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Fixed comparison in ForwardIterator when computing hint for GetNextLevelIndex() 

Summary: When computing the hint for GetNextLevelIndex(), ForwardIterator was doing a redundant comparison. This patch fixes the comparison (using https://github.com/facebook/rocksdb/blob/master/db/version_set.cc#L158 as a reference) and moves it inside an assert because we expect `level_files[f_idx]` to contain the next key after Seek(), so user_key should always be smaller than the largest key.

Test Plan: make clean all check

Reviewers: rven, anthony, yhchiang, igor, sdong

Reviewed By: sdong

Subscribers: tnovak, sdong, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D46227
This commit is contained in:
Andres Noetzli 2015-09-08 09:47:54 -07:00
parent 91f3c90792
commit 3a0df7f161
1 changed files with 4 additions and 8 deletions
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12
db/forward_iterator.cc
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@ -334,14 +334,10 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
if (f_idx < level_files.size()) {
int cmp_smallest = user_comparator_->Compare(
user_key, level_files[f_idx]->smallest.user_key());
int cmp_largest = -1;
if (cmp_smallest >= 0) {
cmp_smallest = user_comparator_->Compare(
user_key, level_files[f_idx]->smallest.user_key());
}
indexer.GetNextLevelIndex(level, f_idx,
cmp_smallest, cmp_largest,
&search_left_bound, &search_right_bound);
assert(user_comparator_->Compare(
user_key, level_files[f_idx]->largest.user_key()) < 0);
indexer.GetNextLevelIndex(level, f_idx, cmp_smallest, -1,
&search_left_bound, &search_right_bound);
} else {
indexer.GetNextLevelIndex(
level, level_files.size() - 1,