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optimized code (#11614)

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Summary:
improvement code by std::move and c++17

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11614

Reviewed By: ajkr

Differential Revision: D47599519

Pulled By: jowlyzhang

fbshipit-source-id: 6b897876f4e87e94a74c53d8db2a01303d500bff
This commit is contained in:
shuzz 2023-07-19 12:52:39 -07:00 committed by Facebook GitHub Bot
parent aeda36e925
commit 2f712235ab
1 changed files with 8 additions and 10 deletions
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14
db/db_impl/db_impl_compaction_flush.cc
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@ -2775,7 +2775,7 @@ ColumnFamilyData* DBImpl::PopFirstFromCompactionQueue() {
DBImpl::FlushRequest DBImpl::PopFirstFromFlushQueue() { DBImpl::FlushRequest DBImpl::PopFirstFromFlushQueue() {
assert(!flush_queue_.empty()); assert(!flush_queue_.empty());
FlushRequest flush_req = flush_queue_.front(); FlushRequest flush_req = std::move(flush_queue_.front());
flush_queue_.pop_front(); flush_queue_.pop_front();
if (!immutable_db_options_.atomic_flush) { if (!immutable_db_options_.atomic_flush) {
assert(flush_req.cfd_to_max_mem_id_to_persist.size() == 1); assert(flush_req.cfd_to_max_mem_id_to_persist.size() == 1);
@ -2970,14 +2970,12 @@ Status DBImpl::BackgroundFlush(bool* made_progress, JobContext* job_context,
autovector<ColumnFamilyData*> column_families_not_to_flush; autovector<ColumnFamilyData*> column_families_not_to_flush;
while (!flush_queue_.empty()) { while (!flush_queue_.empty()) {
// This cfd is already referenced // This cfd is already referenced
const FlushRequest& flush_req = PopFirstFromFlushQueue(); auto [flush_reason, cfd_to_max_mem_id_to_persist] =
FlushReason flush_reason = flush_req.flush_reason; PopFirstFromFlushQueue();
superversion_contexts.clear(); superversion_contexts.clear();
superversion_contexts.reserve( superversion_contexts.reserve(cfd_to_max_mem_id_to_persist.size());
flush_req.cfd_to_max_mem_id_to_persist.size());
for (const auto& iter : flush_req.cfd_to_max_mem_id_to_persist) { for (const auto& [cfd, max_memtable_id] : cfd_to_max_mem_id_to_persist) {
ColumnFamilyData* cfd = iter.first;
if (cfd->GetMempurgeUsed()) { if (cfd->GetMempurgeUsed()) {
// If imm() contains silent memtables (e.g.: because // If imm() contains silent memtables (e.g.: because
// MemPurge was activated), requesting a flush will // MemPurge was activated), requesting a flush will
@ -2991,7 +2989,7 @@ Status DBImpl::BackgroundFlush(bool* made_progress, JobContext* job_context,
continue; continue;
} }
superversion_contexts.emplace_back(SuperVersionContext(true)); superversion_contexts.emplace_back(SuperVersionContext(true));
bg_flush_args.emplace_back(cfd, iter.second, bg_flush_args.emplace_back(cfd, max_memtable_id,
&(superversion_contexts.back()), flush_reason); &(superversion_contexts.back()), flush_reason);
} }
if (!bg_flush_args.empty()) { if (!bg_flush_args.empty()) {