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Fix the embarrassing bug introduced in commit 0851945. 

In that commit, the 'maintainSeries' call was accidentally removed.

This commit refactors things a bit so that there is now a clean
'maintainMemorySeries' and a 'maintainArchivedSeries' call.

Straighten the nomenclature a bit (consistently use 'drop' for
chunks and 'purge' for series/metrics).

Remove the annoying 'Completed maintenance sweep through archived
fingerprints' message if there were no archived fingerprints to do
maintenance on.
This commit is contained in:
beorn7 2015-02-26 15:19:44 +01:00
parent 041aa59623
commit edd716e63c
7 changed files with 127 additions and 85 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
storage/local/crashrecovery.go
View File

@ -78,8 +78,8 @@ func (p *persistence) recoverFromCrash(fingerprintToSeries map[clientmodel.Finge
// Oops, head chunk was persisted, but nothing on disk.
// Thus, we lost that series completely. Clean up the remnants.
delete(fingerprintToSeries, fp)
if err := p.dropArchivedMetric(fp); err != nil {
// Dropping the archived metric didn't work, so try
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)
}

2
storage/local/instrumentation.go
View File

@ -67,7 +67,7 @@ const (
unpin = "unpin" // Excluding the unpin on persisting.
clone = "clone"
transcode = "transcode"
purge = "purge"
drop = "drop"
// Op-types for chunkOps and chunkDescOps.
evict = "evict"

16
storage/local/persistence.go
View File

@ -771,7 +771,7 @@ func (p *persistence) dropChunks(fp clientmodel.Fingerprint, beforeTime clientmo
if err == io.EOF {
// We ran into the end of the file without finding any chunks that should
// be kept. Remove the whole file.
chunkOps.WithLabelValues(purge).Add(float64(i))
chunkOps.WithLabelValues(drop).Add(float64(i))
if err := os.Remove(f.Name()); err != nil {
return 0, 0, true, err
}
@ -783,7 +783,7 @@ func (p *persistence) dropChunks(fp clientmodel.Fingerprint, beforeTime clientmo
lastTime := clientmodel.Timestamp(binary.LittleEndian.Uint64(timeBuf[8:]))
if !lastTime.Before(beforeTime) {
firstTime = clientmodel.Timestamp(binary.LittleEndian.Uint64(timeBuf))
chunkOps.WithLabelValues(purge).Add(float64(i))
chunkOps.WithLabelValues(drop).Add(float64(i))
break
}
}
@ -824,7 +824,7 @@ func (p *persistence) indexMetric(fp clientmodel.Fingerprint, m clientmodel.Metr
// indexes used for getFingerprintsForLabelPair, getLabelValuesForLabelName, and
// getFingerprintsModifiedBefore. The index of fingerprints to archived metrics
// is not affected by this removal. (In fact, never call this method for an
// archived metric. To drop an archived metric, call dropArchivedFingerprint.)
// archived metric. To purge an archived metric, call purgeArchivedFingerprint.)
// If the queue is full, this method blocks until the metric can be queued. This
// method is goroutine-safe.
func (p *persistence) unindexMetric(fp clientmodel.Fingerprint, m clientmodel.Metric) {
@ -910,11 +910,11 @@ func (p *persistence) getArchivedMetric(fp clientmodel.Fingerprint) (clientmodel
return metric, err
}
// dropArchivedMetric deletes an archived fingerprint and its corresponding
// purgeArchivedMetric deletes an archived fingerprint and its corresponding
// metric entirely. It also queues the metric for un-indexing (no need to call
// unindexMetric for the deleted metric.) The caller must have locked the
// fingerprint.
func (p *persistence) dropArchivedMetric(fp clientmodel.Fingerprint) (err error) {
// unindexMetric for the deleted metric.) It does not touch the series file,
// though. The caller must have locked the fingerprint.
func (p *persistence) purgeArchivedMetric(fp clientmodel.Fingerprint) (err error) {
defer func() {
if err != nil {
p.setDirty(true)
@ -944,7 +944,7 @@ func (p *persistence) dropArchivedMetric(fp clientmodel.Fingerprint) (err error)
}
// unarchiveMetric deletes an archived fingerprint and its metric, but (in
// contrast to dropArchivedMetric) does not un-index the metric. If a metric
// contrast to purgeArchivedMetric) does not un-index the metric. If a metric
// was actually deleted, the method returns true and the first time of the
// deleted metric. The caller must have locked the fingerprint.
func (p *persistence) unarchiveMetric(fp clientmodel.Fingerprint) (

6
storage/local/persistence_test.go
View File

@ -349,11 +349,11 @@ func TestDropArchivedMetric(t *testing.T) {
t.Error("want FP 2 archived")
}
if err != p.dropArchivedMetric(1) {
if err != p.purgeArchivedMetric(1) {
t.Fatal(err)
}
if err != p.dropArchivedMetric(3) {
// Dropping something that has not beet archived is not an error.
if err != p.purgeArchivedMetric(3) {
// Purging something that has not beet archived is not an error.
t.Fatal(err)
}
p.waitForIndexing()

6
storage/local/series.go
View File

@ -242,11 +242,11 @@ func (s *memorySeries) evictChunkDescs(iOldestNotEvicted int) {
}
}
// purgeOlderThan removes chunkDescs older than t. It returns the number of
// purged chunkDescs and true if all chunkDescs have been purged.
// dropChunks removes chunkDescs older than t. It returns the number of dropped
// chunkDescs and true if all chunkDescs have been dropped.
//
// The caller must have locked the fingerprint of the series.
func (s *memorySeries) purgeOlderThan(t clientmodel.Timestamp) (int, bool) {
func (s *memorySeries) dropChunks(t clientmodel.Timestamp) (int, bool) {
keepIdx := len(s.chunkDescs)
for i, cd := range s.chunkDescs {
if !cd.lastTime().Before(t) {

143
storage/local/storage.go
View File

@ -68,7 +68,7 @@ type memorySeriesStorage struct {
loopStopping, loopStopped chan struct{}
maxMemoryChunks int
purgeAfter time.Duration
dropAfter time.Duration
checkpointInterval time.Duration
checkpointDirtySeriesLimit int
@ -96,7 +96,6 @@ type memorySeriesStorage struct {
seriesOps *prometheus.CounterVec
ingestedSamplesCount prometheus.Counter
invalidPreloadRequestsCount prometheus.Counter
purgeDuration prometheus.Gauge
}
// MemorySeriesStorageOptions contains options needed by
@ -105,7 +104,7 @@ type memorySeriesStorage struct {
type MemorySeriesStorageOptions struct {
MemoryChunks int // How many chunks to keep in memory.
PersistenceStoragePath string // Location of persistence files.
PersistenceRetentionPeriod time.Duration // Chunks at least that old are purged.
PersistenceRetentionPeriod time.Duration // Chunks at least that old are dropped.
PersistenceQueueCapacity int // Capacity of queue for chunks to be persisted.
CheckpointInterval time.Duration // How often to checkpoint the series map and head chunks.
CheckpointDirtySeriesLimit int // How many dirty series will trigger an early checkpoint.
@ -140,7 +139,7 @@ func NewMemorySeriesStorage(o *MemorySeriesStorageOptions) (Storage, error) {
loopStopping: make(chan struct{}),
loopStopped: make(chan struct{}),
maxMemoryChunks: o.MemoryChunks,
purgeAfter: o.PersistenceRetentionPeriod,
dropAfter: o.PersistenceRetentionPeriod,
checkpointInterval: o.CheckpointInterval,
checkpointDirtySeriesLimit: o.CheckpointDirtySeriesLimit,
@ -670,8 +669,8 @@ func (s *memorySeriesStorage) persistChunks(fp clientmodel.Fingerprint, cds []*c
// waitForNextFP waits an estimated duration, after which we want to process
// another fingerprint so that we will process all fingerprints in a tenth of
// s.purgeAfter assuming that the system is doing nothing else, e.g. if we want
// to purge after 40h, we want to cycle through all fingerprints within
// s.dropAfter assuming that the system is doing nothing else, e.g. if we want
// to drop chunks after 40h, we want to cycle through all fingerprints within
// 4h. However, the maximum sweep time is capped at fpMaxSweepTime. Furthermore,
// this method will always wait for at least fpMinWaitDuration and never longer
// than fpMaxWaitDuration. If s.loopStopped is closed, it will return false
@ -680,7 +679,7 @@ func (s *memorySeriesStorage) persistChunks(fp clientmodel.Fingerprint, cds []*c
func (s *memorySeriesStorage) waitForNextFP(numberOfFPs int) bool {
d := fpMaxWaitDuration
if numberOfFPs != 0 {
sweepTime := s.purgeAfter / 10
sweepTime := s.dropAfter / 10
if sweepTime > fpMaxSweepTime {
sweepTime = fpMaxSweepTime
}
@ -725,6 +724,7 @@ func (s *memorySeriesStorage) cycleThroughMemoryFingerprints() chan clientmodel.
}
begin := time.Now()
fpIter = s.fpToSeries.fpIter()
count := 0
for fp := range fpIter {
select {
case memoryFingerprints <- fp:
@ -732,8 +732,14 @@ func (s *memorySeriesStorage) cycleThroughMemoryFingerprints() chan clientmodel.
return
}
s.waitForNextFP(s.fpToSeries.length())
count++
}
if count > 0 {
glog.Infof(
"Completed maintenance sweep through %d in-memory fingerprints in %v.",
count, time.Since(begin),
)
}
glog.Infof("Completed maintenance sweep through in-memory fingerprints in %v.", time.Since(begin))
}
}()
@ -750,7 +756,7 @@ func (s *memorySeriesStorage) cycleThroughArchivedFingerprints() chan clientmode
for {
archivedFPs, err := s.persistence.getFingerprintsModifiedBefore(
clientmodel.TimestampFromTime(time.Now()).Add(-1 * s.purgeAfter),
clientmodel.TimestampFromTime(time.Now()).Add(-s.dropAfter),
)
if err != nil {
glog.Error("Failed to lookup archived fingerprint ranges: ", err)
@ -770,7 +776,12 @@ func (s *memorySeriesStorage) cycleThroughArchivedFingerprints() chan clientmode
}
s.waitForNextFP(len(archivedFPs))
}
glog.Infof("Completed maintenance sweep through archived fingerprints in %v.", time.Since(begin))
if len(archivedFPs) > 0 {
glog.Infof(
"Completed maintenance sweep through %d archived fingerprints in %v.",
len(archivedFPs), time.Since(begin),
)
}
}
}()
return archivedFingerprints
@ -807,11 +818,9 @@ loop:
headChunksPersistedSinceLastCheckpoint = 0
checkpointTimer.Reset(s.checkpointInterval)
case fp := <-memoryFingerprints:
s.purgeSeries(fp, clientmodel.TimestampFromTime(time.Now()).Add(-1*s.purgeAfter))
s.seriesOps.WithLabelValues(memoryMaintenance).Inc()
s.maintainMemorySeries(fp, clientmodel.TimestampFromTime(time.Now()).Add(-s.dropAfter))
case fp := <-archivedFingerprints:
s.purgeSeries(fp, clientmodel.TimestampFromTime(time.Now()).Add(-1*s.purgeAfter))
s.seriesOps.WithLabelValues(archiveMaintenance).Inc()
s.maintainArchivedSeries(fp, clientmodel.TimestampFromTime(time.Now()).Add(-s.dropAfter))
case <-s.countPersistedHeadChunks:
headChunksPersistedSinceLastCheckpoint++
// Check if we have enough "dirty" series so that we need an early checkpoint.
@ -835,10 +844,11 @@ loop:
}
}
// maintainSeries closes the head chunk if not touched in a while. It archives a
// series if all chunks are evicted. It evicts chunkDescs if there are too
// many.
func (s *memorySeriesStorage) maintainSeries(fp clientmodel.Fingerprint) {
// maintainMemorySeries first purges the series from old chunks. If the series
// still exists after that, it proceeds with the following steps: It closes the
// head chunk if it was not touched in a while. It archives a series if all
// chunks are evicted. It evicts chunkDescs if there are too many.
func (s *memorySeriesStorage) maintainMemorySeries(fp clientmodel.Fingerprint, beforeTime clientmodel.Timestamp) {
var headChunkToPersist *chunkDesc
s.fpLocker.Lock(fp)
defer func() {
@ -846,19 +856,28 @@ func (s *memorySeriesStorage) maintainSeries(fp clientmodel.Fingerprint) {
// Queue outside of lock!
if headChunkToPersist != nil {
s.persistQueue <- persistRequest{fp, headChunkToPersist}
}
// Count that a head chunk was persisted, but only best effort, i.e. we
// don't want to block here.
select {
case s.countPersistedHeadChunks <- struct{}{}: // Counted.
default: // Meh...
// Count that a head chunk was persisted, but only best effort, i.e. we
// don't want to block here.
select {
case s.countPersistedHeadChunks <- struct{}{}: // Counted.
default: // Meh...
}
}
}()
series, ok := s.fpToSeries.get(fp)
if !ok {
// Series is actually not in memory, perhaps archived or dropped in the meantime.
return
}
defer s.seriesOps.WithLabelValues(memoryMaintenance).Inc()
if s.purgeMemorySeries(fp, series, beforeTime) {
// Series is gone now, we are done.
return
}
iOldestNotEvicted := -1
for i, cd := range series.chunkDescs {
if !cd.isEvicted() {
@ -876,7 +895,10 @@ func (s *memorySeriesStorage) maintainSeries(fp clientmodel.Fingerprint) {
if len(series.chunkDescs) == 0 {
cds, err := s.loadChunkDescs(fp, clientmodel.Latest)
if err != nil {
glog.Errorf("Could not load chunk descriptors prior to archiving metric %v, metric will not be archived: %v", series.metric, err)
glog.Errorf(
"Could not load chunk descriptors prior to archiving metric %v, metric will not be archived: %v",
series.metric, err,
)
return
}
series.chunkDescs = cds
@ -902,38 +924,43 @@ func (s *memorySeriesStorage) maintainSeries(fp clientmodel.Fingerprint) {
}
}
// purgeSeries purges chunks older than beforeTime from a series. If the series
// contains no chunks after the purge, it is dropped entirely.
func (s *memorySeriesStorage) purgeSeries(fp clientmodel.Fingerprint, beforeTime clientmodel.Timestamp) {
// purgeMemorySeries drops chunks older than beforeTime from the provided memory
// series. The caller must have locked fp. If the series contains no chunks
// after dropping old chunks, it is purged entirely. In that case, the method
// returns true.
func (s *memorySeriesStorage) purgeMemorySeries(fp clientmodel.Fingerprint, series *memorySeries, beforeTime clientmodel.Timestamp) bool {
if !series.firstTime().Before(beforeTime) {
// Oldest sample not old enough.
return false
}
newFirstTime, numDroppedFromPersistence, allDroppedFromPersistence, err := s.persistence.dropChunks(fp, beforeTime)
if err != nil {
glog.Error("Error dropping persisted chunks: ", err)
}
numDroppedFromMemory, allDroppedFromMemory := series.dropChunks(beforeTime)
if allDroppedFromPersistence && allDroppedFromMemory {
s.fpToSeries.del(fp)
s.numSeries.Dec()
s.seriesOps.WithLabelValues(memoryPurge).Inc()
s.persistence.unindexMetric(fp, series.metric)
return true
}
if series.chunkDescsOffset != -1 {
series.savedFirstTime = newFirstTime
series.chunkDescsOffset += numDroppedFromMemory - numDroppedFromPersistence
if series.chunkDescsOffset < 0 {
panic("dropped more chunks from persistence than from memory")
}
}
return false
}
// maintainArchivedSeries drops chunks older than beforeTime from an archived
// series. If the series contains no chunks after that, it is purged entirely.
func (s *memorySeriesStorage) maintainArchivedSeries(fp clientmodel.Fingerprint, beforeTime clientmodel.Timestamp) {
s.fpLocker.Lock(fp)
defer s.fpLocker.Unlock(fp)
if series, ok := s.fpToSeries.get(fp); ok {
// Deal with series in memory.
if !series.firstTime().Before(beforeTime) {
// Oldest sample not old enough.
return
}
newFirstTime, numDropped, allDropped, err := s.persistence.dropChunks(fp, beforeTime)
if err != nil {
glog.Error("Error purging persisted chunks: ", err)
}
numPurged, allPurged := series.purgeOlderThan(beforeTime)
if allPurged && allDropped {
s.fpToSeries.del(fp)
s.numSeries.Dec()
s.seriesOps.WithLabelValues(memoryPurge).Inc()
s.persistence.unindexMetric(fp, series.metric)
} else if series.chunkDescsOffset != -1 {
series.savedFirstTime = newFirstTime
series.chunkDescsOffset += numPurged - numDropped
if series.chunkDescsOffset < 0 {
panic("dropped more chunks from persistence than from memory")
}
}
return
}
// Deal with archived series.
has, firstTime, lastTime, err := s.persistence.hasArchivedMetric(fp)
if err != nil {
glog.Error("Error looking up archived time range: ", err)
@ -944,13 +971,15 @@ func (s *memorySeriesStorage) purgeSeries(fp clientmodel.Fingerprint, beforeTime
return
}
defer s.seriesOps.WithLabelValues(archiveMaintenance).Inc()
newFirstTime, _, allDropped, err := s.persistence.dropChunks(fp, beforeTime)
if err != nil {
glog.Error("Error purging persisted chunks: ", err)
glog.Error("Error dropping persisted chunks: ", err)
}
if allDropped {
if err := s.persistence.dropArchivedMetric(fp); err != nil {
glog.Errorf("Error dropping archived metric for fingerprint %v: %v", fp, err)
if err := s.persistence.purgeArchivedMetric(fp); err != nil {
glog.Errorf("Error purging archived metric for fingerprint %v: %v", fp, err)
return
}
s.seriesOps.WithLabelValues(archivePurge).Inc()

35
storage/local/storage_test.go
View File

@ -36,6 +36,9 @@ func TestGetFingerprintsForLabelMatchers(t *testing.T) {
// TestLoop is just a smoke test for the loop method, if we can switch it on and
// off without disaster.
func TestLoop(t *testing.T) {
if testing.Short() {
t.Skip("Skipping test in short mode.")
}
samples := make(clientmodel.Samples, 1000)
for i := range samples {
samples[i] = &clientmodel.Sample{
@ -57,8 +60,18 @@ func TestLoop(t *testing.T) {
}
storage.Start()
storage.AppendSamples(samples)
time.Sleep(time.Second)
storage.WaitForIndexing()
series, _ := storage.(*memorySeriesStorage).fpToSeries.get(clientmodel.Metric{}.Fingerprint())
cdsBefore := len(series.chunkDescs)
time.Sleep(fpMaxWaitDuration + time.Second) // TODO(beorn7): Ugh, need to wait for maintenance to kick in.
cdsAfter := len(series.chunkDescs)
storage.Stop()
if cdsBefore <= cdsAfter {
t.Errorf(
"Number of chunk descriptors should have gone down by now. Got before %d, after %d.",
cdsBefore, cdsAfter,
)
}
}
func TestChunk(t *testing.T) {
@ -337,15 +350,15 @@ func TestEvictAndPurgeSeries(t *testing.T) {
s, closer := NewTestStorage(t)
defer closer.Close()
ms := s.(*memorySeriesStorage) // Going to test the internal purgeSeries method.
ms := s.(*memorySeriesStorage) // Going to test the internal maintain.*Series methods.
s.AppendSamples(samples)
s.WaitForIndexing()
fp := clientmodel.Metric{}.Fingerprint()
// Purge ~half of the chunks.
ms.purgeSeries(fp, 1000)
// Drop ~half of the chunks.
ms.maintainMemorySeries(fp, 1000)
it := s.NewIterator(fp)
actual := it.GetBoundaryValues(metric.Interval{
OldestInclusive: 0,
@ -362,8 +375,8 @@ func TestEvictAndPurgeSeries(t *testing.T) {
t.Errorf("2nd timestamp: want %v, got %v", want, actual[1].Timestamp)
}
// Purge everything.
ms.purgeSeries(fp, 10000)
// Drop everything.
ms.maintainMemorySeries(fp, 10000)
it = s.NewIterator(fp)
actual = it.GetBoundaryValues(metric.Interval{
OldestInclusive: 0,
@ -403,18 +416,18 @@ func TestEvictAndPurgeSeries(t *testing.T) {
t.Fatal("not archived")
}
// Purge ~half of the chunks of an archived series.
ms.purgeSeries(fp, 1000)
// Drop ~half of the chunks of an archived series.
ms.maintainArchivedSeries(fp, 1000)
archived, _, _, err = ms.persistence.hasArchivedMetric(fp)
if err != nil {
t.Fatal(err)
}
if !archived {
t.Fatal("archived series dropped although only half of the chunks purged")
t.Fatal("archived series purged although only half of the chunks dropped")
}
// Purge everything.
ms.purgeSeries(fp, 10000)
// Drop everything.
ms.maintainArchivedSeries(fp, 10000)
archived, _, _, err = ms.persistence.hasArchivedMetric(fp)
if err != nil {
t.Fatal(err)