indexBitmapPostings interface { | ||
| index.Postings | ||
| GetBitmap() *roaring.Bitmap | ||
| } | ||
|
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| type bitmapPostingsReader struct { | ||
| r io.Reader | ||
| postings []postingPtr | ||
|
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| lastOffset int64 | ||
| pi int | ||
| err error | ||
|
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| start, length int64 | ||
|
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| cur *bitmapPostings | ||
| readBuf []byte | ||
|
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| repeatFor int | ||
| } | ||
|
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| type bitmapPostings struct { | ||
| cur storage.SeriesRef | ||
| bmap *roaring.Bitmap | ||
| bmapIterator roaring.IntIterable | ||
| } | ||
|
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| func newBitmapPostingsReader(r io.Reader, postings []postingPtr, start, length int64) *bitmapPostingsReader { | ||
| return &bitmapPostingsReader{ | ||
| r: r, | ||
| postings: postings, | ||
| start: start, | ||
| length: length, | ||
| readBuf: make([]byte, 4), | ||
| } | ||
| } | ||
|
|
||
| func getInt32(r io.Reader, buf []byte) (uint32, error) { | ||
| read, err := r.Read(buf) | ||
| if err != nil { | ||
| return 0, errors.Wrap(err, "reading") | ||
| } | ||
| if read != 4 { | ||
| return 0, fmt.Errorf("read got %d bytes instead of 4", read) | ||
| } | ||
| return binary.BigEndian.Uint32(buf), nil | ||
| } | ||
|
|
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| func (r *bitmapPostingsReader) Err() error { | ||
| if errors.Is(r.err, io.EOF) { | ||
| return nil | ||
| } | ||
| return r.err | ||
| } | ||
|
|
||
| func (r *bitmapPostings) GetBitmap() *roaring.Bitmap { | ||
| return r.bmap | ||
| } | ||
|
|
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| type errBitmapPostings struct { | ||
| e error | ||
| } | ||
|
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| func (e errBitmapPostings) Next() bool { return false } | ||
| func (e errBitmapPostings) Seek(storage.SeriesRef) bool { return false } | ||
| func (e errBitmapPostings) At() storage.SeriesRef { return 0 } | ||
| func (e errBitmapPostings) Err() error { return e.e } | ||
| func (e errBitmapPostings) GetBitmap() *roaring.Bitmap { return nil } | ||
|
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| func (r *bitmapPostingsReader) Next() bool { | ||
| if r.repeatFor > 0 { | ||
| r.repeatFor-- | ||
| return true | ||
| } | ||
| if r.pi >= len(r.postings) { | ||
| return false | ||
| } | ||
| if r.Err() != nil { | ||
| return false | ||
| } | ||
| from := r.postings[r.pi].ptr.Start - r.start | ||
|
|
||
| if from-r.lastOffset < 0 { | ||
| panic("would have skipped negative bytes") | ||
| } | ||
|
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| _, err := io.CopyN(io.Discard, r.r, from-r.lastOffset) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| r.lastOffset += from - r.lastOffset | ||
|
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| bmap := roaring.NewBitmap() | ||
|
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| postingsCount, err := getInt32(r.r, r.readBuf[:]) | ||
| if err != nil { | ||
| r.err = err | ||
| return false | ||
| } | ||
| r.lastOffset += 4 | ||
|
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| for i := 0; i < int(postingsCount); i++ { | ||
| posting, err := getInt32(r.r, r.readBuf[:]) | ||
| if err != nil { | ||
| r.err = err | ||
| return false | ||
| } | ||
| r.lastOffset += 4 | ||
|
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| bmap.Add(posting) | ||
| } | ||
| r.cur = &bitmapPostings{ | ||
| bmap: bmap, | ||
| } | ||
| r.pi++ | ||
|
|
||
| for { | ||
| if r.pi >= len(r.postings) { | ||
| break | ||
| } | ||
|
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| if r.postings[r.pi].ptr.Start == r.postings[r.pi-1].ptr.Start && | ||
| r.postings[r.pi].ptr.End == r.postings[r.pi-1].ptr.End { | ||
| r.repeatFor++ | ||
| r.pi++ | ||
| continue | ||
| } | ||
|
|
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| break | ||
| } | ||
|
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| return true | ||
| } | ||
|
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| func (r *bitmapPostingsReader) At() *bitmapPostings { | ||
| r.cur.bmapIterator = r.cur.bmap.Iterator() | ||
| return r.cur | ||
| } | ||
|
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| func (bp *bitmapPostings) Next() bool { | ||
| ret := bp.bmapIterator.HasNext() | ||
| if ret == true { | ||
| bp.cur = storage.SeriesRef(bp.bmapIterator.Next()) | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
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| func (bp *bitmapPostings) Seek(v storage.SeriesRef) bool { | ||
| if bp.At() >= v { | ||
| return true | ||
| } | ||
|
|
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| for bp.Next() { | ||
| if bp.At() >= v { | ||
| return true | ||
| } | ||
| } | ||
|
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| return false | ||
| } | ||
|
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| func (bp *bitmapPostings) At() storage.SeriesRef { | ||
| return bp.cur | ||
| } | ||
|
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| func (bp *bitmapPostings) Err() error { | ||
| return nil | ||
| } |
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