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scorch zap loadChunk reuses Location slices

This commit is contained in:
Steve Yen 2018-02-13 09:16:20 -08:00
parent 4dbb4b1495
commit dd7d93ee5e
1 changed files with 17 additions and 7 deletions
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24
index/scorch/segment/zap/posting.go
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@ -171,7 +171,8 @@ type PostingsIterator struct {
locBitmap *roaring.Bitmap
next Posting
next Posting // reused across Next() calls
nextLocs []Location // reused across Next() calls
}
func (i *PostingsIterator) loadChunk(chunk int) error {
@ -333,7 +334,8 @@ func (i *PostingsIterator) Next() (segment.Posting, error) {
}
}
i.next = Posting{} // clear the struct.
reuseLocs := i.next.locs // hold for reuse before struct clearing
i.next = Posting{} // clear the struct
rv := &i.next
rv.iterator = i
rv.docNum = uint64(n)
@ -346,15 +348,23 @@ func (i *PostingsIterator) Next() (segment.Posting, error) {
}
rv.norm = math.Float32frombits(uint32(normBits))
if i.locBitmap.Contains(n) {
// read off 'freq' locations
rv.locs = make([]segment.Location, rv.freq)
locs := make([]Location, rv.freq)
// read off 'freq' locations, into reused slices
if cap(i.nextLocs) >= int(rv.freq) {
i.nextLocs = i.nextLocs[0:rv.freq]
} else {
i.nextLocs = make([]Location, rv.freq)
}
if cap(reuseLocs) >= int(rv.freq) {
rv.locs = reuseLocs[0:rv.freq]
} else {
rv.locs = make([]segment.Location, rv.freq)
}
for j := 0; j < int(rv.freq); j++ {
err := i.readLocation(&locs[j])
err := i.readLocation(&i.nextLocs[j])
if err != nil {
return nil, err
}
rv.locs[j] = &locs[j]
rv.locs[j] = &i.nextLocs[j]
}
}