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save a few redundant container lookups (#5875)

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Summary:
This PR eliminates repeated lookups in associative or ordered containers when a single lookup suffices.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5875

Differential Revision: D17753172

Pulled By: anand1976

fbshipit-source-id: 796b02b760082521d8c42a1cb65a76bf0e6c1b8e
This commit is contained in:
jsteemann 2019-10-07 12:21:39 -07:00 committed by Facebook Github Bot
parent 19a97dd139
commit da3b2840cb
3 changed files with 9 additions and 10 deletions
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10
db/version_builder.cc
View File

@ -303,10 +303,7 @@ class VersionBuilder::Rep {
levels_[level].added_files.erase(exising);
}
} else {
auto exising = invalid_levels_[level].find(number);
if (exising != invalid_levels_[level].end()) {
invalid_levels_[level].erase(exising);
} else {
if (invalid_levels_[level].erase(number) == 0) {
// Deleting an non-existing file on invalid level.
has_invalid_levels_ = true;
}
@ -326,8 +323,9 @@ class VersionBuilder::Rep {
levels_[level].added_files[f->fd.GetNumber()] = f;
} else {
uint64_t number = new_file.second.fd.GetNumber();
if (invalid_levels_[level].count(number) == 0) {
invalid_levels_[level].insert(number);
auto& lvls = invalid_levels_[level];
if (lvls.count(number) == 0) {
lvls.insert(number);
} else {
// Creating an already existing file on invalid level.
has_invalid_levels_ = true;

7
utilities/transactions/pessimistic_transaction.cc
View File

@ -473,10 +473,11 @@ Status PessimisticTransaction::LockBatch(WriteBatch* batch,
void RecordKey(uint32_t column_family_id, const Slice& key) {
std::string key_str = key.ToString();
auto iter = (keys_)[column_family_id].find(key_str);
if (iter == (keys_)[column_family_id].end()) {
auto& cfh_keys = keys_[column_family_id];
auto iter = cfh_keys.find(key_str);
if (iter == cfh_keys.end()) {
// key not yet seen, store it.
(keys_)[column_family_id].insert({std::move(key_str)});
cfh_keys.insert({std::move(key_str)});
}
}

2
utilities/transactions/transaction_base.cc
View File

@ -170,7 +170,7 @@ Status TransactionBaseImpl::RollbackToSavePoint() {
}
if (tracked_keys_iter->second.num_reads == 0 &&
tracked_keys_iter->second.num_writes == 0) {
tracked_keys_[column_family_id].erase(tracked_keys_iter);
cf_tracked_keys.erase(tracked_keys_iter);
}
}
}