458 lines
14 KiB
Go
458 lines
14 KiB
Go
// Copyright 2015 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 local
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path"
|
|
"strings"
|
|
"sync/atomic"
|
|
|
|
"github.com/golang/glog"
|
|
|
|
clientmodel "github.com/prometheus/client_golang/model"
|
|
|
|
"github.com/prometheus/prometheus/storage/local/codable"
|
|
"github.com/prometheus/prometheus/storage/local/index"
|
|
)
|
|
|
|
// recoverFromCrash is called by loadSeriesMapAndHeads if the persistence
|
|
// appears to be dirty after the loading (either because the loading resulted in
|
|
// an error or because the persistence was dirty from the start). Not goroutine
|
|
// safe. Only call before anything else is running (except index processing
|
|
// queue as started by newPersistence).
|
|
func (p *persistence) recoverFromCrash(fingerprintToSeries map[clientmodel.Fingerprint]*memorySeries) error {
|
|
// TODO(beorn): We need proper tests for the crash recovery.
|
|
glog.Warning("Starting crash recovery. Prometheus is inoperational until complete.")
|
|
|
|
fpsSeen := map[clientmodel.Fingerprint]struct{}{}
|
|
count := 0
|
|
seriesDirNameFmt := fmt.Sprintf("%%0%dx", seriesDirNameLen)
|
|
|
|
glog.Info("Scanning files.")
|
|
for i := 0; i < 1<<(seriesDirNameLen*4); i++ {
|
|
dirname := path.Join(p.basePath, fmt.Sprintf(seriesDirNameFmt, i))
|
|
dir, err := os.Open(dirname)
|
|
if os.IsNotExist(err) {
|
|
continue
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer dir.Close()
|
|
for fis := []os.FileInfo{}; err != io.EOF; fis, err = dir.Readdir(1024) {
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, fi := range fis {
|
|
fp, ok := p.sanitizeSeries(dirname, fi, fingerprintToSeries)
|
|
if ok {
|
|
fpsSeen[fp] = struct{}{}
|
|
}
|
|
count++
|
|
if count%10000 == 0 {
|
|
glog.Infof("%d files scanned.", count)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
glog.Infof("File scan complete. %d series found.", len(fpsSeen))
|
|
|
|
glog.Info("Checking for series without series file.")
|
|
for fp, s := range fingerprintToSeries {
|
|
if _, seen := fpsSeen[fp]; !seen {
|
|
// fp exists in fingerprintToSeries, but has no representation on disk.
|
|
if s.headChunkClosed {
|
|
// Oops, everything including the head chunk was
|
|
// already persisted, but nothing on disk.
|
|
// Thus, we lost that series completely. Clean
|
|
// up the remnants.
|
|
delete(fingerprintToSeries, fp)
|
|
if err := p.purgeArchivedMetric(fp); err != nil {
|
|
// Purging the archived metric didn't work, so try
|
|
// to unindex it, just in case it's in the indexes.
|
|
p.unindexMetric(fp, s.metric)
|
|
}
|
|
glog.Warningf("Lost series detected: fingerprint %v, metric %v.", fp, s.metric)
|
|
continue
|
|
}
|
|
// If we are here, the only chunks we have are the chunks in the checkpoint.
|
|
// Adjust things accordingly.
|
|
if s.persistWatermark > 0 || s.chunkDescsOffset != 0 {
|
|
minLostChunks := s.persistWatermark + s.chunkDescsOffset
|
|
if minLostChunks <= 0 {
|
|
glog.Warningf(
|
|
"Possible loss of chunks for fingerprint %v, metric %v.",
|
|
fp, s.metric,
|
|
)
|
|
} else {
|
|
glog.Warningf(
|
|
"Lost at least %d chunks for fingerprint %v, metric %v.",
|
|
minLostChunks, fp, s.metric,
|
|
)
|
|
}
|
|
s.chunkDescs = append(
|
|
make([]*chunkDesc, 0, len(s.chunkDescs)-s.persistWatermark),
|
|
s.chunkDescs[s.persistWatermark:]...,
|
|
)
|
|
numMemChunkDescs.Sub(float64(s.persistWatermark))
|
|
s.persistWatermark = 0
|
|
s.chunkDescsOffset = 0
|
|
}
|
|
fpsSeen[fp] = struct{}{} // Add so that fpsSeen is complete.
|
|
}
|
|
}
|
|
glog.Info("Check for series without series file complete.")
|
|
|
|
if err := p.cleanUpArchiveIndexes(fingerprintToSeries, fpsSeen); err != nil {
|
|
return err
|
|
}
|
|
if err := p.rebuildLabelIndexes(fingerprintToSeries); err != nil {
|
|
return err
|
|
}
|
|
|
|
p.setDirty(false)
|
|
glog.Warning("Crash recovery complete.")
|
|
return nil
|
|
}
|
|
|
|
// sanitizeSeries sanitizes a series based on its series file as defined by the
|
|
// provided directory and FileInfo. The method returns the fingerprint as
|
|
// derived from the directory and file name, and whether the provided file has
|
|
// been sanitized. A file that failed to be sanitized is moved into the
|
|
// "orphaned" sub-directory, if possible.
|
|
//
|
|
// The following steps are performed:
|
|
//
|
|
// - A file whose name doesn't comply with the naming scheme of a series file is
|
|
// simply moved into the orphaned directory.
|
|
//
|
|
// - If the size of the series file isn't a multiple of the chunk size,
|
|
// extraneous bytes are truncated. If the truncation fails, the file is
|
|
// moved into the orphaned directory.
|
|
//
|
|
// - A file that is empty (after truncation) is deleted.
|
|
//
|
|
// - A series that is not archived (i.e. it is in the fingerprintToSeries map)
|
|
// is checked for consistency of its various parameters (like persist
|
|
// watermark, offset of chunkDescs etc.). In particular, overlap between an
|
|
// in-memory head chunk with the most recent persisted chunk is
|
|
// checked. Inconsistencies are rectified.
|
|
//
|
|
// - A series that is archived (i.e. it is not in the fingerprintToSeries map)
|
|
// is checked for its presence in the index of archived series. If it cannot
|
|
// be found there, it is moved into the orphaned directory.
|
|
func (p *persistence) sanitizeSeries(
|
|
dirname string, fi os.FileInfo, fingerprintToSeries map[clientmodel.Fingerprint]*memorySeries,
|
|
) (clientmodel.Fingerprint, bool) {
|
|
filename := path.Join(dirname, fi.Name())
|
|
purge := func() {
|
|
var err error
|
|
defer func() {
|
|
if err != nil {
|
|
glog.Errorf("Failed to move lost series file %s to orphaned directory, deleting it instead. Error was: %s", filename, err)
|
|
if err = os.Remove(filename); err != nil {
|
|
glog.Errorf("Even deleting file %s did not work: %s", filename, err)
|
|
}
|
|
}
|
|
}()
|
|
orphanedDir := path.Join(p.basePath, "orphaned", path.Base(dirname))
|
|
if err = os.MkdirAll(orphanedDir, 0700); err != nil {
|
|
return
|
|
}
|
|
if err = os.Rename(filename, path.Join(orphanedDir, fi.Name())); err != nil {
|
|
return
|
|
}
|
|
}
|
|
|
|
var fp clientmodel.Fingerprint
|
|
if len(fi.Name()) != fpLen-seriesDirNameLen+len(seriesFileSuffix) ||
|
|
!strings.HasSuffix(fi.Name(), seriesFileSuffix) {
|
|
glog.Warningf("Unexpected series file name %s.", filename)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
if err := fp.LoadFromString(path.Base(dirname) + fi.Name()[:fpLen-seriesDirNameLen]); err != nil {
|
|
glog.Warningf("Error parsing file name %s: %s", filename, err)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
|
|
bytesToTrim := fi.Size() % int64(chunkLenWithHeader)
|
|
chunksInFile := int(fi.Size()) / chunkLenWithHeader
|
|
modTime := fi.ModTime()
|
|
if bytesToTrim != 0 {
|
|
glog.Warningf(
|
|
"Truncating file %s to exactly %d chunks, trimming %d extraneous bytes.",
|
|
filename, chunksInFile, bytesToTrim,
|
|
)
|
|
f, err := os.OpenFile(filename, os.O_WRONLY, 0640)
|
|
if err != nil {
|
|
glog.Errorf("Could not open file %s: %s", filename, err)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
if err := f.Truncate(fi.Size() - bytesToTrim); err != nil {
|
|
glog.Errorf("Failed to truncate file %s: %s", filename, err)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
}
|
|
if chunksInFile == 0 {
|
|
glog.Warningf("No chunks left in file %s.", filename)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
|
|
s, ok := fingerprintToSeries[fp]
|
|
if ok { // This series is supposed to not be archived.
|
|
if s == nil {
|
|
panic("fingerprint mapped to nil pointer")
|
|
}
|
|
if !p.pedanticChecks &&
|
|
bytesToTrim == 0 &&
|
|
s.chunkDescsOffset != -1 &&
|
|
chunksInFile == s.chunkDescsOffset+s.persistWatermark &&
|
|
modTime.Equal(s.modTime) {
|
|
// Everything is consistent. We are good.
|
|
return fp, true
|
|
}
|
|
// If we are here, we cannot be sure the series file is
|
|
// consistent with the checkpoint, so we have to take a closer
|
|
// look.
|
|
if s.headChunkClosed {
|
|
// This is the easy case as we don't have any chunks in
|
|
// heads.db. Treat this series as a freshly unarchived
|
|
// one. No chunks or chunkDescs in memory, no current
|
|
// head chunk.
|
|
glog.Warningf(
|
|
"Treating recovered metric %v, fingerprint %v, as freshly unarchived, with %d chunks in series file.",
|
|
s.metric, fp, chunksInFile,
|
|
)
|
|
s.chunkDescs = nil
|
|
s.chunkDescsOffset = chunksInFile
|
|
s.persistWatermark = 0
|
|
s.modTime = modTime
|
|
return fp, true
|
|
}
|
|
// This is the tricky one: We have chunks from heads.db, but
|
|
// some of those chunks might already be in the series
|
|
// file. Strategy: Take the last time of the most recent chunk
|
|
// in the series file. Then find the oldest chunk among those
|
|
// from heads.db that has a first time later or equal to the
|
|
// last time from the series file. Throw away the older chunks
|
|
// from heads.db and stitch the parts together.
|
|
|
|
// First, throw away the chunkDescs without chunks.
|
|
s.chunkDescs = s.chunkDescs[s.persistWatermark:]
|
|
numMemChunkDescs.Sub(float64(s.persistWatermark))
|
|
// Load all the chunk descs (which assumes we have none from the future).
|
|
cds, err := p.loadChunkDescs(fp, clientmodel.Now())
|
|
if err != nil {
|
|
glog.Errorf(
|
|
"Failed to load chunk descriptors for metric %v, fingerprint %v: %s",
|
|
s.metric, fp, err,
|
|
)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
s.persistWatermark = len(cds)
|
|
s.chunkDescsOffset = 0
|
|
s.modTime = modTime
|
|
|
|
lastTime := cds[len(cds)-1].lastTime()
|
|
keepIdx := -1
|
|
for i, cd := range s.chunkDescs {
|
|
if cd.firstTime() >= lastTime {
|
|
keepIdx = i
|
|
break
|
|
}
|
|
}
|
|
if keepIdx == -1 {
|
|
glog.Warningf(
|
|
"Recovered metric %v, fingerprint %v: all %d chunks recovered from series file.",
|
|
s.metric, fp, chunksInFile,
|
|
)
|
|
numMemChunkDescs.Sub(float64(len(s.chunkDescs)))
|
|
atomic.AddInt64(&numMemChunks, int64(-len(s.chunkDescs)))
|
|
s.chunkDescs = cds
|
|
s.headChunkClosed = true
|
|
return fp, true
|
|
}
|
|
glog.Warningf(
|
|
"Recovered metric %v, fingerprint %v: recovered %d chunks from series file, recovered %d chunks from checkpoint.",
|
|
s.metric, fp, chunksInFile, len(s.chunkDescs)-keepIdx,
|
|
)
|
|
numMemChunkDescs.Sub(float64(keepIdx))
|
|
atomic.AddInt64(&numMemChunks, int64(-keepIdx))
|
|
s.chunkDescs = append(cds, s.chunkDescs[keepIdx:]...)
|
|
return fp, true
|
|
}
|
|
// This series is supposed to be archived.
|
|
metric, err := p.getArchivedMetric(fp)
|
|
if err != nil {
|
|
glog.Errorf(
|
|
"Fingerprint %v assumed archived but couldn't be looked up in archived index: %s",
|
|
fp, err,
|
|
)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
if metric == nil {
|
|
glog.Warningf(
|
|
"Fingerprint %v assumed archived but couldn't be found in archived index.",
|
|
fp,
|
|
)
|
|
purge()
|
|
return fp, false
|
|
}
|
|
// This series looks like a properly archived one.
|
|
return fp, true
|
|
}
|
|
|
|
func (p *persistence) cleanUpArchiveIndexes(
|
|
fpToSeries map[clientmodel.Fingerprint]*memorySeries,
|
|
fpsSeen map[clientmodel.Fingerprint]struct{},
|
|
) error {
|
|
glog.Info("Cleaning up archive indexes.")
|
|
var fp codable.Fingerprint
|
|
var m codable.Metric
|
|
count := 0
|
|
if err := p.archivedFingerprintToMetrics.ForEach(func(kv index.KeyValueAccessor) error {
|
|
count++
|
|
if count%10000 == 0 {
|
|
glog.Infof("%d archived metrics checked.", count)
|
|
}
|
|
if err := kv.Key(&fp); err != nil {
|
|
return err
|
|
}
|
|
_, fpSeen := fpsSeen[clientmodel.Fingerprint(fp)]
|
|
inMemory := false
|
|
if fpSeen {
|
|
_, inMemory = fpToSeries[clientmodel.Fingerprint(fp)]
|
|
}
|
|
if !fpSeen || inMemory {
|
|
if inMemory {
|
|
glog.Warningf("Archive clean-up: Fingerprint %v is not archived. Purging from archive indexes.", clientmodel.Fingerprint(fp))
|
|
}
|
|
if !fpSeen {
|
|
glog.Warningf("Archive clean-up: Fingerprint %v is unknown. Purging from archive indexes.", clientmodel.Fingerprint(fp))
|
|
}
|
|
// It's fine if the fp is not in the archive indexes.
|
|
if _, err := p.archivedFingerprintToMetrics.Delete(fp); err != nil {
|
|
return err
|
|
}
|
|
// Delete from timerange index, too.
|
|
_, err := p.archivedFingerprintToTimeRange.Delete(fp)
|
|
return err
|
|
}
|
|
// fp is legitimately archived. Make sure it is in timerange index, too.
|
|
has, err := p.archivedFingerprintToTimeRange.Has(fp)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if has {
|
|
return nil // All good.
|
|
}
|
|
glog.Warningf("Archive clean-up: Fingerprint %v is not in time-range index. Unarchiving it for recovery.")
|
|
// Again, it's fine if fp is not in the archive index.
|
|
if _, err := p.archivedFingerprintToMetrics.Delete(fp); err != nil {
|
|
return err
|
|
}
|
|
if err := kv.Value(&m); err != nil {
|
|
return err
|
|
}
|
|
series := newMemorySeries(clientmodel.Metric(m), false, clientmodel.Earliest)
|
|
cds, err := p.loadChunkDescs(clientmodel.Fingerprint(fp), clientmodel.Now())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
series.chunkDescs = cds
|
|
series.chunkDescsOffset = 0
|
|
series.persistWatermark = len(cds)
|
|
fpToSeries[clientmodel.Fingerprint(fp)] = series
|
|
return nil
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
count = 0
|
|
if err := p.archivedFingerprintToTimeRange.ForEach(func(kv index.KeyValueAccessor) error {
|
|
count++
|
|
if count%10000 == 0 {
|
|
glog.Infof("%d archived time ranges checked.", count)
|
|
}
|
|
if err := kv.Key(&fp); err != nil {
|
|
return err
|
|
}
|
|
has, err := p.archivedFingerprintToMetrics.Has(fp)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if has {
|
|
return nil // All good.
|
|
}
|
|
glog.Warningf("Archive clean-up: Purging unknown fingerprint %v in time-range index.", fp)
|
|
deleted, err := p.archivedFingerprintToTimeRange.Delete(fp)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !deleted {
|
|
glog.Errorf("Fingerprint %v to be deleted from archivedFingerprintToTimeRange not found. This should never happen.", fp)
|
|
}
|
|
return nil
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
glog.Info("Clean-up of archive indexes complete.")
|
|
return nil
|
|
}
|
|
|
|
func (p *persistence) rebuildLabelIndexes(
|
|
fpToSeries map[clientmodel.Fingerprint]*memorySeries,
|
|
) error {
|
|
count := 0
|
|
glog.Info("Rebuilding label indexes.")
|
|
glog.Info("Indexing metrics in memory.")
|
|
for fp, s := range fpToSeries {
|
|
p.indexMetric(fp, s.metric)
|
|
count++
|
|
if count%10000 == 0 {
|
|
glog.Infof("%d metrics queued for indexing.", count)
|
|
}
|
|
}
|
|
glog.Info("Indexing archived metrics.")
|
|
var fp codable.Fingerprint
|
|
var m codable.Metric
|
|
if err := p.archivedFingerprintToMetrics.ForEach(func(kv index.KeyValueAccessor) error {
|
|
if err := kv.Key(&fp); err != nil {
|
|
return err
|
|
}
|
|
if err := kv.Value(&m); err != nil {
|
|
return err
|
|
}
|
|
p.indexMetric(clientmodel.Fingerprint(fp), clientmodel.Metric(m))
|
|
count++
|
|
if count%10000 == 0 {
|
|
glog.Infof("%d metrics queued for indexing.", count)
|
|
}
|
|
return nil
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
glog.Info("All requests for rebuilding the label indexes queued. (Actual processing may lag behind.)")
|
|
return nil
|
|
}
|