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Print oldest celldb snapshot to stats (#1078)

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Co-authored-by: SpyCheese <mikle98@yandex.ru>
This commit is contained in:
EmelyanenkoK 2024-07-26 22:11:58 +03:00 • committed by GitHub
parent 679e6be294
commit b3828f8eb2
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6 changed files with 83 additions and 3 deletions
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43
tddb/td/db/RocksDb.cpp
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@ -258,11 +258,17 @@ Status RocksDb::flush() {
Status RocksDb::begin_snapshot() {
snapshot_.reset(db_->GetSnapshot());
if (options_.snapshot_statistics) {
options_.snapshot_statistics->begin_snapshot(snapshot_.get());
}
return td::Status::OK();
}
Status RocksDb::end_snapshot() {
if (snapshot_) {
if (options_.snapshot_statistics) {
options_.snapshot_statistics->end_snapshot(snapshot_.get());
}
db_->ReleaseSnapshot(snapshot_.release());
}
return td::Status::OK();
@ -271,4 +277,41 @@ Status RocksDb::end_snapshot() {
RocksDb::RocksDb(std::shared_ptr<rocksdb::OptimisticTransactionDB> db, RocksDbOptions options)
: db_(std::move(db)), options_(options) {
}
void RocksDbSnapshotStatistics::begin_snapshot(const rocksdb::Snapshot *snapshot) {
auto lock = std::unique_lock<std::mutex>(mutex_);
auto id = reinterpret_cast<std::uintptr_t>(snapshot);
auto ts = td::Timestamp::now().at();
CHECK(id_to_ts_.emplace(id, ts).second);
CHECK(by_ts_.emplace(ts, id).second);
}
void RocksDbSnapshotStatistics::end_snapshot(const rocksdb::Snapshot *snapshot) {
auto id = reinterpret_cast<std::uintptr_t>(snapshot);
auto it = id_to_ts_.find(id);
CHECK(it != id_to_ts_.end());
auto ts = it->second;
CHECK(by_ts_.erase(std::make_pair(ts, id)) == 1u);
CHECK(id_to_ts_.erase(id) == 1u);
}
td::Timestamp RocksDbSnapshotStatistics::oldest_snapshot_timestamp() const {
auto lock = std::unique_lock<std::mutex>(mutex_);
if (by_ts_.empty()) {
return {};
}
return td::Timestamp::at(by_ts_.begin()->first);
}
std::string RocksDbSnapshotStatistics::to_string() const {
td::Timestamp oldest_snapshot = oldest_snapshot_timestamp();
double value;
if (oldest_snapshot) {
value = td::Timestamp::now().at() - oldest_snapshot.at();
} else {
value = -1;
}
return PSTRING() << "td.rocksdb.snapshot.oldest_snapshot_ago.seconds : " << value << "\n";
}
} // namespace td