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Remove time based m-map file creation (#7314)

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* Remove time based m-map file creation

Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Fix review comments

Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>
This commit is contained in:
Ganesh Vernekar 2020-05-29 20:08:41 +05:30 committed by GitHub
parent c7d9516695
commit a1355eb7c7
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 101 additions and 101 deletions
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49
tsdb/chunks/head_chunks.go
View file

@ -26,7 +26,6 @@ import (
"strconv"
"sync"
"sync/atomic"
"time"
"github.com/pkg/errors"
"github.com/prometheus/prometheus/tsdb/chunkenc"
@ -50,12 +49,6 @@ var (
)
const (
// DefaultHeadChunkFileMaxTimeRange is the default head chunk file time range.
// Assuming a general scrape interval of 15s, a chunk with 120 samples would
// be cut every 30m, so anything <30m will cause lots of empty files. And keeping
// it exactly 30m also has a chance of having empty files as its near that border.
// Hence keeping it a little more than 30m, i.e. 40m.
DefaultHeadChunkFileMaxTimeRange = 40 * int64(time.Minute/time.Millisecond)
// MintMaxtSize is the size of the mint/maxt for head chunk file and chunks.
MintMaxtSize = 8
// SeriesRefSize is the size of series reference on disk.
@ -63,7 +56,7 @@ const (
// HeadChunkFileHeaderSize is the total size of the header for the head chunk file.
HeadChunkFileHeaderSize = SegmentHeaderSize
// MaxHeadChunkFileSize is the max size of a head chunk file.
MaxHeadChunkFileSize = 512 * 1024 * 1024 // 512 MiB.
MaxHeadChunkFileSize = 128 * 1024 * 1024 // 128 MiB.
// CRCSize is the size of crc32 sum on disk.
CRCSize = 4
// MaxHeadChunkMetaSize is the max size of an mmapped chunks minus the chunks data.
@ -90,15 +83,13 @@ type ChunkDiskMapper struct {
curFile *os.File // File being written to.
curFileSequence int // Index of current open file being appended to.
curFileMint int64 // Used to check for a chunk crossing the max file time range.
curFileMaxt int64 // Used for the size retention.
curFileNumBytes int64 // Bytes written in current open file.
maxFileTime int64 // Max time range (curFileMaxt-curFileMint) for a file.
byteBuf [MaxHeadChunkMetaSize]byte // Buffer used to write the header of the chunk.
chkWriter *bufio.Writer // Writer for the current open file.
crc32 hash.Hash
writePathMtx sync.RWMutex
writePathMtx sync.Mutex
/// Reader.
// The int key in the map is the file number on the disk.
@ -133,14 +124,6 @@ type mmappedChunkFile struct {
// NOTE: 'IterateAllChunks' method needs to be called at least once after creating ChunkDiskMapper
// to set the maxt of all the file.
func NewChunkDiskMapper(dir string, pool chunkenc.Pool) (*ChunkDiskMapper, error) {
return newChunkDiskMapper(dir, DefaultHeadChunkFileMaxTimeRange, pool)
}
func newChunkDiskMapper(dir string, maxFileDuration int64, pool chunkenc.Pool) (*ChunkDiskMapper, error) {
if maxFileDuration <= 0 {
maxFileDuration = DefaultHeadChunkFileMaxTimeRange
}
if err := os.MkdirAll(dir, 0777); err != nil {
return nil, err
}
@ -151,7 +134,6 @@ func newChunkDiskMapper(dir string, maxFileDuration int64, pool chunkenc.Pool) (
m := &ChunkDiskMapper{
dir: dirFile,
maxFileTime: maxFileDuration,
pool: pool,
crc32: newCRC32(),
chunkBuffer: newChunkBuffer(),
@ -256,8 +238,8 @@ func (cdm *ChunkDiskMapper) WriteChunk(seriesRef uint64, mint, maxt int64, chk c
return 0, ErrChunkDiskMapperClosed
}
if cdm.shouldCutNewFile(len(chk.Bytes()), maxt) {
if err := cdm.cut(mint); err != nil {
if cdm.shouldCutNewFile(len(chk.Bytes())) {
if err := cdm.cut(); err != nil {
return 0, err
}
}
@ -301,9 +283,6 @@ func (cdm *ChunkDiskMapper) WriteChunk(seriesRef uint64, mint, maxt int64, chk c
if maxt > cdm.curFileMaxt {
cdm.curFileMaxt = maxt
}
if mint < cdm.curFileMint {
cdm.curFileMint = mint
}
cdm.chunkBuffer.put(chkRef, chk)
@ -325,13 +304,21 @@ func chunkRef(seq, offset uint64) (chunkRef uint64) {
// shouldCutNewFile decides the cutting of a new file based on time and size retention.
// Size retention: because depending on the system architecture, there is a limit on how big of a file we can m-map.
// Time retention: so that we can delete old chunks with some time guarantee in low load environments.
func (cdm *ChunkDiskMapper) shouldCutNewFile(chunkSize int, maxt int64) bool {
func (cdm *ChunkDiskMapper) shouldCutNewFile(chunkSize int) bool {
return cdm.curFileNumBytes == 0 || // First head chunk file.
(maxt-cdm.curFileMint > cdm.maxFileTime && cdm.curFileNumBytes > HeadChunkFileHeaderSize) || // Time duration reached for the existing file.
cdm.curFileNumBytes+int64(chunkSize+MaxHeadChunkMetaSize) > MaxHeadChunkFileSize // Exceeds the max head chunk file size.
}
func (cdm *ChunkDiskMapper) cut(mint int64) (returnErr error) {
// CutNewFile creates a new m-mapped file.
func (cdm *ChunkDiskMapper) CutNewFile() (returnErr error) {
cdm.writePathMtx.Lock()
defer cdm.writePathMtx.Unlock()
return cdm.cut()
}
// cut creates a new m-mapped file. The write lock should be held before calling this.
func (cdm *ChunkDiskMapper) cut() (returnErr error) {
// Sync current tail to disk and close.
if err := cdm.finalizeCurFile(); err != nil {
return err
@ -367,7 +354,6 @@ func (cdm *ChunkDiskMapper) cut(mint int64) (returnErr error) {
}
cdm.curFileSequence = seq
cdm.curFileMint = mint
cdm.curFile = newFile
if cdm.chkWriter != nil {
cdm.chkWriter.Reset(newFile)
@ -690,7 +676,10 @@ func (cdm *ChunkDiskMapper) Truncate(mint int64) error {
}
cdm.readPathMtx.RUnlock()
return cdm.deleteFiles(removedFiles)
var merr tsdb_errors.MultiError
merr.Add(cdm.CutNewFile())
merr.Add(cdm.deleteFiles(removedFiles))
return merr.Err()
}
func (cdm *ChunkDiskMapper) deleteFiles(removedFiles []int) error {

58
tsdb/chunks/head_chunks_test.go
View file

@ -19,7 +19,6 @@ import (
"math/rand"
"os"
"testing"
"time"
"github.com/prometheus/prometheus/tsdb/chunkenc"
"github.com/prometheus/prometheus/util/testutil"
@ -48,7 +47,8 @@ func TestHeadReadWriter_WriteChunk_Chunk_IterateChunks(t *testing.T) {
totalChunks := 0
var firstFileName string
for hrw.curFileSequence < 3 || hrw.chkWriter.Buffered() == 0 {
for i := 0; i < 100; i++ {
addChunks := func(numChunks int) {
for i := 0; i < numChunks; i++ {
seriesRef, chkRef, mint, maxt, chunk := createChunk(t, totalChunks, hrw)
totalChunks++
expectedData = append(expectedData, expectedDataType{
@ -96,6 +96,10 @@ func TestHeadReadWriter_WriteChunk_Chunk_IterateChunks(t *testing.T) {
nextChunkOffset += SeriesRefSize + 2*MintMaxtSize + ChunkEncodingSize + uint64(n) + uint64(len(chunk.Bytes())) + CRCSize
}
}
addChunks(100)
hrw.CutNewFile()
addChunks(10) // For chunks in in-memory buffer.
}
// Checking on-disk bytes for the first file.
testutil.Assert(t, len(hrw.mmappedChunkFiles) == 3 && len(hrw.closers) == 3, "expected 3 mmapped files, got %d", len(hrw.mmappedChunkFiles))
@ -165,12 +169,12 @@ func TestHeadReadWriter_Truncate(t *testing.T) {
timeRange := 0
fileTimeStep := 100
totalFiles, after1stTruncation, after2ndTruncation := 7, 5, 3
totalFiles := 7
startIndexAfter1stTruncation, startIndexAfter2ndTruncation := 3, 6
filesDeletedAfter1stTruncation, filesDeletedAfter2ndTruncation := 2, 5
var timeToTruncate, timeToTruncateAfterRestart int64
cutFile := func(i int) {
testutil.Ok(t, hrw.cut(int64(timeRange)))
addChunk := func() int {
mint := timeRange + 1 // Just after the the new file cut.
maxt := timeRange + fileTimeStep - 1 // Just before the next file.
@ -178,15 +182,21 @@ func TestHeadReadWriter_Truncate(t *testing.T) {
_, err := hrw.WriteChunk(1, int64(mint), int64(maxt), randomChunk(t))
testutil.Ok(t, err)
if i == totalFiles-after1stTruncation+1 {
// Truncate the segment files before the 5th segment.
timeToTruncate = int64(mint)
} else if i == totalFiles-after2ndTruncation+1 {
// Truncate the segment files before the 3rd segment after restart.
timeToTruncateAfterRestart = int64(mint)
timeRange += fileTimeStep
return mint
}
timeRange += fileTimeStep
cutFile := func(i int) {
testutil.Ok(t, hrw.CutNewFile())
mint := addChunk()
if i == startIndexAfter1stTruncation {
timeToTruncate = int64(mint)
} else if i == startIndexAfter2ndTruncation {
timeToTruncateAfterRestart = int64(mint)
}
}
// Cut segments.
@ -195,8 +205,8 @@ func TestHeadReadWriter_Truncate(t *testing.T) {
}
// Verifying the the remaining files.
verifyRemainingFiles := func(remainingFiles int) {
t.Helper()
verifyRemainingFiles := func(remainingFiles, startIndex int) {
//t.Helper()
files, err := ioutil.ReadDir(hrw.dir.Name())
testutil.Ok(t, err)
@ -206,7 +216,7 @@ func TestHeadReadWriter_Truncate(t *testing.T) {
for i := 1; i <= totalFiles; i++ {
_, ok := hrw.mmappedChunkFiles[i]
if i < totalFiles-remainingFiles+1 {
if i < startIndex {
testutil.Equals(t, false, ok)
} else {
testutil.Equals(t, true, ok)
@ -215,11 +225,13 @@ func TestHeadReadWriter_Truncate(t *testing.T) {
}
// Verify the number of segments.
verifyRemainingFiles(totalFiles)
verifyRemainingFiles(totalFiles, 1)
// Truncating files.
testutil.Ok(t, hrw.Truncate(timeToTruncate))
verifyRemainingFiles(after1stTruncation)
totalFiles++ // Truncation creates a new file.
verifyRemainingFiles(totalFiles-filesDeletedAfter1stTruncation, startIndexAfter1stTruncation)
addChunk() // Add a chunk so that new file is not truncated.
dir := hrw.dir.Name()
testutil.Ok(t, hrw.Close())
@ -235,14 +247,12 @@ func TestHeadReadWriter_Truncate(t *testing.T) {
// Truncating files after restart.
testutil.Ok(t, hrw.Truncate(timeToTruncateAfterRestart))
verifyRemainingFiles(after2ndTruncation)
totalFiles++ // Truncation creates a new file.
verifyRemainingFiles(totalFiles-filesDeletedAfter2ndTruncation, startIndexAfter2ndTruncation)
// Add another file to have an active file.
totalFiles++
cutFile(totalFiles)
// Truncating till current time should not delete the current active file.
testutil.Ok(t, hrw.Truncate(time.Now().UnixNano()/1e6))
verifyRemainingFiles(1)
testutil.Ok(t, hrw.Truncate(int64(timeRange+fileTimeStep)))
verifyRemainingFiles(2, totalFiles) // One file was the active file and one was newly created.
}
func testHeadReadWriter(t *testing.T) (hrw *ChunkDiskMapper, close func()) {

11
tsdb/head_test.go
View file

@ -1300,7 +1300,7 @@ func TestHeadReadWriterRepair(t *testing.T) {
testutil.Ok(t, os.RemoveAll(dir))
}()
const chunkRange = chunks.DefaultHeadChunkFileMaxTimeRange // to hold 4 chunks per segment.
const chunkRange = 1000
walDir := filepath.Join(dir, "wal")
// Fill the chunk segments and corrupt it.
@ -1317,19 +1317,20 @@ func TestHeadReadWriterRepair(t *testing.T) {
testutil.Assert(t, created, "series was not created")
for i := 0; i < 7; i++ {
ok, chunkCreated := s.append(int64(i*int(chunkRange)), float64(i*int(chunkRange)), 0, h.chunkDiskMapper)
ok, chunkCreated := s.append(int64(i*chunkRange), float64(i*chunkRange), 0, h.chunkDiskMapper)
testutil.Assert(t, ok, "series append failed")
testutil.Assert(t, chunkCreated, "chunk was not created")
ok, chunkCreated = s.append(int64(i*int(chunkRange))+chunkRange-1, float64(i*int(chunkRange)), 0, h.chunkDiskMapper)
ok, chunkCreated = s.append(int64(i*chunkRange)+chunkRange-1, float64(i*chunkRange), 0, h.chunkDiskMapper)
testutil.Assert(t, ok, "series append failed")
testutil.Assert(t, !chunkCreated, "chunk was created")
testutil.Ok(t, h.chunkDiskMapper.CutNewFile())
}
testutil.Ok(t, h.Close())
// Verify that there are 6 segment files.
// Verify that there are 7 segment files.
files, err := ioutil.ReadDir(mmappedChunksDir(dir))
testutil.Ok(t, err)
testutil.Equals(t, 6, len(files))
testutil.Equals(t, 7, len(files))
// Corrupt the 4th file by writing a random byte to series ref.
f, err := os.OpenFile(filepath.Join(mmappedChunksDir(dir), files[3].Name()), os.O_WRONLY, 0666)