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storage: add comment around compact

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This commit is contained in:
Xiang Li 2015-05-14 17:55:54 -07:00
parent ee47973199
commit 660fd5e3e1
1 changed files with 2 additions and 0 deletions
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2
storage/index.go
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@ -73,6 +73,8 @@ func (ti *treeIndex) Compact(index uint64) map[uint64]struct{} {
available := make(map[uint64]struct{})
emptyki := make([]*keyIndex, 0)
log.Printf("store.index: compact %d", index)
// TODO: do not hold the lock for long time?
// This is probably OK. Compacting 10M keys takes O(10ms).
ti.Lock()
defer ti.Unlock()
ti.tree.Ascend(compactIndex(index, available, &emptyki))