vendor: update prometheus/tsdb

vendor/github.com/prometheus/tsdb/block.go

@@ -133,7 +133,7 @@ func writeMetaFile(dir string, meta *BlockMeta) error {
 	return renameFile(tmp, path)
 }
 
-// Block represents a directory of time series data covering a continous time range.
+// Block represents a directory of time series data covering a continuous time range.
 type Block struct {
 	mtx            sync.RWMutex
 	closing        bool
@@ -142,10 +142,9 @@ type Block struct {
 	dir  string
 	meta BlockMeta
 
-	chunkr *chunkReader
-	indexr *indexReader
-
-	tombstones tombstoneReader
+	chunkr     ChunkReader
+	indexr     IndexReader
+	tombstones TombstoneReader
 }
 
 // OpenBlock opens the block in the directory. It can be passed a chunk pool, which is used
@@ -156,11 +155,11 @@ func OpenBlock(dir string, pool chunks.Pool) (*Block, error) {
 		return nil, err
 	}
 
-	cr, err := newChunkReader(chunkDir(dir), pool)
+	cr, err := NewDirChunkReader(chunkDir(dir), pool)
 	if err != nil {
 		return nil, err
 	}
-	ir, err := newIndexReader(dir)
+	ir, err := NewFileIndexReader(filepath.Join(dir, "index"))
 	if err != nil {
 		return nil, err
 	}
@@ -284,13 +283,15 @@ func (pb *Block) Delete(mint, maxt int64, ms ...labels.Matcher) error {
 		return ErrClosing
 	}
 
-	pr := newPostingsReader(pb.indexr)
-	p, absent := pr.Select(ms...)
+	p, absent, err := PostingsForMatchers(pb.indexr, ms...)
+	if err != nil {
+		return errors.Wrap(err, "select series")
+	}
 
 	ir := pb.indexr
 
 	// Choose only valid postings which have chunks in the time-range.
-	stones := map[uint64]Intervals{}
+	stones := memTombstones{}
 
 	var lset labels.Labels
 	var chks []ChunkMeta
@@ -322,16 +323,21 @@ Outer:
 		return p.Err()
 	}
 
-	// Merge the current and new tombstones.
-	for k, v := range stones {
-		pb.tombstones.add(k, v[0])
+	err = pb.tombstones.Iter(func(id uint64, ivs Intervals) error {
+		for _, iv := range ivs {
+			stones.add(id, iv)
+			pb.meta.Stats.NumTombstones++
+		}
+		return nil
+	})
+	if err != nil {
+		return err
 	}
+	pb.tombstones = stones
 
 	if err := writeTombstoneFile(pb.dir, pb.tombstones); err != nil {
 		return err
 	}
-
-	pb.meta.Stats.NumTombstones = uint64(len(pb.tombstones))
 	return writeMetaFile(pb.dir, &pb.meta)
 }
 

vendor/github.com/prometheus/tsdb/block.prof

+--- contention:
+cycles/second=2494255279
+80179315716 1 @ 0x10061bb 0x10e008c 0x10e3934 0x10dfd30 0x10e1468 0x10e0431 0x1328cdb 0x102e9fd 0x105cea1
+80176248000 1 @ 0x1065c12 0x1313b9d 0x10dfd30 0x105cea1
+37792267436 303368 @ 0x10061fb 0x131dc08 0x105cea1
+21607828 1098 @ 0x10648fe 0x10650d7 0x1064fca 0x12e5a74 0x12e5df2 0x131d969 0x105cea1
+1272473 118 @ 0x10648fe 0x1065232 0x10651c6 0x1064cb0 0x12e5bcc 0x131dc50 0x105cea1
+851800 1 @ 0x10061bb 0x1313bc6 0x10dfd30 0x105cea1
+818628 59 @ 0x10648fe 0x1065232 0x10651c6 0x1064ebf 0x12e5a74 0x12e5df2 0x131d969 0x105cea1
+501203 2 @ 0x1005473 0x12e5ed4 0x131d969 0x105cea1
+7738 1 @ 0x10648fe 0x1064d19 0x12e5bcc 0x131dc50 0x105cea1
+3846 1 @ 0x1005473 0x10e373b 0x10dfd3a 0x10e1468 0x10e0431 0x1328cdb 0x102e9fd 0x105cea1

vendor/github.com/prometheus/tsdb/chunks.go

@@ -298,7 +298,7 @@ type ChunkReader interface {
 // of series data.
 type chunkReader struct {
 	// The underlying bytes holding the encoded series data.
-	bs [][]byte
+	bs []ByteSlice
 
 	// Closers for resources behind the byte slices.
 	cs []io.Closer
@@ -306,8 +306,32 @@ type chunkReader struct {
 	pool chunks.Pool
 }
 
-// newChunkReader returns a new chunkReader based on mmaped files found in dir.
-func newChunkReader(dir string, pool chunks.Pool) (*chunkReader, error) {
+func newChunkReader(bs []ByteSlice, cs []io.Closer, pool chunks.Pool) (*chunkReader, error) {
+	cr := chunkReader{pool: pool, bs: bs, cs: cs}
+
+	for i, b := range cr.bs {
+		if b.Len() < 4 {
+			return nil, errors.Wrapf(errInvalidSize, "validate magic in segment %d", i)
+		}
+		// Verify magic number.
+		if m := binary.BigEndian.Uint32(b.Range(0, 4)); m != MagicChunks {
+			return nil, fmt.Errorf("invalid magic number %x", m)
+		}
+	}
+	return &cr, nil
+}
+
+// NewChunkReader returns a new chunk reader against the given byte slices.
+func NewChunkReader(bs []ByteSlice, pool chunks.Pool) (ChunkReader, error) {
+	if pool == nil {
+		pool = chunks.NewPool()
+	}
+	return newChunkReader(bs, nil, pool)
+}
+
+// NewDirChunkReader returns a new ChunkReader against sequentially numbered files in the
+// given directory.
+func NewDirChunkReader(dir string, pool chunks.Pool) (ChunkReader, error) {
 	files, err := sequenceFiles(dir)
 	if err != nil {
 		return nil, err
@@ -315,27 +339,19 @@ func newChunkReader(dir string, pool chunks.Pool) (*chunkReader, error) {
 	if pool == nil {
 		pool = chunks.NewPool()
 	}
-	cr := chunkReader{pool: pool}
+
+	var bs []ByteSlice
+	var cs []io.Closer
 
 	for _, fn := range files {
 		f, err := openMmapFile(fn)
 		if err != nil {
 			return nil, errors.Wrapf(err, "mmap files")
 		}
-		cr.cs = append(cr.cs, f)
-		cr.bs = append(cr.bs, f.b)
+		cs = append(cs, f)
+		bs = append(bs, realByteSlice(f.b))
 	}
-
-	for i, b := range cr.bs {
-		if len(b) < 4 {
-			return nil, errors.Wrapf(errInvalidSize, "validate magic in segment %d", i)
-		}
-		// Verify magic number.
-		if m := binary.BigEndian.Uint32(b[:4]); m != MagicChunks {
-			return nil, fmt.Errorf("invalid magic number %x", m)
-		}
-	}
-	return &cr, nil
+	return newChunkReader(bs, cs, pool)
 }
 
 func (s *chunkReader) Close() error {
@@ -352,16 +368,18 @@ func (s *chunkReader) Chunk(ref uint64) (chunks.Chunk, error) {
 	}
 	b := s.bs[seq]
 
-	if int(off) >= len(b) {
-		return nil, errors.Errorf("offset %d beyond data size %d", off, len(b))
+	if int(off) >= b.Len() {
+		return nil, errors.Errorf("offset %d beyond data size %d", off, b.Len())
 	}
-	b = b[off:]
+	// With the minimum chunk length this should never cause us reading
+	// over the end of the slice.
+	r := b.Range(off, off+binary.MaxVarintLen32)
 
-	l, n := binary.Uvarint(b)
+	l, n := binary.Uvarint(r)
 	if n < 0 {
 		return nil, fmt.Errorf("reading chunk length failed")
 	}
-	b = b[n:]
+	r = b.Range(off+n, off+n+int(l))
 
-	return s.pool.Get(chunks.Encoding(b[0]), b[1:1+l])
+	return s.pool.Get(chunks.Encoding(r[0]), r[1:1+l])
 }

vendor/github.com/prometheus/tsdb/chunks/xor.go

@@ -46,8 +46,7 @@ package chunks
 import (
 	"encoding/binary"
 	"math"
-
-	bits "github.com/dgryski/go-bits"
+	"math/bits"
 )
 
 // XORChunk holds XOR encoded sample data.
@@ -197,8 +196,8 @@ func (a *xorAppender) writeVDelta(v float64) {
 	}
 	a.b.writeBit(one)
 
-	leading := uint8(bits.Clz(vDelta))
-	trailing := uint8(bits.Ctz(vDelta))
+	leading := uint8(bits.LeadingZeros64(vDelta))
+	trailing := uint8(bits.TrailingZeros64(vDelta))
 
 	// Clamp number of leading zeros to avoid overflow when encoding.
 	if leading >= 32 {

vendor/github.com/prometheus/tsdb/compact.go

@@ -52,7 +52,7 @@ type Compactor interface {
 	Plan(dir string) ([]string, error)
 
 	// Write persists a Block into a directory.
-	Write(dest string, b BlockReader, mint, maxt int64) error
+	Write(dest string, b BlockReader, mint, maxt int64) (ulid.ULID, error)
 
 	// Compact runs compaction against the provided directories. Must
 	// only be called concurrently with results of Plan().
@@ -321,7 +321,7 @@ func (c *LeveledCompactor) Compact(dest string, dirs ...string) (err error) {
 	return c.write(dest, compactBlockMetas(uid, metas...), blocks...)
 }
 
-func (c *LeveledCompactor) Write(dest string, b BlockReader, mint, maxt int64) error {
+func (c *LeveledCompactor) Write(dest string, b BlockReader, mint, maxt int64) (ulid.ULID, error) {
 	entropy := rand.New(rand.NewSource(time.Now().UnixNano()))
 	uid := ulid.MustNew(ulid.Now(), entropy)
 
@@ -333,7 +333,7 @@ func (c *LeveledCompactor) Write(dest string, b BlockReader, mint, maxt int64) e
 	meta.Compaction.Level = 1
 	meta.Compaction.Sources = []ulid.ULID{uid}
 
-	return c.write(dest, meta, b)
+	return uid, c.write(dest, meta, b)
 }
 
 // instrumentedChunkWriter is used for level 1 compactions to record statistics
@@ -418,7 +418,7 @@ func (c *LeveledCompactor) write(dest string, meta *BlockMeta, blocks ...BlockRe
 	}
 
 	// Create an empty tombstones file.
-	if err := writeTombstoneFile(tmp, newEmptyTombstoneReader()); err != nil {
+	if err := writeTombstoneFile(tmp, EmptyTombstoneReader()); err != nil {
 		return errors.Wrap(err, "write new tombstones file")
 	}
 
@@ -453,7 +453,7 @@ func (c *LeveledCompactor) write(dest string, meta *BlockMeta, blocks ...BlockRe
 // of the provided blocks. It returns meta information for the new block.
 func (c *LeveledCompactor) populateBlock(blocks []BlockReader, meta *BlockMeta, indexw IndexWriter, chunkw ChunkWriter) error {
 	var (
-		set        compactionSet
+		set        ChunkSeriesSet
 		allSymbols = make(map[string]struct{}, 1<<16)
 		closers    = []io.Closer{}
 	)
@@ -597,18 +597,11 @@ func (c *LeveledCompactor) populateBlock(blocks []BlockReader, meta *BlockMeta,
 	return nil
 }
 
-type compactionSet interface {
-	Next() bool
-	At() (labels.Labels, []ChunkMeta, Intervals)
-	Err() error
-}
-
 type compactionSeriesSet struct {
 	p          Postings
 	index      IndexReader
 	chunks     ChunkReader
 	tombstones TombstoneReader
-	series     SeriesSet
 
 	l         labels.Labels
 	c         []ChunkMeta
@@ -631,7 +624,11 @@ func (c *compactionSeriesSet) Next() bool {
 	}
 	var err error
 
-	c.intervals = c.tombstones.Get(c.p.At())
+	c.intervals, err = c.tombstones.Get(c.p.At())
+	if err != nil {
+		c.err = errors.Wrap(err, "get tombstones")
+		return false
+	}
 
 	if err = c.index.Series(c.p.At(), &c.l, &c.c); err != nil {
 		c.err = errors.Wrapf(err, "get series %d", c.p.At())
@@ -675,7 +672,7 @@ func (c *compactionSeriesSet) At() (labels.Labels, []ChunkMeta, Intervals) {
 }
 
 type compactionMerger struct {
-	a, b compactionSet
+	a, b ChunkSeriesSet
 
 	aok, bok  bool
 	l         labels.Labels
@@ -688,7 +685,7 @@ type compactionSeries struct {
 	chunks []*ChunkMeta
 }
 
-func newCompactionMerger(a, b compactionSet) (*compactionMerger, error) {
+func newCompactionMerger(a, b ChunkSeriesSet) (*compactionMerger, error) {
 	c := &compactionMerger{
 		a: a,
 		b: b,

vendor/github.com/prometheus/tsdb/db.go

@@ -52,7 +52,7 @@ var DefaultOptions = &Options{
 
 // Options of the DB storage.
 type Options struct {
-	// The interval at which the write ahead log is flushed to disc.
+	// The interval at which the write ahead log is flushed to disk.
 	WALFlushInterval time.Duration
 
 	// Duration of persisted data to keep.
@@ -101,7 +101,6 @@ type DB struct {
 	opts      *Options
 	chunkPool chunks.Pool
 	compactor Compactor
-	wal       WAL
 
 	// Mutex for that must be held when modifying the general block layout.
 	mtx    sync.RWMutex
@@ -142,7 +141,7 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
 	})
 	m.reloadsFailed = prometheus.NewCounter(prometheus.CounterOpts{
 		Name: "prometheus_tsdb_reloads_failures_total",
-		Help: "Number of times the database failed to reload black data from disk.",
+		Help: "Number of times the database failed to reload block data from disk.",
 	})
 	m.compactionsTriggered = prometheus.NewCounter(prometheus.CounterOpts{
 		Name: "prometheus_tsdb_compactions_triggered_total",
@@ -278,16 +277,23 @@ func (db *DB) retentionCutoff() (bool, error) {
 	}
 
 	db.mtx.RLock()
-	defer db.mtx.RUnlock()
+	blocks := db.blocks[:]
+	db.mtx.RUnlock()
 
-	if len(db.blocks) == 0 {
+	if len(blocks) == 0 {
 		return false, nil
 	}
 
-	last := db.blocks[len(db.blocks)-1]
+	last := blocks[len(db.blocks)-1]
+
 	mint := last.Meta().MaxTime - int64(db.opts.RetentionDuration)
+	dirs, err := retentionCutoffDirs(db.dir, mint)
+	if err != nil {
+		return false, err
+	}
 
-	return retentionCutoff(db.dir, mint)
+	// This will close the dirs and then delete the dirs.
+	return len(dirs) > 0, db.reload(dirs...)
 }
 
 // Appender opens a new appender against the database.
@@ -345,7 +351,7 @@ func (db *DB) compact() (changes bool, err error) {
 			mint: mint,
 			maxt: maxt,
 		}
-		if err = db.compactor.Write(db.dir, head, mint, maxt); err != nil {
+		if _, err = db.compactor.Write(db.dir, head, mint, maxt); err != nil {
 			return changes, errors.Wrap(err, "persist head block")
 		}
 		changes = true
@@ -389,40 +395,37 @@ func (db *DB) compact() (changes bool, err error) {
 	return changes, nil
 }
 
-// retentionCutoff deletes all directories of blocks in dir that are strictly
+// retentionCutoffDirs returns all directories of blocks in dir that are strictly
 // before mint.
-func retentionCutoff(dir string, mint int64) (bool, error) {
+func retentionCutoffDirs(dir string, mint int64) ([]string, error) {
 	df, err := fileutil.OpenDir(dir)
 	if err != nil {
-		return false, errors.Wrapf(err, "open directory")
+		return nil, errors.Wrapf(err, "open directory")
 	}
 	defer df.Close()
 
 	dirs, err := blockDirs(dir)
 	if err != nil {
-		return false, errors.Wrapf(err, "list block dirs %s", dir)
+		return nil, errors.Wrapf(err, "list block dirs %s", dir)
 	}
 
-	changes := false
+	delDirs := []string{}
 
 	for _, dir := range dirs {
 		meta, err := readMetaFile(dir)
 		if err != nil {
-			return changes, errors.Wrapf(err, "read block meta %s", dir)
+			return nil, errors.Wrapf(err, "read block meta %s", dir)
 		}
 		// The first block we encounter marks that we crossed the boundary
 		// of deletable blocks.
 		if meta.MaxTime >= mint {
 			break
 		}
-		changes = true
 
-		if err := os.RemoveAll(dir); err != nil {
-			return changes, err
-		}
+		delDirs = append(delDirs, dir)
 	}
 
-	return changes, fileutil.Fsync(df)
+	return delDirs, nil
 }
 
 func (db *DB) getBlock(id ulid.ULID) (*Block, bool) {
@@ -572,6 +575,7 @@ func (db *DB) Close() error {
 	if db.lockf != nil {
 		merr.Add(db.lockf.Unlock())
 	}
+	merr.Add(db.head.Close())
 	return merr.Err()
 }
 
@@ -615,7 +619,8 @@ func (db *DB) Snapshot(dir string) error {
 			return errors.Wrap(err, "error snapshotting headblock")
 		}
 	}
-	return db.compactor.Write(dir, db.head, db.head.MinTime(), db.head.MaxTime())
+	_, err := db.compactor.Write(dir, db.head, db.head.MinTime(), db.head.MaxTime())
+	return errors.Wrap(err, "snapshot head block")
 }
 
 // Querier returns a new querier over the data partition for the given time range.

vendor/github.com/prometheus/tsdb/db_unix.go

@@ -11,19 +11,20 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !windows,!plan9,!solaris
+// +build !windows,!plan9
 
 package tsdb
 
 import (
 	"os"
-	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 func mmap(f *os.File, length int) ([]byte, error) {
-	return syscall.Mmap(int(f.Fd()), 0, length, syscall.PROT_READ, syscall.MAP_SHARED)
+	return unix.Mmap(int(f.Fd()), 0, length, unix.PROT_READ, unix.MAP_SHARED)
 }
 
 func munmap(b []byte) (err error) {
-	return syscall.Munmap(b)
+	return unix.Munmap(b)
 }

vendor/github.com/prometheus/tsdb/encoding_helpers.go

@@ -3,6 +3,7 @@ package tsdb
 import (
 	"encoding/binary"
 	"hash"
+	"hash/crc32"
 	"unsafe"
 )
 
@@ -77,6 +78,11 @@ func (d *decbuf) uvarint32() uint32 { return uint32(d.uvarint64()) }
 func (d *decbuf) be32int() int      { return int(d.be32()) }
 func (d *decbuf) be64int64() int64  { return int64(d.be64()) }
 
+// crc32 returns a CRC32 checksum over the remaining bytes.
+func (d *decbuf) crc32() uint32 {
+	return crc32.Checksum(d.b, castagnoliTable)
+}
+
 func (d *decbuf) uvarintStr() string {
 	l := d.uvarint64()
 	if d.e != nil {

vendor/github.com/prometheus/tsdb/head.go

@@ -66,7 +66,7 @@ type Head struct {
 
 	postings *memPostings // postings lists for terms
 
-	tombstones tombstoneReader
+	tombstones memTombstones
 }
 
 type headMetrics struct {
@@ -186,7 +186,7 @@ func NewHead(r prometheus.Registerer, l log.Logger, wal WAL, chunkRange int64) (
 		values:     map[string]stringset{},
 		symbols:    map[string]struct{}{},
 		postings:   newUnorderedMemPostings(),
-		tombstones: newEmptyTombstoneReader(),
+		tombstones: memTombstones{},
 	}
 	h.metrics = newHeadMetrics(h, r)
 
@@ -574,8 +574,10 @@ func (h *Head) Delete(mint, maxt int64, ms ...labels.Matcher) error {
 
 	ir := h.indexRange(mint, maxt)
 
-	pr := newPostingsReader(ir)
-	p, absent := pr.Select(ms...)
+	p, absent, err := PostingsForMatchers(ir, ms...)
+	if err != nil {
+		return errors.Wrap(err, "select series")
+	}
 
 	var stones []Stone
 
@@ -739,6 +741,11 @@ func (h *Head) MaxTime() int64 {
 	return atomic.LoadInt64(&h.maxTime)
 }
 
+// Close flushes the WAL and closes the head.
+func (h *Head) Close() error {
+	return h.wal.Close()
+}
+
 type headChunkReader struct {
 	head       *Head
 	mint, maxt int64

vendor/github.com/prometheus/tsdb/index.go

@@ -560,7 +560,7 @@ type StringTuples interface {
 
 type indexReader struct {
 	// The underlying byte slice holding the encoded series data.
-	b   []byte
+	b   ByteSlice
 	toc indexTOC
 
 	// Close that releases the underlying resources of the byte slice.
@@ -575,33 +575,62 @@ type indexReader struct {
 	// prevents memory faults when applications work with read symbols after
 	// the block has been unmapped.
 	symbols map[uint32]string
+
+	crc32 hash.Hash32
 }
 
 var (
-	errInvalidSize = fmt.Errorf("invalid size")
-	errInvalidFlag = fmt.Errorf("invalid flag")
+	errInvalidSize     = fmt.Errorf("invalid size")
+	errInvalidFlag     = fmt.Errorf("invalid flag")
+	errInvalidChecksum = fmt.Errorf("invalid checksum")
 )
 
-// NewIndexReader returns a new IndexReader on the given directory.
-func NewIndexReader(dir string) (IndexReader, error) { return newIndexReader(dir) }
+// ByteSlice abstracts a byte slice.
+type ByteSlice interface {
+	Len() int
+	Range(start, end int) []byte
+}
+
+type realByteSlice []byte
+
+func (b realByteSlice) Len() int {
+	return len(b)
+}
+
+func (b realByteSlice) Range(start, end int) []byte {
+	return b[start:end]
+}
+
+func (b realByteSlice) Sub(start, end int) ByteSlice {
+	return b[start:end]
+}
+
+// NewIndexReader returns a new IndexReader on the given byte slice.
+func NewIndexReader(b ByteSlice) (IndexReader, error) {
+	return newIndexReader(b, nil)
+}
 
-// newIndexReader returns a new indexReader on the given directory.
-func newIndexReader(dir string) (*indexReader, error) {
-	f, err := openMmapFile(filepath.Join(dir, "index"))
+// NewFileIndexReader returns a new index reader against the given index file.
+func NewFileIndexReader(path string) (IndexReader, error) {
+	f, err := openMmapFile(path)
 	if err != nil {
 		return nil, err
 	}
+	return newIndexReader(realByteSlice(f.b), f)
+}
+
+func newIndexReader(b ByteSlice, c io.Closer) (*indexReader, error) {
 	r := &indexReader{
-		b:       f.b,
-		c:       f,
+		b:       b,
+		c:       c,
 		symbols: map[uint32]string{},
+		crc32:   newCRC32(),
 	}
-
 	// Verify magic number.
-	if len(f.b) < 4 {