// Apply implements the Processor interface.
func (p *CompactionProcessor) Apply(sampleIterator leveldb.Iterator, samplesPersistence raw.Persistence, stopAt clientmodel.Timestamp, fingerprint *clientmodel.Fingerprint) (lastCurated clientmodel.Timestamp, err error) {
var pendingBatch raw.Batch
defer func() {
if pendingBatch != nil {
pendingBatch.Close()
}
}()
var pendingMutations = 0
var pendingSamples metric.Values
var unactedSamples metric.Values
var lastTouchedTime clientmodel.Timestamp
var keyDropped bool
sampleKey, _ := p.sampleKeys.Get()
defer p.sampleKeys.Give(sampleKey)
sampleKeyDto, _ := p.dtoSampleKeys.Get()
defer p.dtoSampleKeys.Give(sampleKeyDto)
if err = sampleIterator.Key(sampleKeyDto); err != nil {
return
}
sampleKey.Load(sampleKeyDto)
unactedSamples = unmarshalValues(sampleIterator.RawValue(), nil)
for lastCurated.Before(stopAt) && lastTouchedTime.Before(stopAt) && sampleKey.Fingerprint.Equal(fingerprint) {
switch {
// Furnish a new pending batch operation if none is available.
case pendingBatch == nil:
pendingBatch = leveldb.NewBatch()
// If there are no sample values to extract from the datastore, let's
// continue extracting more values to use. We know that the time.Before()
// block would prevent us from going into unsafe territory.
case len(unactedSamples) == 0:
if !sampleIterator.Next() {
return lastCurated, fmt.Errorf("illegal condition: invalid iterator on continuation")
}
keyDropped = false
if err = sampleIterator.Key(sampleKeyDto); err != nil {
return
}
sampleKey.Load(sampleKeyDto)
if !sampleKey.Fingerprint.Equal(fingerprint) {
break
}
unactedSamples = unmarshalValues(sampleIterator.RawValue(), nil)
// If the number of pending mutations exceeds the allowed batch amount,
// commit to disk and delete the batch. A new one will be recreated if
// necessary.
case pendingMutations >= p.maximumMutationPoolBatch:
err = samplesPersistence.Commit(pendingBatch)
if err != nil {
return
}
pendingMutations = 0
pendingBatch.Close()
pendingBatch = nil
case len(pendingSamples) == 0 && len(unactedSamples) >= p.minimumGroupSize:
lastTouchedTime = unactedSamples[len(unactedSamples)-1].Timestamp
unactedSamples = metric.Values{}
case len(pendingSamples)+len(unactedSamples) < p.minimumGroupSize:
if !keyDropped {
k := &dto.SampleKey{}
sampleKey.Dump(k)
pendingBatch.Drop(k)
keyDropped = true
}
pendingSamples = append(pendingSamples, unactedSamples...)
lastTouchedTime = unactedSamples[len(unactedSamples)-1].Timestamp
unactedSamples = metric.Values{}
pendingMutations++
// If the number of pending writes equals the target group size
case len(pendingSamples) == p.minimumGroupSize:
k := &dto.SampleKey{}
newSampleKey := buildSampleKey(fingerprint, pendingSamples)
newSampleKey.Dump(k)
b := marshalValues(pendingSamples, nil)
pendingBatch.PutRaw(k, b)
pendingMutations++
lastCurated = newSampleKey.FirstTimestamp
if len(unactedSamples) > 0 {
if !keyDropped {
sampleKey.Dump(k)
pendingBatch.Drop(k)
keyDropped = true
}
if len(unactedSamples) > p.minimumGroupSize {
pendingSamples = unactedSamples[:p.minimumGroupSize]
unactedSamples = unactedSamples[p.minimumGroupSize:]
lastTouchedTime = unactedSamples[len(unactedSamples)-1].Timestamp
} else {
pendingSamples = unactedSamples
lastTouchedTime = pendingSamples[len(pendingSamples)-1].Timestamp
unactedSamples = metric.Values{}
}
}
case len(pendingSamples)+len(unactedSamples) >= p.minimumGroupSize:
if !keyDropped {
k := &dto.SampleKey{}
sampleKey.Dump(k)
pendingBatch.Drop(k)
keyDropped = true
}
remainder := p.minimumGroupSize - len(pendingSamples)
pendingSamples = append(pendingSamples, unactedSamples[:remainder]...)
unactedSamples = unactedSamples[remainder:]
if len(unactedSamples) == 0 {
lastTouchedTime = pendingSamples[len(pendingSamples)-1].Timestamp
} else {
lastTouchedTime = unactedSamples[len(unactedSamples)-1].Timestamp
}
pendingMutations++
default:
err = fmt.Errorf("unhandled processing case")
}
}
if len(unactedSamples) > 0 || len(pendingSamples) > 0 {
pendingSamples = append(pendingSamples, unactedSamples...)
k := &dto.SampleKey{}
newSampleKey := buildSampleKey(fingerprint, pendingSamples)
newSampleKey.Dump(k)
b := marshalValues(pendingSamples, nil)
pendingBatch.PutRaw(k, b)
pendingSamples = metric.Values{}
pendingMutations++
lastCurated = newSampleKey.FirstTimestamp
}
// This is not deferred due to the off-chance that a pre-existing commit
// failed.
if pendingBatch != nil && pendingMutations > 0 {
err = samplesPersistence.Commit(pendingBatch)
if err != nil {
return
}
}
return
}
// Apply implements the Processor interface.
func (p *DeletionProcessor) Apply(sampleIterator leveldb.Iterator, samplesPersistence raw.Persistence, stopAt clientmodel.Timestamp, fingerprint *clientmodel.Fingerprint) (lastCurated clientmodel.Timestamp, err error) {
var pendingBatch raw.Batch
defer func() {
if pendingBatch != nil {
pendingBatch.Close()
}
}()
sampleKeyDto, _ := p.dtoSampleKeys.Get()
defer p.dtoSampleKeys.Give(sampleKeyDto)
sampleKey, _ := p.sampleKeys.Get()
defer p.sampleKeys.Give(sampleKey)
if err = sampleIterator.Key(sampleKeyDto); err != nil {
return
}
sampleKey.Load(sampleKeyDto)
sampleValues := unmarshalValues(sampleIterator.RawValue(), nil)
pendingMutations := 0
for lastCurated.Before(stopAt) && sampleKey.Fingerprint.Equal(fingerprint) {
switch {
// Furnish a new pending batch operation if none is available.
case pendingBatch == nil:
pendingBatch = leveldb.NewBatch()
// If there are no sample values to extract from the datastore,
// let's continue extracting more values to use. We know that
// the time.Before() block would prevent us from going into
// unsafe territory.
case len(sampleValues) == 0:
if !sampleIterator.Next() {
return lastCurated, fmt.Errorf("illegal condition: invalid iterator on continuation")
}
if err = sampleIterator.Key(sampleKeyDto); err != nil {
return
}
sampleKey.Load(sampleKeyDto)
sampleValues = unmarshalValues(sampleIterator.RawValue(), nil)
// If the number of pending mutations exceeds the allowed batch
// amount, commit to disk and delete the batch. A new one will
// be recreated if necessary.
case pendingMutations >= p.maximumMutationPoolBatch:
err = samplesPersistence.Commit(pendingBatch)
if err != nil {
return
}
pendingMutations = 0
pendingBatch.Close()
pendingBatch = nil
case !sampleKey.MayContain(stopAt):
k := &dto.SampleKey{}
sampleKey.Dump(k)
pendingBatch.Drop(k)
lastCurated = sampleKey.LastTimestamp
sampleValues = metric.Values{}
pendingMutations++
case sampleKey.MayContain(stopAt):
k := &dto.SampleKey{}
sampleKey.Dump(k)
pendingBatch.Drop(k)
pendingMutations++
sampleValues = sampleValues.TruncateBefore(stopAt)
if len(sampleValues) > 0 {
k := &dto.SampleKey{}
sampleKey = buildSampleKey(fingerprint, sampleValues)
sampleKey.Dump(k)
lastCurated = sampleKey.FirstTimestamp
v := marshalValues(sampleValues, nil)
pendingBatch.PutRaw(k, v)
pendingMutations++
} else {
lastCurated = sampleKey.LastTimestamp
}
default:
err = fmt.Errorf("unhandled processing case")
}
}
// This is not deferred due to the off-chance that a pre-existing commit
// failed.
if pendingBatch != nil && pendingMutations > 0 {
err = samplesPersistence.Commit(pendingBatch)
if err != nil {
return
}
}
return
}
