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Small cleanups and comments in tiered storage.

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Julius Volz 2013-03-12 10:26:53 -07:00 committed by Matt T. Proud
parent f238b23b04
commit 894ecfe161
1 changed files with 23 additions and 13 deletions
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30
storage/metric/tiered.go
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@ -383,6 +383,7 @@ func (t *tieredStorage) renderView(viewJob viewJob) (err error) {
for _, operation := range scanJob.operations {
if seriesFrontier.lastTime.Before(operation.StartsAt()) {
// fmt.Printf("operation %s occurs after %s; aborting...\n", operation, seriesFrontier.lastTime)
// XXXXXX
break
}
@ -390,9 +391,13 @@ func (t *tieredStorage) renderView(viewJob viewJob) (err error) {
if operation.StartsAt().Before(seriesFrontier.firstSupertime) {
// fmt.Printf("operation %s occurs before %s; discarding...\n", operation, seriesFrontier.firstSupertime)
// XXXXXX
continue
}
// If the operation starts in the last supertime block, but before
// the end of a series, set the seek time to be within the key space
// so as not to invalidate the iterator.
if seriesFrontier.lastSupertime.Before(operation.StartsAt()) && !seriesFrontier.lastTime.Before(operation.StartsAt()) {
targetKey.Timestamp = indexable.EncodeTime(seriesFrontier.lastSupertime)
} else {
@ -403,7 +408,6 @@ func (t *tieredStorage) renderView(viewJob viewJob) (err error) {
rawKey, _ := coding.NewProtocolBufferEncoder(targetKey).Encode()
// XXX: Use frontiers to manage out of range queries.
iterator.Seek(rawKey)
foundKey, err = extractSampleKey(iterator)
@ -412,22 +416,28 @@ func (t *tieredStorage) renderView(viewJob viewJob) (err error) {
}
var (
fst = indexable.DecodeTime(foundKey.Timestamp)
lst = time.Unix(*foundKey.LastTimestamp, 0)
firstTime = indexable.DecodeTime(foundKey.Timestamp)
lastTime = time.Unix(*foundKey.LastTimestamp, 0)
)
if !((operation.StartsAt().Before(fst)) || lst.Before(operation.StartsAt())) {
if operation.StartsAt().Before(firstTime) {
// Imagine the following supertime blocks with last time ranges:
//
// Block 1: ft 1000 - lt 1009 <data>
// Block 1: ft 1010 - lt 1019 <data>
//
// If an operation started at time 1005, we would first seek to the
// block with supertime 1010, then need to rewind by one block by
// virtue of LevelDB iterator seek behavior.
fmt.Printf("operation %s may occur in next entity; rewinding...\n", operation)
iterator.Previous()
panic("oops")
}
// fmt.Printf("operation %s occurs inside of %s...\n", operation, foundKey)
foundValue, err = extractSampleValue(iterator)
if err != nil {
panic(err)
}
} else if operation.StartsAt().Before(fst) {
fmt.Printf("operation %s may occur in next entity; fast forwarding...\n", operation)
panic("oops")
} else {
panic("illegal state")
}
var (
elementCount = len(foundValue.Value)