vendor: update tsdb

vendor/github.com/prometheus/tsdb/LICENSE

@@ -0,0 +1,201 @@
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+
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+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/prometheus/tsdb/README.md

@@ -0,0 +1,5 @@
+# TSDB
+
+This repository contains the new Prometheus storage layer that will be used in its 2.0 release.
+
+A writeup of its design can be found [here](https://fabxc.org/blog/2017-04-10-writing-a-tsdb/).

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (
@@ -6,7 +19,6 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"sort"
 
 	"github.com/oklog/ulid"
 	"github.com/pkg/errors"
@@ -23,7 +35,7 @@ type DiskBlock interface {
 	// Index returns an IndexReader over the block's data.
 	Index() IndexReader
 
-	// Series returns a SeriesReader over the block's data.
+	// Chunks returns a ChunkReader over the block's data.
 	Chunks() ChunkReader
 
 	// Close releases all underlying resources of the block.
@@ -125,8 +137,10 @@ func writeMetaFile(dir string, meta *BlockMeta) error {
 	enc := json.NewEncoder(f)
 	enc.SetIndent("", "\t")
 
-	if err := enc.Encode(&blockMeta{Version: 1, BlockMeta: meta}); err != nil {
+	var merr MultiError
-		return err
+	if merr.Add(enc.Encode(&blockMeta{Version: 1, BlockMeta: meta})); merr.Err() != nil {
+		merr.Add(f.Close())
+		return merr
 	}
 	if err := f.Close(); err != nil {
 		return err
@@ -228,30 +242,3 @@ func (f *mmapFile) Close() error {
 	}
 	return err1
 }
-
-// A skiplist maps offsets to values. The values found in the data at an
-// offset are strictly greater than the indexed value.
-type skiplist interface {
-	// offset returns the offset to data containing values of x and lower.
-	offset(x int64) (uint32, bool)
-}
-
-// simpleSkiplist is a slice of plain value/offset pairs.
-type simpleSkiplist []skiplistPair
-
-type skiplistPair struct {
-	value  int64
-	offset uint32
-}
-
-func (sl simpleSkiplist) offset(x int64) (uint32, bool) {
-	// Search for the first offset that contains data greater than x.
-	i := sort.Search(len(sl), func(i int) bool { return sl[i].value >= x })
-
-	// If no element was found return false. If the first element is found,
-	// there's no previous offset actually containing values that are x or lower.
-	if i == len(sl) || i == 0 {
-		return 0, false
-	}
-	return sl[i-1].offset, true
-}

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (
@@ -15,7 +28,7 @@ import (
 )
 
 const (
-	// MagicChunks is 4 bytes at the head of series file.
+	// MagicChunks is 4 bytes at the head of a series file.
 	MagicChunks = 0x85BD40DD
 )
 
@@ -30,12 +43,23 @@ type ChunkMeta struct {
 	MinTime, MaxTime int64 // time range the data covers
 }
 
+// writeHash writes the chunk encoding and raw data into the provided hash.
+func (cm *ChunkMeta) writeHash(h hash.Hash) error {
+	if _, err := h.Write([]byte{byte(cm.Chunk.Encoding())}); err != nil {
+		return err
+	}
+	if _, err := h.Write(cm.Chunk.Bytes()); err != nil {
+		return err
+	}
+	return nil
+}
+
 // ChunkWriter serializes a time block of chunked series data.
 type ChunkWriter interface {
-	// WriteChunks writes several chunks. The data field of the ChunkMetas
+	// WriteChunks writes several chunks. The Chunk field of the ChunkMetas
 	// must be populated.
 	// After returning successfully, the Ref fields in the ChunkMetas
-	// is set and can be used to retrieve the chunks from the written data.
+	// are set and can be used to retrieve the chunks from the written data.
 	WriteChunks(chunks ...*ChunkMeta) error
 
 	// Close writes any required finalization and closes the resources
@@ -112,7 +136,9 @@ func (w *chunkWriter) finalizeTail() error {
 
 func (w *chunkWriter) cut() error {
 	// Sync current tail to disk and close.
-	w.finalizeTail()
+	if err := w.finalizeTail(); err != nil {
+		return err
+	}
 
 	p, _, err := nextSequenceFile(w.dirFile.Name(), "")
 	if err != nil {
@@ -150,8 +176,8 @@ func (w *chunkWriter) cut() error {
 	return nil
 }
 
-func (w *chunkWriter) write(wr io.Writer, b []byte) error {
+func (w *chunkWriter) write(b []byte) error {
-	n, err := wr.Write(b)
+	n, err := w.wbuf.Write(b)
 	w.n += int64(n)
 	return err
 }
@@ -159,9 +185,9 @@ func (w *chunkWriter) write(wr io.Writer, b []byte) error {
 func (w *chunkWriter) WriteChunks(chks ...*ChunkMeta) error {
 	// Calculate maximum space we need and cut a new segment in case
 	// we don't fit into the current one.
-	maxLen := int64(binary.MaxVarintLen32)
+	maxLen := int64(binary.MaxVarintLen32) // The number of chunks.
 	for _, c := range chks {
-		maxLen += binary.MaxVarintLen32 + 1
+		maxLen += binary.MaxVarintLen32 + 1 // The number of bytes in the chunk and its encoding.
 		maxLen += int64(len(c.Chunk.Bytes()))
 	}
 	newsz := w.n + maxLen
@@ -172,14 +198,10 @@ func (w *chunkWriter) WriteChunks(chks ...*ChunkMeta) error {
 		}
 	}
 
-	// Write chunks sequentially and set the reference field in the ChunkMeta.
-	w.crc32.Reset()
-	wr := io.MultiWriter(w.crc32, w.wbuf)
-
 	b := make([]byte, binary.MaxVarintLen32)
 	n := binary.PutUvarint(b, uint64(len(chks)))
 
-	if err := w.write(wr, b[:n]); err != nil {
+	if err := w.write(b[:n]); err != nil {
 		return err
 	}
 	seq := uint64(w.seq()) << 32
@@ -189,21 +211,25 @@ func (w *chunkWriter) WriteChunks(chks ...*ChunkMeta) error {
 
 		n = binary.PutUvarint(b, uint64(len(chk.Chunk.Bytes())))
 
-		if err := w.write(wr, b[:n]); err != nil {
+		if err := w.write(b[:n]); err != nil {
 			return err
 		}
-		if err := w.write(wr, []byte{byte(chk.Chunk.Encoding())}); err != nil {
+		if err := w.write([]byte{byte(chk.Chunk.Encoding())}); err != nil {
 			return err
 		}
-		if err := w.write(wr, chk.Chunk.Bytes()); err != nil {
+		if err := w.write(chk.Chunk.Bytes()); err != nil {
+			return err
+		}
+
+		w.crc32.Reset()
+		if err := chk.writeHash(w.crc32); err != nil {
+			return err
+		}
+		if err := w.write(w.crc32.Sum(nil)); err != nil {
 			return err
 		}
-		chk.Chunk = nil
 	}
 
-	if err := w.write(w.wbuf, w.crc32.Sum(nil)); err != nil {
-		return err
-	}
 	return nil
 }
 

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

@@ -1,8 +1,49 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// The code in this file was largely written by Damian Gryski as part of
+// https://github.com/dgryski/go-tsz and published under the license below.
+// It received minor modifications to suit Prometheus's needs.
+
+// Copyright (c) 2015,2016 Damian Gryski <damian@gryski.com>
+// All rights reserved.
+
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+
+// * Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 package chunks
 
 import "io"
 
-// bstream is a stream of bits
+// bstream is a stream of bits.
 type bstream struct {
 	stream []byte // the data stream
 	count  uint8  // how many bits are valid in current byte

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package chunks
 
 import (
@@ -5,7 +18,7 @@ import (
 	"fmt"
 )
 
-// Encoding is the identifier for a chunk encoding
+// Encoding is the identifier for a chunk encoding.
 type Encoding uint8
 
 func (e Encoding) String() string {

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

@@ -1,3 +1,46 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// The code in this file was largely written by Damian Gryski as part of
+// https://github.com/dgryski/go-tsz and published under the license below.
+// It was modified to accomodate reading from byte slices without modifying
+// the underlying bytes, which would panic when reading from mmaped
+// read-only byte slices.
+
+// Copyright (c) 2015,2016 Damian Gryski <damian@gryski.com>
+// All rights reserved.
+
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+
+// * Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 package chunks
 
 import (

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Package tsdb implements a time series storage for float64 sample data.
 package tsdb
 
@@ -33,6 +46,7 @@ var DefaultOptions = &Options{
 	MinBlockDuration:  3 * 60 * 60 * 1000,       // 2 hours in milliseconds
 	MaxBlockDuration:  24 * 60 * 60 * 1000,      // 1 days in milliseconds
 	AppendableBlocks:  2,
+	NoLockfile:        false,
 }
 
 // Options of the DB storage.
@@ -56,10 +70,15 @@ type Options struct {
 	// After a new block is started for timestamp t0 or higher, appends with
 	// timestamps as early as t0 - (n-1) * MinBlockDuration are valid.
 	AppendableBlocks int
+
+	// NoLockfile disables creation and consideration of a lock file.
+	NoLockfile bool
 }
 
 // Appender allows appending a batch of data. It must be completed with a
 // call to Commit or Rollback and must not be reused afterwards.
+//
+// Operations on the Appender interface are not goroutine-safe.
 type Appender interface {
 	// Add adds a sample pair for the given series. A reference number is
 	// returned which can be used to add further samples in the same or later
@@ -80,13 +99,11 @@ type Appender interface {
 	Rollback() error
 }
 
-const sep = '\xff'
-
 // DB handles reads and writes of time series falling into
 // a hashed partition of a seriedb.
 type DB struct {
 	dir   string
-	lockf lockfile.Lockfile
+	lockf *lockfile.Lockfile
 
 	logger  log.Logger
 	metrics *dbMetrics
@@ -146,13 +163,6 @@ func Open(dir string, l log.Logger, r prometheus.Registerer, opts *Options) (db
 	if err != nil {
 		return nil, err
 	}
-	lockf, err := lockfile.New(filepath.Join(absdir, "lock"))
-	if err != nil {
-		return nil, err
-	}
-	if err := lockf.TryLock(); err != nil {
-		return nil, errors.Wrapf(err, "open DB in %s", dir)
-	}
 
 	if l == nil {
 		l = log.NewLogfmtLogger(os.Stdout)
@@ -168,7 +178,6 @@ func Open(dir string, l log.Logger, r prometheus.Registerer, opts *Options) (db
 
 	db = &DB{
 		dir:      dir,
-		lockf:    lockf,
 		logger:   l,
 		metrics:  newDBMetrics(r),
 		opts:     opts,
@@ -176,6 +185,17 @@ func Open(dir string, l log.Logger, r prometheus.Registerer, opts *Options) (db
 		donec:    make(chan struct{}),
 		stopc:    make(chan struct{}),
 	}
+	if !opts.NoLockfile {
+		lockf, err := lockfile.New(filepath.Join(absdir, "lock"))
+		if err != nil {
+			return nil, err
+		}
+		if err := lockf.TryLock(); err != nil {
+			return nil, errors.Wrapf(err, "open DB in %s", dir)
+		}
+		db.lockf = &lockf
+	}
+
 	db.compactor = newCompactor(r, l, &compactorOptions{
 		maxBlockRange: opts.MaxBlockDuration,
 	})
@@ -452,7 +472,9 @@ func (db *DB) Close() error {
 	var merr MultiError
 
 	merr.Add(g.Wait())
-	merr.Add(db.lockf.Unlock())
+	if db.lockf != nil {
+		merr.Add(db.lockf.Unlock())
+	}
 
 	return merr.Err()
 }
@@ -505,8 +527,8 @@ func (a *dbAppender) Add(lset labels.Labels, t int64, v float64) (uint64, error)
 		return 0, err
 	}
 	a.samples++
-	// Store last byte of sequence number in 3rd byte of refernece.
+	// Store last byte of sequence number in 3rd byte of reference.
-	return ref | (uint64(h.meta.Sequence^0xff) << 40), nil
+	return ref | (uint64(h.meta.Sequence&0xff) << 40), nil
 }
 
 func (a *dbAppender) AddFast(ref uint64, t int64, v float64) error {
@@ -519,7 +541,7 @@ func (a *dbAppender) AddFast(ref uint64, t int64, v float64) error {
 		return err
 	}
 	// If the last byte of the sequence does not add up, the reference is not valid.
-	if uint64(h.meta.Sequence^0xff) != gen {
+	if uint64(h.meta.Sequence&0xff) != gen {
 		return ErrNotFound
 	}
 	if err := h.app.AddFast(ref, t, v); err != nil {
@@ -641,7 +663,7 @@ func (a *dbAppender) Rollback() error {
 	var g errgroup.Group
 
 	for _, h := range a.heads {
-		g.Go(h.app.Commit)
+		g.Go(h.app.Rollback)
 	}
 
 	return g.Wait()

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // +build !windows,!plan9,!solaris
 
 package tsdb

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (

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

@@ -0,0 +1,157 @@
+package tsdb
+
+import (
+	"encoding/binary"
+	"hash"
+	"unsafe"
+)
+
+// enbuf is a helper type to populate a byte slice with various types.
+type encbuf struct {
+	b []byte
+	c [binary.MaxVarintLen64]byte
+}
+
+func (e *encbuf) reset()      { e.b = e.b[:0] }
+func (e *encbuf) get() []byte { return e.b }
+func (e *encbuf) len() int    { return len(e.b) }
+
+func (e *encbuf) putString(s string) { e.b = append(e.b, s...) }
+func (e *encbuf) putBytes(b []byte)  { e.b = append(e.b, b...) }
+func (e *encbuf) putByte(c byte)     { e.b = append(e.b, c) }
+
+func (e *encbuf) putBE32int(x int)      { e.putBE32(uint32(x)) }
+func (e *encbuf) putBE64int(x int)      { e.putBE64(uint64(x)) }
+func (e *encbuf) putUvarint32(x uint32) { e.putUvarint64(uint64(x)) }
+func (e *encbuf) putUvarint(x int)      { e.putUvarint64(uint64(x)) }
+
+func (e *encbuf) putBE32(x uint32) {
+	binary.BigEndian.PutUint32(e.c[:], x)
+	e.b = append(e.b, e.c[:4]...)
+}
+
+func (e *encbuf) putBE64(x uint64) {
+	binary.BigEndian.PutUint64(e.c[:], x)
+	e.b = append(e.b, e.c[:8]...)
+}
+
+func (e *encbuf) putUvarint64(x uint64) {
+	n := binary.PutUvarint(e.c[:], x)
+	e.b = append(e.b, e.c[:n]...)
+}
+
+func (e *encbuf) putVarint64(x int64) {
+	n := binary.PutVarint(e.c[:], x)
+	e.b = append(e.b, e.c[:n]...)
+}
+
+// putVarintStr writes a string to the buffer prefixed by its varint length (in bytes!).
+func (e *encbuf) putUvarintStr(s string) {
+	b := *(*[]byte)(unsafe.Pointer(&s))
+	e.putUvarint(len(b))
+	e.putString(s)
+}
+
+// putHash appends a hash over the buffers current contents to the buffer.
+func (e *encbuf) putHash(h hash.Hash) {
+	h.Reset()
+	_, err := h.Write(e.b)
+	if err != nil {
+		panic(err) // The CRC32 implementation does not error
+	}
+	e.b = h.Sum(e.b)
+}
+
+// decbuf provides safe methods to extract data from a byte slice. It does all
+// necessary bounds checking and advancing of the byte slice.
+// Several datums can be extracted without checking for errors. However, before using
+// any datum, the err() method must be checked.
+type decbuf struct {
+	b []byte
+	e error
+}
+
+func (d *decbuf) uvarint() int { return int(d.uvarint64()) }
+func (d *decbuf) be32int() int { return int(d.be32()) }
+
+func (d *decbuf) uvarintStr() string {
+	l := d.uvarint64()
+	if d.e != nil {
+		return ""
+	}
+	if len(d.b) < int(l) {
+		d.e = errInvalidSize
+		return ""
+	}
+	s := yoloString(d.b[:l])
+	d.b = d.b[l:]
+	return s
+}
+
+func (d *decbuf) varint64() int64 {
+	if d.e != nil {
+		return 0
+	}
+	x, n := binary.Varint(d.b)
+	if n < 1 {
+		d.e = errInvalidSize
+		return 0
+	}
+	d.b = d.b[n:]
+	return x
+}
+
+func (d *decbuf) uvarint64() uint64 {
+	if d.e != nil {
+		return 0
+	}
+	x, n := binary.Uvarint(d.b)
+	if n < 1 {
+		d.e = errInvalidSize
+		return 0
+	}
+	d.b = d.b[n:]
+	return x
+}
+
+func (d *decbuf) be64() uint64 {
+	if d.e != nil {
+		return 0
+	}
+	if len(d.b) < 4 {
+		d.e = errInvalidSize
+		return 0
+	}
+	x := binary.BigEndian.Uint64(d.b)
+	d.b = d.b[8:]
+	return x
+}
+
+func (d *decbuf) be32() uint32 {
+	if d.e != nil {
+		return 0
+	}
+	if len(d.b) < 4 {
+		d.e = errInvalidSize
+		return 0
+	}
+	x := binary.BigEndian.Uint32(d.b)
+	d.b = d.b[4:]
+	return x
+}
+
+func (d *decbuf) decbuf(l int) decbuf {
+	if d.e != nil {
+		return decbuf{e: d.e}
+	}
+	if l > len(d.b) {
+		return decbuf{e: errInvalidSize}
+	}
+	r := decbuf{b: d.b[:l]}
+	d.b = d.b[l:]
+	return r
+}
+
+func (d *decbuf) err() error  { return d.e }
+func (d *decbuf) len() int    { return len(d.b) }
+func (d *decbuf) get() []byte { return d.b }

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (
@@ -283,6 +296,10 @@ type refdSample struct {
 }
 
 func (a *headAppender) Add(lset labels.Labels, t int64, v float64) (uint64, error) {
+	if !a.inBounds(t) {
+		return 0, ErrOutOfBounds
+	}
+
 	hash := lset.Hash()
 
 	if ms := a.get(hash, lset); ms != nil {
@@ -344,7 +361,10 @@ func (a *headAppender) AddFast(ref uint64, t int64, v float64) error {
 		if t < c.maxTime {
 			return ErrOutOfOrderSample
 		}
-		if c.maxTime == t && ms.lastValue != v {
+
+		// We are allowing exact duplicates as we can encounter them in valid cases
+		// like federation and erroring out at that time would be extremely noisy.
+		if c.maxTime == t && math.Float64bits(ms.lastValue) != math.Float64bits(v) {
 			return ErrAmendSample
 		}
 	}
@@ -410,23 +430,12 @@ func (a *headAppender) Commit() error {
 		return err
 	}
 
-	var (
+	total := uint64(len(a.samples))
-		total = uint64(len(a.samples))
-		mint  = int64(math.MaxInt64)
-		maxt  = int64(math.MinInt64)
-	)
 
 	for _, s := range a.samples {
 		if !a.series[s.ref].append(s.t, s.v) {
 			total--
 		}
-
-		if s.t < mint {
-			mint = s.t
-		}
-		if s.t > maxt {
-			maxt = s.t
-		}
 	}
 
 	a.mtx.RUnlock()
@@ -632,8 +641,8 @@ func (s *memSeries) append(t int64, v float64) bool {
 		c.minTime = t
 	} else {
 		c = s.head()
-		// Skip duplicate samples.
+		// Skip duplicate and out of order samples.
-		if c.maxTime == t && s.lastValue != v {
+		if c.maxTime >= t {
 			return false
 		}
 	}

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (
@@ -12,6 +25,8 @@ import (
 	"sort"
 	"strings"
 
+	"math"
+
 	"github.com/coreos/etcd/pkg/fileutil"
 	"github.com/pkg/errors"
 	"github.com/prometheus/tsdb/labels"
@@ -26,10 +41,48 @@ const (
 
 const compactionPageBytes = minSectorSize * 64
 
-// IndexWriter serialized the index for a block of series data.
+type indexWriterSeries struct {
-// The methods must generally be called in order they are specified.
+	labels labels.Labels
+	chunks []*ChunkMeta // series file offset of chunks
+	offset uint32       // index file offset of series reference
+}
+
+type indexWriterSeriesSlice []*indexWriterSeries
+
+func (s indexWriterSeriesSlice) Len() int      { return len(s) }
+func (s indexWriterSeriesSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+
+func (s indexWriterSeriesSlice) Less(i, j int) bool {
+	return labels.Compare(s[i].labels, s[j].labels) < 0
+}
+
+type indexWriterStage uint8
+
+const (
+	idxStagePopulate indexWriterStage = iota
+	idxStageLabelIndex
+	idxStagePostings
+	idxStageDone
+)
+
+func (s indexWriterStage) String() string {
+	switch s {
+	case idxStagePopulate:
+		return "populate"
+	case idxStageLabelIndex:
+		return "label index"
+	case idxStagePostings:
+		return "postings"
+	case idxStageDone:
+		return "done"
+	}
+	return "<unknown>"
+}
+
+// IndexWriter serializes the index for a block of series data.
+// The methods must generally be called in the order they are specified in.
 type IndexWriter interface {
-	// AddSeries populates the index writer witha series and its offsets
+	// AddSeries populates the index writer with a series and its offsets
 	// of chunks that the index can reference.
 	// The reference number is used to resolve a series against the postings
 	// list iterator. It only has to be available during the write processing.
@@ -48,22 +101,19 @@ type IndexWriter interface {
 	Close() error
 }
 
-type indexWriterSeries struct {
-	labels labels.Labels
-	chunks []*ChunkMeta // series file offset of chunks
-	offset uint32       // index file offset of series reference
-}
-
 // indexWriter implements the IndexWriter interface for the standard
 // serialization format.
 type indexWriter struct {
-	f       *os.File
+	f    *os.File
-	bufw    *bufio.Writer
+	fbuf *bufio.Writer
-	n       int64
+	pos  uint64
-	started bool
+
+	toc   indexTOC
+	stage indexWriterStage
 
 	// Reusable memory.
-	b       []byte
+	buf1    encbuf
+	buf2    encbuf
 	uint32s []uint32
 
 	series       map[uint32]*indexWriterSeries
@@ -74,6 +124,15 @@ type indexWriter struct {
 	crc32 hash.Hash
 }
 
+type indexTOC struct {
+	symbols           uint64
+	series            uint64
+	labelIndices      uint64
+	labelIndicesTable uint64
+	postings          uint64
+	postingsTable     uint64
+}
+
 func newIndexWriter(dir string) (*indexWriter, error) {
 	df, err := fileutil.OpenDir(dir)
 	if err != nil {
@@ -88,12 +147,14 @@ func newIndexWriter(dir string) (*indexWriter, error) {
 	}
 
 	iw := &indexWriter{
-		f:    f,
+		f:     f,
-		bufw: bufio.NewWriterSize(f, 1<<22),
+		fbuf:  bufio.NewWriterSize(f, 1<<22),
-		n:    0,
+		pos:   0,
+		stage: idxStagePopulate,
 
 		// Reusable memory.
-		b:       make([]byte, 0, 1<<23),
+		buf1:    encbuf{b: make([]byte, 0, 1<<22)},
+		buf2:    encbuf{b: make([]byte, 0, 1<<22)},
 		uint32s: make([]uint32, 0, 1<<15),
 
 		// Caches.
@@ -107,40 +168,87 @@ func newIndexWriter(dir string) (*indexWriter, error) {
 	return iw, nil
 }
 
-func (w *indexWriter) write(wr io.Writer, b []byte) error {
+func (w *indexWriter) write(bufs ...[]byte) error {
-	n, err := wr.Write(b)
+	for _, b := range bufs {
-	w.n += int64(n)
+		n, err := w.fbuf.Write(b)
-	return err
+		w.pos += uint64(n)
-}
+		if err != nil {
-
+			return err
-// section writes a CRC32 checksummed section of length l and guarded by flag.
+		}
-func (w *indexWriter) section(l int, flag byte, f func(w io.Writer) error) error {
+		// For now the index file must not grow beyond 4GiB. Some of the fixed-sized
-	w.crc32.Reset()
+		// offset references in v1 are only 4 bytes large.
-	wr := io.MultiWriter(w.crc32, w.bufw)
+		// Once we move to compressed/varint representations in those areas, this limitation
-
+		// can be lifted.
-	b := [5]byte{flag, 0, 0, 0, 0}
+		if w.pos > math.MaxUint32 {
-	binary.BigEndian.PutUint32(b[1:], uint32(l))
+			return errors.Errorf("exceeding max size of 4GiB")
-
+		}
-	if err := w.write(wr, b[:]); err != nil {
-		return errors.Wrap(err, "writing header")
-	}
-
-	if err := f(wr); err != nil {
-		return errors.Wrap(err, "write contents")
-	}
-	if err := w.write(w.bufw, w.crc32.Sum(nil)); err != nil {
-		return errors.Wrap(err, "writing checksum")
 	}
 	return nil
 }
 
+// addPadding adds zero byte padding until the file size is a multiple of n.
+func (w *indexWriter) addPadding(n int) error {
+	p := n - (int(w.pos) % n)
+	if p == 0 {
+		return nil
+	}
+	return errors.Wrap(w.write(make([]byte, p)), "add padding")
+}
+
+// ensureStage handles transitions between write stages and ensures that IndexWriter
+// methods are called in an order valid for the implementation.
+func (w *indexWriter) ensureStage(s indexWriterStage) error {
+	if w.stage == s {
+		return nil
+	}
+	if w.stage > s {
+		return errors.Errorf("invalid stage %q, currently at %q", s, w.stage)
+	}
+
+	// Complete population stage by writing symbols and series.
+	if w.stage == idxStagePopulate {
+		w.toc.symbols = w.pos
+		if err := w.writeSymbols(); err != nil {
+			return err
+		}
+		w.toc.series = w.pos
+		if err := w.writeSeries(); err != nil {
+			return err
+		}
+	}
+
+	// Mark start of sections in table of contents.
+	switch s {
+	case idxStageLabelIndex:
+		w.toc.labelIndices = w.pos
+
+	case idxStagePostings:
+		w.toc.labelIndicesTable = w.pos
+		if err := w.writeOffsetTable(w.labelIndexes); err != nil {
+			return err
+		}
+		w.toc.postings = w.pos
+
+	case idxStageDone:
+		w.toc.postingsTable = w.pos
+		if err := w.writeOffsetTable(w.postings); err != nil {
+			return err
+		}
+		if err := w.writeTOC(); err != nil {
+			return err
+		}
+	}
+
+	w.stage = s
+	return nil
+}
+
 func (w *indexWriter) writeMeta() error {
-	b := [8]byte{}
+	w.buf1.reset()
+	w.buf1.putBE32(MagicIndex)
+	w.buf1.putByte(indexFormatV1)
 
-	binary.BigEndian.PutUint32(b[:4], MagicIndex)
+	return w.write(w.buf1.get())
-	b[4] = flagStd
-
-	return w.write(w.bufw, b[:])
 }
 
 func (w *indexWriter) AddSeries(ref uint32, lset labels.Labels, chunks ...*ChunkMeta) error {
@@ -168,33 +276,27 @@ func (w *indexWriter) writeSymbols() error {
 	}
 	sort.Strings(symbols)
 
-	// The start of the section plus a 5 byte section header are our base.
+	const headerSize = 4
-	// TODO(fabxc): switch to relative offsets and hold sections in a TOC.
-	base := uint32(w.n) + 5
 
-	buf := [binary.MaxVarintLen32]byte{}
+	w.buf1.reset()
-	w.b = append(w.b[:0], flagStd)
+	w.buf2.reset()
+
+	w.buf2.putBE32int(len(symbols))
 
 	for _, s := range symbols {
-		w.symbols[s] = base + uint32(len(w.b))
+		w.symbols[s] = uint32(w.pos) + headerSize + uint32(w.buf2.len())
 
-		n := binary.PutUvarint(buf[:], uint64(len(s)))
+		// NOTE: len(s) gives the number of runes, not the number of bytes.
-		w.b = append(w.b, buf[:n]...)
+		// Therefore the read-back length for strings with unicode characters will
-		w.b = append(w.b, s...)
+		// be off when not using putCstr.
+		w.buf2.putUvarintStr(s)
 	}
 
-	return w.section(len(w.b), flagStd, func(wr io.Writer) error {
+	w.buf1.putBE32int(w.buf2.len())
-		return w.write(wr, w.b)
+	w.buf2.putHash(w.crc32)
-	})
-}
 
-type indexWriterSeriesSlice []*indexWriterSeries
+	err := w.write(w.buf1.get(), w.buf2.get())
-
+	return errors.Wrap(err, "write symbols")
-func (s indexWriterSeriesSlice) Len() int      { return len(s) }
-func (s indexWriterSeriesSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
-
-func (s indexWriterSeriesSlice) Less(i, j int) bool {
-	return labels.Compare(s[i].labels, s[j].labels) < 0
 }
 
 func (w *indexWriter) writeSeries() error {
@@ -206,64 +308,52 @@ func (w *indexWriter) writeSeries() error {
 	}
 	sort.Sort(series)
 
-	// Current end of file plus 5 bytes for section header.
+	// Header holds number of series.
-	// TODO(fabxc): switch to relative offsets.
+	w.buf1.reset()
-	base := uint32(w.n) + 5
+	w.buf1.putBE32int(len(series))
 
-	w.b = w.b[:0]
+	if err := w.write(w.buf1.get()); err != nil {
-	buf := make([]byte, binary.MaxVarintLen64)
+		return errors.Wrap(err, "write series count")
+	}
 
 	for _, s := range series {
-		// Write label set symbol references.
+		s.offset = uint32(w.pos)
-		s.offset = base + uint32(len(w.b))
 
-		n := binary.PutUvarint(buf, uint64(len(s.labels)))
+		w.buf2.reset()
-		w.b = append(w.b, buf[:n]...)
+		w.buf2.putUvarint(len(s.labels))
 
 		for _, l := range s.labels {
-			n = binary.PutUvarint(buf, uint64(w.symbols[l.Name]))
+			w.buf2.putUvarint32(w.symbols[l.Name])
-			w.b = append(w.b, buf[:n]...)
+			w.buf2.putUvarint32(w.symbols[l.Value])
-			n = binary.PutUvarint(buf, uint64(w.symbols[l.Value]))
-			w.b = append(w.b, buf[:n]...)
 		}
 
-		// Write chunks meta data including reference into chunk file.
+		w.buf2.putUvarint(len(s.chunks))
-		n = binary.PutUvarint(buf, uint64(len(s.chunks)))
-		w.b = append(w.b, buf[:n]...)
 
 		for _, c := range s.chunks {
-			n = binary.PutVarint(buf, c.MinTime)
+			w.buf2.putVarint64(c.MinTime)
-			w.b = append(w.b, buf[:n]...)
+			w.buf2.putVarint64(c.MaxTime)
-			n = binary.PutVarint(buf, c.MaxTime)
+			w.buf2.putUvarint64(c.Ref)
-			w.b = append(w.b, buf[:n]...)
+		}
 
-			n = binary.PutUvarint(buf, uint64(c.Ref))
+		w.buf1.reset()
-			w.b = append(w.b, buf[:n]...)
+		w.buf1.putUvarint(w.buf2.len())
+
+		w.buf2.putHash(w.crc32)
+
+		if err := w.write(w.buf1.get(), w.buf2.get()); err != nil {
+			return errors.Wrap(err, "write series data")
 		}
 	}
 
-	return w.section(len(w.b), flagStd, func(wr io.Writer) error {
-		return w.write(wr, w.b)
-	})
-}
-
-func (w *indexWriter) init() error {
-	if err := w.writeSymbols(); err != nil {
-		return err
-	}
-	if err := w.writeSeries(); err != nil {
-		return err
-	}
-	w.started = true
-
 	return nil
 }
 
 func (w *indexWriter) WriteLabelIndex(names []string, values []string) error {
-	if !w.started {
+	if len(values)%len(names) != 0 {
-		if err := w.init(); err != nil {
+		return errors.Errorf("invalid value list length %d for %d names", len(values), len(names))
-			return err
+	}
-		}
+	if err := w.ensureStage(idxStageLabelIndex); err != nil {
+		return errors.Wrap(err, "ensure stage")
 	}
 
 	valt, err := newStringTuples(values, len(names))
@@ -272,45 +362,84 @@ func (w *indexWriter) WriteLabelIndex(names []string, values []string) error {
 	}
 	sort.Sort(valt)
 
+	// Align beginning to 4 bytes for more efficient index list scans.
+	if err := w.addPadding(4); err != nil {
+		return err
+	}
+
 	w.labelIndexes = append(w.labelIndexes, hashEntry{
-		name:   strings.Join(names, string(sep)),
+		keys:   names,
-		offset: uint32(w.n),
+		offset: w.pos,
 	})
 
-	buf := make([]byte, binary.MaxVarintLen32)
+	w.buf2.reset()
-	n := binary.PutUvarint(buf, uint64(len(names)))
+	w.buf2.putBE32int(len(names))
+	w.buf2.putBE32int(valt.Len())
 
-	l := n + len(values)*4
+	for _, v := range valt.s {
+		w.buf2.putBE32(w.symbols[v])
+	}
 
-	return w.section(l, flagStd, func(wr io.Writer) error {
+	w.buf1.reset()
-		// First byte indicates tuple size for index.
+	w.buf1.putBE32int(w.buf2.len())
-		if err := w.write(wr, buf[:n]); err != nil {
+
-			return err
+	w.buf2.putHash(w.crc32)
+
+	err = w.write(w.buf1.get(), w.buf2.get())
+	return errors.Wrap(err, "write label index")
+}
+
+// writeOffsetTable writes a sequence of readable hash entries.
+func (w *indexWriter) writeOffsetTable(entries []hashEntry) error {
+	w.buf1.reset()
+	w.buf1.putBE32int(len(entries))
+
+	w.buf2.reset()
+
+	for _, e := range entries {
+		w.buf2.putUvarint(len(e.keys))
+		for _, k := range e.keys {
+			w.buf2.putUvarintStr(k)
 		}
+		w.buf2.putUvarint64(e.offset)
+	}
 
-		for _, v := range valt.s {
+	w.buf1.putBE32int(w.buf2.len())
-			binary.BigEndian.PutUint32(buf, w.symbols[v])
+	w.buf2.putHash(w.crc32)
 
-			if err := w.write(wr, buf[:4]); err != nil {
+	return w.write(w.buf1.get(), w.buf2.get())
-				return err
+}
-			}
+
-		}
+const indexTOCLen = 6*8 + 4
-		return nil
+
-	})
+func (w *indexWriter) writeTOC() error {
+	w.buf1.reset()
+
+	w.buf1.putBE64(w.toc.symbols)
+	w.buf1.putBE64(w.toc.series)
+	w.buf1.putBE64(w.toc.labelIndices)
+	w.buf1.putBE64(w.toc.labelIndicesTable)
+	w.buf1.putBE64(w.toc.postings)
+	w.buf1.putBE64(w.toc.postingsTable)
+
+	w.buf1.putHash(w.crc32)
+
+	return w.write(w.buf1.get())
 }
 
 func (w *indexWriter) WritePostings(name, value string, it Postings) error {
-	if !w.started {
+	if err := w.ensureStage(idxStagePostings); err != nil {
-		if err := w.init(); err != nil {
+		return errors.Wrap(err, "ensure stage")
-			return err
-		}
 	}
 
-	key := name + string(sep) + value
+	// Align beginning to 4 bytes for more efficient postings list scans.
+	if err := w.addPadding(4); err != nil {
+		return err
+	}
 
 	w.postings = append(w.postings, hashEntry{
-		name:   key,
+		keys:   []string{name, value},
-		offset: uint32(w.n),
+		offset: w.pos,
 	})
 
 	// Order of the references in the postings list does not imply order
@@ -328,22 +457,22 @@ func (w *indexWriter) WritePostings(name, value string, it Postings) error {
 	if err := it.Err(); err != nil {
 		return err
 	}
-
 	sort.Sort(uint32slice(refs))
 
-	w.b = w.b[:0]
+	w.buf2.reset()
-	buf := make([]byte, 4)
+	w.buf2.putBE32int(len(refs))
 
 	for _, r := range refs {
-		binary.BigEndian.PutUint32(buf, r)
+		w.buf2.putBE32(r)
-		w.b = append(w.b, buf...)
 	}
 
-	w.uint32s = refs[:0]
+	w.buf1.reset()
+	w.buf1.putBE32int(w.buf2.len())
 
-	return w.section(len(w.b), flagStd, func(wr io.Writer) error {
+	w.buf2.putHash(w.crc32)
-		return w.write(wr, w.b)
+
-	})
+	err := w.write(w.buf1.get(), w.buf2.get())
+	return errors.Wrap(err, "write postings")
 }
 
 type uint32slice []uint32
@@ -353,56 +482,15 @@ func (s uint32slice) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 func (s uint32slice) Less(i, j int) bool { return s[i] < s[j] }
 
 type hashEntry struct {
-	name   string
+	keys   []string
-	offset uint32
+	offset uint64
-}
-
-func (w *indexWriter) writeHashmap(h []hashEntry) error {
-	w.b = w.b[:0]
-	buf := [binary.MaxVarintLen32]byte{}
-
-	for _, e := range h {
-		n := binary.PutUvarint(buf[:], uint64(len(e.name)))
-		w.b = append(w.b, buf[:n]...)
-		w.b = append(w.b, e.name...)
-
-		n = binary.PutUvarint(buf[:], uint64(e.offset))
-		w.b = append(w.b, buf[:n]...)
-	}
-
-	return w.section(len(w.b), flagStd, func(wr io.Writer) error {
-		return w.write(wr, w.b)
-	})
-}
-
-func (w *indexWriter) finalize() error {
-	// Write out hash maps to jump to correct label index and postings sections.
-	lo := uint32(w.n)
-	if err := w.writeHashmap(w.labelIndexes); err != nil {
-		return err
-	}
-
-	po := uint32(w.n)
-	if err := w.writeHashmap(w.postings); err != nil {
-		return err
-	}
-
-	// Terminate index file with offsets to hashmaps. This is the entry Pointer
-	// for any index query.
-	// TODO(fabxc): also store offset to series section to allow plain
-	// iteration over all existing series?
-	b := [8]byte{}
-	binary.BigEndian.PutUint32(b[:4], lo)
-	binary.BigEndian.PutUint32(b[4:], po)
-
-	return w.write(w.bufw, b[:])
 }
 
 func (w *indexWriter) Close() error {
-	if err := w.finalize(); err != nil {
+	if err := w.ensureStage(idxStageDone); err != nil {
 		return err
 	}
-	if err := w.bufw.Flush(); err != nil {
+	if err := w.fbuf.Flush(); err != nil {
 		return err
 	}
 	if err := fileutil.Fsync(w.f); err != nil {
@@ -440,7 +528,8 @@ type StringTuples interface {
 
 type indexReader struct {
 	// The underlying byte slice holding the encoded series data.
-	b []byte
+	b   []byte
+	toc indexTOC
 
 	// Close that releases the underlying resources of the byte slice.
 	c io.Closer
@@ -471,57 +560,77 @@ func newIndexReader(dir string) (*indexReader, error) {
 		return nil, errors.Errorf("invalid magic number %x", m)
 	}
 
-	// The last two 4 bytes hold the pointers to the hashmaps.
+	if err := r.readTOC(); err != nil {
-	loff := binary.BigEndian.Uint32(r.b[len(r.b)-8 : len(r.b)-4])
+		return nil, errors.Wrap(err, "read TOC")
-	poff := binary.BigEndian.Uint32(r.b[len(r.b)-4:])
+	}
 
-	flag, b, err := r.section(loff)
+	r.labels, err = r.readOffsetTable(r.toc.labelIndicesTable)
 	if err != nil {
-		return nil, errors.Wrapf(err, "label index hashmap section at %d", loff)
+		return nil, errors.Wrap(err, "read label index table")
 	}
-	if r.labels, err = readHashmap(flag, b); err != nil {
+	r.postings, err = r.readOffsetTable(r.toc.postingsTable)
-		return nil, errors.Wrap(err, "read label index hashmap")
-	}
-	flag, b, err = r.section(poff)
 	if err != nil {
-		return nil, errors.Wrapf(err, "postings hashmap section at %d", loff)
+		return nil, errors.Wrap(err, "read postings table")
-	}
-	if r.postings, err = readHashmap(flag, b); err != nil {
-		return nil, errors.Wrap(err, "read postings hashmap")
 	}
 
 	return r, nil
 }
 
-func readHashmap(flag byte, b []byte) (map[string]uint32, error) {
+func (r *indexReader) readTOC() error {
-	if flag != flagStd {
+	d := r.decbufAt(len(r.b) - indexTOCLen)
-		return nil, errInvalidFlag
+
+	r.toc.symbols = d.be64()
+	r.toc.series = d.be64()
+	r.toc.labelIndices = d.be64()
+	r.toc.labelIndicesTable = d.be64()
+	r.toc.postings = d.be64()
+	r.toc.postingsTable = d.be64()
+
+	// TODO(fabxc): validate checksum.
+
+	return nil
+}
+
+func (r *indexReader) decbufAt(off int) decbuf {
+	if len(r.b) < off {
+		return decbuf{e: errInvalidSize}
 	}
-	h := make(map[string]uint32, 512)
+	return decbuf{b: r.b[off:]}
+}
 
-	for len(b) > 0 {
+// readOffsetTable reads an offset table at the given position and returns a map
-		l, n := binary.Uvarint(b)
+// with the key strings concatenated by the 0xff unicode non-character.
-		if n < 1 {
+func (r *indexReader) readOffsetTable(off uint64) (map[string]uint32, error) {
-			return nil, errors.Wrap(errInvalidSize, "read key length")
+	// A table might not have been written at all, in which case the position
-		}
+	// is zeroed out.
-		b = b[n:]
+	if off == 0 {
-
+		return nil, nil
-		if len(b) < int(l) {
-			return nil, errors.Wrap(errInvalidSize, "read key")
-		}
-		s := string(b[:l])
-		b = b[l:]
-
-		o, n := binary.Uvarint(b)
-		if n < 1 {
-			return nil, errors.Wrap(errInvalidSize, "read offset value")
-		}
-		b = b[n:]
-
-		h[s] = uint32(o)
 	}
 
-	return h, nil
+	const sep = "\xff"
+
+	var (
+		d1  = r.decbufAt(int(off))
+		cnt = d1.be32()
+		d2  = d1.decbuf(d1.be32int())
+	)
+
+	res := make(map[string]uint32, 512)
+
+	for d2.err() == nil && d2.len() > 0 && cnt > 0 {
+		keyCount := int(d2.uvarint())
+		keys := make([]string, 0, keyCount)
+
+		for i := 0; i < keyCount; i++ {
+			keys = append(keys, d2.uvarintStr())
+		}
+		res[strings.Join(keys, sep)] = uint32(d2.uvarint())
+
+		cnt--
+	}
+
+	// TODO(fabxc): verify checksum from remainer of d1.
+	return res, d2.err()
 }
 
 func (r *indexReader) Close() error {
@@ -548,25 +657,19 @@ func (r *indexReader) section(o uint32) (byte, []byte, error) {
 }
 
 func (r *indexReader) lookupSymbol(o uint32) (string, error) {
-	if int(o) > len(r.b) {
+	d := r.decbufAt(int(o))
-		return "", errors.Errorf("invalid symbol offset %d", o)
-	}
-	l, n := binary.Uvarint(r.b[o:])
-	if n < 0 {
-		return "", errors.New("reading symbol length failed")
-	}
 
-	end := int(o) + n + int(l)
+	s := d.uvarintStr()
-	if end > len(r.b) {
+	if d.err() != nil {
-		return "", errors.New("invalid length")
+		return "", errors.Wrapf(d.err(), "read symbol at %d", o)
 	}
-	b := r.b[int(o)+n : end]
+	return s, nil
-
-	return yoloString(b), nil
 }
 
 func (r *indexReader) LabelValues(names ...string) (StringTuples, error) {
-	key := strings.Join(names, string(sep))
+	const sep = "\xff"
+
+	key := strings.Join(names, sep)
 	off, ok := r.labels[key]
 	if !ok {
 		// XXX(fabxc): hot fix. Should return a partial data error and handle cases
@@ -575,21 +678,21 @@ func (r *indexReader) LabelValues(names ...string) (StringTuples, error) {
 		//return nil, fmt.Errorf("label index doesn't exist")
 	}
 
-	flag, b, err := r.section(off)
+	d1 := r.decbufAt(int(off))
-	if err != nil {
+	d2 := d1.decbuf(d1.be32int())
-		return nil, errors.Wrapf(err, "section at %d", off)
+
-	}
+	nc := d2.be32int()
-	if flag != flagStd {
+	d2.be32() // consume unused value entry count.
-		return nil, errInvalidFlag
+
-	}
+	if d2.err() != nil {
-	l, n := binary.Uvarint(b)
+		return nil, errors.Wrap(d2.err(), "read label value index")
-	if n < 1 {
-		return nil, errors.Wrap(errInvalidSize, "read label index size")
 	}
 
+	// TODO(fabxc): verify checksum in 4 remaining bytes of d1.
+
 	st := &serializedStringTuples{
-		l:      int(l),
+		l:      nc,
-		b:      b[n:],
+		b:      d2.get(),
 		lookup: r.lookupSymbol,
 	}
 	return st, nil
@@ -601,110 +704,89 @@ func (emptyStringTuples) At(i int) ([]string, error) { return nil, nil }
 func (emptyStringTuples) Len() int                   { return 0 }
 
 func (r *indexReader) LabelIndices() ([][]string, error) {
+	const sep = "\xff"
+
 	res := [][]string{}
 
 	for s := range r.labels {
-		res = append(res, strings.Split(s, string(sep)))
+		res = append(res, strings.Split(s, sep))
 	}
 	return res, nil
 }
 
 func (r *indexReader) Series(ref uint32) (labels.Labels, []*ChunkMeta, error) {
-	k, n := binary.Uvarint(r.b[ref:])
+	d1 := r.decbufAt(int(ref))
-	if n < 1 {
+	d2 := d1.decbuf(int(d1.uvarint()))
-		return nil, nil, errors.Wrap(errInvalidSize, "number of labels")
-	}
 
-	b := r.b[int(ref)+n:]
+	k := int(d2.uvarint())
 	lbls := make(labels.Labels, 0, k)
 
-	for i := 0; i < 2*int(k); i += 2 {
+	for i := 0; i < k; i++ {
-		o, m := binary.Uvarint(b)
+		lno := uint32(d2.uvarint())
-		if m < 1 {
+		lvo := uint32(d2.uvarint())
-			return nil, nil, errors.Wrap(errInvalidSize, "symbol offset")
-		}
-		n, err := r.lookupSymbol(uint32(o))
-		if err != nil {
-			return nil, nil, errors.Wrap(err, "symbol lookup")
-		}
-		b = b[m:]
 
-		o, m = binary.Uvarint(b)
+		if d2.err() != nil {
-		if m < 1 {
+			return nil, nil, errors.Wrap(d2.err(), "read series label offsets")
-			return nil, nil, errors.Wrap(errInvalidSize, "symbol offset")
 		}
-		v, err := r.lookupSymbol(uint32(o))
-		if err != nil {
-			return nil, nil, errors.Wrap(err, "symbol lookup")
-		}
-		b = b[m:]
 
-		lbls = append(lbls, labels.Label{
+		ln, err := r.lookupSymbol(lno)
-			Name:  n,
+		if err != nil {
-			Value: v,
+			return nil, nil, errors.Wrap(err, "lookup label name")
-		})
+		}
+		lv, err := r.lookupSymbol(lvo)
+		if err != nil {
+			return nil, nil, errors.Wrap(err, "lookup label value")
+		}
+
+		lbls = append(lbls, labels.Label{Name: ln, Value: lv})
 	}
 
 	// Read the chunks meta data.
-	k, n = binary.Uvarint(b)
+	k = int(d2.uvarint())
-	if n < 1 {
-		return nil, nil, errors.Wrap(errInvalidSize, "number of chunks")
-	}
-
-	b = b[n:]
 	chunks := make([]*ChunkMeta, 0, k)
 
-	for i := 0; i < int(k); i++ {
+	for i := 0; i < k; i++ {
-		firstTime, n := binary.Varint(b)
+		mint := d2.varint64()
-		if n < 1 {
+		maxt := d2.varint64()
-			return nil, nil, errors.Wrap(errInvalidSize, "first time")
+		off := d2.uvarint64()
-		}
-		b = b[n:]
 
-		lastTime, n := binary.Varint(b)
+		if d2.err() != nil {
-		if n < 1 {
+			return nil, nil, errors.Wrapf(d2.err(), "read meta for chunk %d", i)
-			return nil, nil, errors.Wrap(errInvalidSize, "last time")
 		}
-		b = b[n:]
-
-		o, n := binary.Uvarint(b)
-		if n < 1 {
-			return nil, nil, errors.Wrap(errInvalidSize, "chunk offset")
-		}
-		b = b[n:]
 
 		chunks = append(chunks, &ChunkMeta{
-			Ref:     o,
+			Ref:     off,
-			MinTime: firstTime,
+			MinTime: mint,
-			MaxTime: lastTime,
+			MaxTime: maxt,
 		})
 	}
 
+	// TODO(fabxc): verify CRC32.
+
 	return lbls, chunks, nil
 }
 
 func (r *indexReader) Postings(name, value string) (Postings, error) {
-	key := name + string(sep) + value
+	const sep = "\xff"
+	key := strings.Join([]string{name, value}, sep)
 
 	off, ok := r.postings[key]
 	if !ok {
 		return emptyPostings, nil
 	}
 
-	flag, b, err := r.section(off)
+	d1 := r.decbufAt(int(off))
-	if err != nil {
+	d2 := d1.decbuf(d1.be32int())
-		return nil, errors.Wrapf(err, "section at %d", off)
+
+	d2.be32() // consume unused postings list length.
+
+	if d2.err() != nil {
+		return nil, errors.Wrap(d2.err(), "get postings bytes")
 	}
 
-	if flag != flagStd {
+	// TODO(fabxc): read checksum from 4 remainer bytes of d1 and verify.
-		return nil, errors.Wrapf(errInvalidFlag, "section at %d", off)
-	}
 
-	// Add iterator over the bytes.
+	return newBigEndianPostings(d2.get()), nil
-	if len(b)%4 != 0 {
-		return nil, errors.Wrap(errInvalidSize, "plain postings entry")
-	}
-	return newBigEndianPostings(b), nil
 }
 
 type stringTuples struct {
@@ -753,7 +835,6 @@ type serializedStringTuples struct {
 }
 
 func (t *serializedStringTuples) Len() int {
-	// TODO(fabxc): Cache this?
 	return len(t.b) / (4 * t.l)
 }
 

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package labels
 
 import (
@@ -71,7 +84,7 @@ func (ls Labels) Equals(o Labels) bool {
 		return false
 	}
 	for i, l := range ls {
-		if l.Name != o[i].Name || l.Value != o[i].Value {
+		if o[i] != l {
 			return false
 		}
 	}

vendor/github.com/prometheus/tsdb/labels/selector.go

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package labels
 
 import "regexp"

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (
@@ -139,30 +152,30 @@ func Merge(its ...Postings) Postings {
 	a := its[0]
 
 	for _, b := range its[1:] {
-		a = newMergePostings(a, b)
+		a = newMergedPostings(a, b)
 	}
 	return a
 }
 
-type mergePostings struct {
+type mergedPostings struct {
 	a, b     Postings
 	aok, bok bool
 	cur      uint32
 }
 
-func newMergePostings(a, b Postings) *mergePostings {
+func newMergedPostings(a, b Postings) *mergedPostings {
-	it := &mergePostings{a: a, b: b}
+	it := &mergedPostings{a: a, b: b}
 	it.aok = it.a.Next()
 	it.bok = it.b.Next()
 
 	return it
 }
 
-func (it *mergePostings) At() uint32 {
+func (it *mergedPostings) At() uint32 {
 	return it.cur
 }
 
-func (it *mergePostings) Next() bool {
+func (it *mergedPostings) Next() bool {
 	if !it.aok && !it.bok {
 		return false
 	}
@@ -197,13 +210,14 @@ func (it *mergePostings) Next() bool {
 	return true
 }
 
-func (it *mergePostings) Seek(id uint32) bool {
+func (it *mergedPostings) Seek(id uint32) bool {
 	it.aok = it.a.Seek(id)
 	it.bok = it.b.Seek(id)
+
 	return it.Next()
 }
 
-func (it *mergePostings) Err() error {
+func (it *mergedPostings) Err() error {
 	if it.a.Err() != nil {
 		return it.a.Err()
 	}

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (
@@ -153,6 +166,9 @@ func (q *blockQuerier) Select(ms ...labels.Matcher) SeriesSet {
 			mint:   q.mint,
 			maxt:   q.maxt,
 		},
+
+		mint: q.mint,
+		maxt: q.maxt,
 	}
 }
 
@@ -397,11 +413,15 @@ func (s *populatedChunkSeries) Next() bool {
 	for s.set.Next() {
 		lset, chks := s.set.At()
 
-		for i, c := range chks {
+		for len(chks) > 0 {
-			if c.MaxTime < s.mint {
+			if chks[0].MaxTime >= s.mint {
-				chks = chks[1:]
+				break
-				continue
 			}
+			chks = chks[1:]
+		}
+
+		// Break out at the first chunk that has no overlap with mint, maxt.
+		for i, c := range chks {
 			if c.MinTime > s.maxt {
 				chks = chks[:i]
 				break
@@ -411,6 +431,7 @@ func (s *populatedChunkSeries) Next() bool {
 				return false
 			}
 		}
+
 		if len(chks) == 0 {
 			continue
 		}
@@ -431,12 +452,14 @@ type blockSeriesSet struct {
 	set chunkSeriesSet
 	err error
 	cur Series
+
+	mint, maxt int64
 }
 
 func (s *blockSeriesSet) Next() bool {
 	for s.set.Next() {
 		lset, chunks := s.set.At()
-		s.cur = &chunkSeries{labels: lset, chunks: chunks}
+		s.cur = &chunkSeries{labels: lset, chunks: chunks, mint: s.mint, maxt: s.maxt}
 		return true
 	}
 	if s.set.Err() != nil {
@@ -453,6 +476,8 @@ func (s *blockSeriesSet) Err() error { return s.err }
 type chunkSeries struct {
 	labels labels.Labels
 	chunks []*ChunkMeta // in-order chunk refs
+
+	mint, maxt int64
 }
 
 func (s *chunkSeries) Labels() labels.Labels {
@@ -460,14 +485,14 @@ func (s *chunkSeries) Labels() labels.Labels {
 }
 
 func (s *chunkSeries) Iterator() SeriesIterator {
-	return newChunkSeriesIterator(s.chunks)
+	return newChunkSeriesIterator(s.chunks, s.mint, s.maxt)
 }
 
 // SeriesIterator iterates over the data of a time series.
 type SeriesIterator interface {
 	// Seek advances the iterator forward to the given timestamp.
-	// If there's no value exactly at ts, it advances to the last value
+	// If there's no value exactly at t, it advances to the first value
-	// before tt.
+	// after t.
 	Seek(t int64) bool
 	// At returns the current timestamp/value pair.
 	At() (t int64, v float64)
@@ -488,7 +513,7 @@ func (s *chainedSeries) Labels() labels.Labels {
 }
 
 func (s *chainedSeries) Iterator() SeriesIterator {
-	return &chainedSeriesIterator{series: s.series}
+	return newChainedSeriesIterator(s.series...)
 }
 
 // chainedSeriesIterator implements a series iterater over a list
@@ -500,6 +525,14 @@ type chainedSeriesIterator struct {
 	cur SeriesIterator
 }
 
+func newChainedSeriesIterator(s ...Series) *chainedSeriesIterator {
+	return &chainedSeriesIterator{
+		series: s,
+		i:      0,
+		cur:    s[0].Iterator(),
+	}
+}
+
 func (it *chainedSeriesIterator) Seek(t int64) bool {
 	// We just scan the chained series sequentially as they are already
 	// pre-selected by relevant time and should be accessed sequentially anyway.
@@ -516,9 +549,6 @@ func (it *chainedSeriesIterator) Seek(t int64) bool {
 }
 
 func (it *chainedSeriesIterator) Next() bool {
-	if it.cur == nil {
-		it.cur = it.series[it.i].Iterator()
-	}
 	if it.cur.Next() {
 		return true
 	}
@@ -550,17 +580,35 @@ type chunkSeriesIterator struct {
 
 	i   int
 	cur chunks.Iterator
+
+	maxt, mint int64
 }
 
-func newChunkSeriesIterator(cs []*ChunkMeta) *chunkSeriesIterator {
+func newChunkSeriesIterator(cs []*ChunkMeta, mint, maxt int64) *chunkSeriesIterator {
 	return &chunkSeriesIterator{
 		chunks: cs,
 		i:      0,
 		cur:    cs[0].Chunk.Iterator(),
+
+		mint: mint,
+		maxt: maxt,
 	}
 }
 
+func (it *chunkSeriesIterator) inBounds(t int64) bool {
+	return t >= it.mint && t <= it.maxt
+}
+
 func (it *chunkSeriesIterator) Seek(t int64) (ok bool) {
+	if t > it.maxt {
+		return false
+	}
+
+	// Seek to the first valid value after t.
+	if t < it.mint {
+		t = it.mint
+	}
+
 	// Only do binary search forward to stay in line with other iterators
 	// that can only move forward.
 	x := sort.Search(len(it.chunks[it.i:]), func(i int) bool { return it.chunks[i].MinTime >= t })
@@ -569,10 +617,10 @@ func (it *chunkSeriesIterator) Seek(t int64) (ok bool) {
 	// If the timestamp was not found, it might be in the last chunk.
 	if x == len(it.chunks) {
 		x--
-	}
+
-	// Go to previous chunk if the chunk doesn't exactly start with t.
+		// Go to previous chunk if the chunk doesn't exactly start with t.
-	// If we are already at the first chunk, we use it as it's the best we have.
+		// If we are already at the first chunk, we use it as it's the best we have.
-	if x > 0 && it.chunks[x].MinTime > t {
+	} else if x > 0 && it.chunks[x].MinTime > t {
 		x--
 	}
 
@@ -593,9 +641,13 @@ func (it *chunkSeriesIterator) At() (t int64, v float64) {
 }
 
 func (it *chunkSeriesIterator) Next() bool {
-	if it.cur.Next() {
+	for it.cur.Next() {
-		return true
+		t, _ := it.cur.At()
+		if it.inBounds(t) {
+			return true
+		}
 	}
+
 	if err := it.cur.Err(); err != nil {
 		return false
 	}

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

@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package tsdb
 
 import (
@@ -134,7 +147,7 @@ func (w *WAL) initSegments() error {
 	if len(fns) == 0 {
 		return nil
 	}
-	// We must open all file in read mode as we may have to truncate along
+	// We must open all files in read/write mode as we may have to truncate along
 	// the way and any file may become the tail.
 	for _, fn := range fns {
 		f, err := os.OpenFile(fn, os.O_RDWR, 0666)
@@ -165,10 +178,10 @@ func (w *WAL) initSegments() error {
 	return nil
 }
 
-// cut finishes the currently active segments and open the next one.
+// cut finishes the currently active segments and opens the next one.
 // The encoder is reset to point to the new segment.
 func (w *WAL) cut() error {
-	// Sync current tail to disc and close.
+	// Sync current tail to disk and close.
 	if tf := w.tail(); tf != nil {
 		if err := w.sync(); err != nil {
 			return err
@@ -263,7 +276,7 @@ func (w *WAL) run(interval time.Duration) {
 	}
 }
 
-// Close sync all data and closes the underlying resources.
+// Close syncs all data and closes the underlying resources.
 func (w *WAL) Close() error {
 	close(w.stopc)
 	<-w.donec
@@ -296,9 +309,10 @@ func (w *WAL) entry(et WALEntryType, flag byte, buf []byte) error {
 	w.mtx.Lock()
 	defer w.mtx.Unlock()
 
-	// Cut to the next segment if exceeds the file size unless it would also
+	// Cut to the next segment if the entry exceeds the file size unless it would also
 	// exceed the size of a new segment.
 	var (
+		// 6-byte header + 4-byte CRC32 + buf.
 		sz    = int64(6 + 4 + len(buf))
 		newsz = w.curN + sz
 	)

vendor/vendor.json

@@ -645,22 +645,22 @@
 			"revisionTime": "2016-04-11T19:08:41Z"
 		},
 		{
-			"checksumSHA1": "R7aNHvNnDiTb6t7z8FehPAo3PdM=",
+			"checksumSHA1": "0wu/AzUWMurN/T5VBKCrvhf7c7E=",
 			"path": "github.com/prometheus/tsdb",
-			"revision": "721df536eb1a6e6f91785f138ca24917222f8461",
+			"revision": "44769c1654f699931b2d3a2928326ac2d02d9149",
-			"revisionTime": "2017-04-09T08:18:19Z"
+			"revisionTime": "2017-05-09T10:52:47Z"
 		},
 		{
-			"checksumSHA1": "Qwlzvcx5Lbo9Nzb75AGgiiGszZI=",
+			"checksumSHA1": "9EH3v+JdbikCUJAgD4VEOPIaWfs=",
 			"path": "github.com/prometheus/tsdb/chunks",
-			"revision": "10c7c9acbe0175a411bce90cd7a0d9d7a13d6a83",
+			"revision": "44769c1654f699931b2d3a2928326ac2d02d9149",
-			"revisionTime": "2017-04-04T09:27:26Z"
+			"revisionTime": "2017-05-09T10:52:47Z"
 		},
 		{
-			"checksumSHA1": "ed5dnejBTbr0FKdzKRAC91bHRgE=",
+			"checksumSHA1": "3RHZcB/ZvIae9K0tJxNlajJg0jA=",
 			"path": "github.com/prometheus/tsdb/labels",
-			"revision": "770d00800212502dfef71a6a7df23e3ced4459d9",
+			"revision": "44769c1654f699931b2d3a2928326ac2d02d9149",
-			"revisionTime": "2017-04-05T12:14:30Z"
+			"revisionTime": "2017-05-09T10:52:47Z"
 		},
 		{
 			"checksumSHA1": "+49Vr4Me28p3cR+gxX5SUQHbbas=",