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mvcc: release lock early when traversing index

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Make a copy-on-write clone of index tree when traversing. So that lock
can be released right after the clone to improve backend concurrency.
This commit is contained in:
Jingyi Hu 2019-03-06 14:14:20 -08:00
parent 4b69cfc56b
commit 93732df3ef
1 changed files with 3 additions and 2 deletions
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5
mvcc/index.go
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@ -92,9 +92,10 @@ func (ti *treeIndex) visit(key, end []byte, f func(ki *keyIndex)) {
keyi, endi := &keyIndex{key: key}, &keyIndex{key: end}
ti.RLock()
defer ti.RUnlock()
clone := ti.tree.Clone()
ti.RUnlock()
ti.tree.AscendGreaterOrEqual(keyi, func(item btree.Item) bool {
clone.AscendGreaterOrEqual(keyi, func(item btree.Item) bool {
if len(endi.key) > 0 && !item.Less(endi) {
return false
}