fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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319 lines
9.2 KiB
319 lines
9.2 KiB
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#include "file/file_util.h"
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#include "port/port.h"
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#include "port/stack_trace.h"
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#include "rocksdb/utilities/transaction_db.h"
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#include "test_util/testharness.h"
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#include "test_util/testutil.h"
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#include "utilities/transactions/lock/point/point_lock_manager.h"
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#include "utilities/transactions/pessimistic_transaction_db.h"
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#include "utilities/transactions/transaction_db_mutex_impl.h"
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namespace ROCKSDB_NAMESPACE {
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class MockColumnFamilyHandle : public ColumnFamilyHandle {
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public:
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explicit MockColumnFamilyHandle(ColumnFamilyId cf_id) : cf_id_(cf_id) {}
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~MockColumnFamilyHandle() override {}
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const std::string& GetName() const override { return name_; }
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ColumnFamilyId GetID() const override { return cf_id_; }
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Status GetDescriptor(ColumnFamilyDescriptor*) override {
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return Status::OK();
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}
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const Comparator* GetComparator() const override {
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return BytewiseComparator();
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}
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private:
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ColumnFamilyId cf_id_;
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std::string name_ = "MockCF";
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};
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class PointLockManagerTest : public testing::Test {
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public:
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void SetUp() override {
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env_ = Env::Default();
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db_dir_ = test::PerThreadDBPath("point_lock_manager_test");
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ASSERT_OK(env_->CreateDir(db_dir_));
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Options opt;
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opt.create_if_missing = true;
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TransactionDBOptions txn_opt;
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txn_opt.transaction_lock_timeout = 0;
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ASSERT_OK(TransactionDB::Open(opt, txn_opt, db_dir_, &db_));
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// CAUTION: This test creates a separate lock manager object (right, NOT
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// the one that the TransactionDB is using!), and runs tests on it.
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locker_.reset(new PointLockManager(
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static_cast<PessimisticTransactionDB*>(db_), txn_opt));
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wait_sync_point_name_ = "PointLockManager::AcquireWithTimeout:WaitingTxn";
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}
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void TearDown() override {
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delete db_;
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EXPECT_OK(DestroyDir(env_, db_dir_));
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}
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PessimisticTransaction* NewTxn(
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TransactionOptions txn_opt = TransactionOptions()) {
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Transaction* txn = db_->BeginTransaction(WriteOptions(), txn_opt);
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return reinterpret_cast<PessimisticTransaction*>(txn);
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}
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protected:
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Env* env_;
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std::shared_ptr<LockManager> locker_;
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const char* wait_sync_point_name_;
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friend void PointLockManagerTestExternalSetup(PointLockManagerTest*);
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private:
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std::string db_dir_;
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TransactionDB* db_;
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};
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typedef void (*init_func_t)(PointLockManagerTest*);
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class AnyLockManagerTest : public PointLockManagerTest,
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public testing::WithParamInterface<init_func_t> {
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public:
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void SetUp() override {
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// If a custom setup function was provided, use it. Otherwise, use what we
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// have inherited.
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auto init_func = GetParam();
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if (init_func)
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(*init_func)(this);
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else
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PointLockManagerTest::SetUp();
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}
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};
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TEST_P(AnyLockManagerTest, ReentrantExclusiveLock) {
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// Tests that a txn can acquire exclusive lock on the same key repeatedly.
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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auto txn = NewTxn();
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, true));
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, true));
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// Cleanup
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locker_->UnLock(txn, 1, "k", env_);
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delete txn;
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}
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TEST_P(AnyLockManagerTest, ReentrantSharedLock) {
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// Tests that a txn can acquire shared lock on the same key repeatedly.
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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auto txn = NewTxn();
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, false));
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, false));
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// Cleanup
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locker_->UnLock(txn, 1, "k", env_);
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delete txn;
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}
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TEST_P(AnyLockManagerTest, LockUpgrade) {
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// Tests that a txn can upgrade from a shared lock to an exclusive lock.
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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auto txn = NewTxn();
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, false));
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, true));
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// Cleanup
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locker_->UnLock(txn, 1, "k", env_);
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delete txn;
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}
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TEST_P(AnyLockManagerTest, LockDowngrade) {
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// Tests that a txn can acquire a shared lock after acquiring an exclusive
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// lock on the same key.
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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auto txn = NewTxn();
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, true));
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ASSERT_OK(locker_->TryLock(txn, 1, "k", env_, false));
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// Cleanup
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locker_->UnLock(txn, 1, "k", env_);
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delete txn;
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}
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TEST_P(AnyLockManagerTest, LockConflict) {
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// Tests that lock conflicts lead to lock timeout.
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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auto txn1 = NewTxn();
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auto txn2 = NewTxn();
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{
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// exclusive-exclusive conflict.
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ASSERT_OK(locker_->TryLock(txn1, 1, "k1", env_, true));
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auto s = locker_->TryLock(txn2, 1, "k1", env_, true);
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ASSERT_TRUE(s.IsTimedOut());
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}
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{
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// exclusive-shared conflict.
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ASSERT_OK(locker_->TryLock(txn1, 1, "k2", env_, true));
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auto s = locker_->TryLock(txn2, 1, "k2", env_, false);
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ASSERT_TRUE(s.IsTimedOut());
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}
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{
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// shared-exclusive conflict.
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ASSERT_OK(locker_->TryLock(txn1, 1, "k2", env_, false));
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auto s = locker_->TryLock(txn2, 1, "k2", env_, true);
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ASSERT_TRUE(s.IsTimedOut());
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}
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// Cleanup
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locker_->UnLock(txn1, 1, "k1", env_);
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locker_->UnLock(txn1, 1, "k2", env_);
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delete txn1;
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delete txn2;
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}
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port::Thread BlockUntilWaitingTxn(const char* sync_point_name,
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std::function<void()> f) {
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std::atomic<bool> reached(false);
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
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sync_point_name, [&](void* /*arg*/) { reached.store(true); });
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
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port::Thread t(f);
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while (!reached.load()) {
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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}
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
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return t;
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}
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TEST_P(AnyLockManagerTest, SharedLocks) {
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// Tests that shared locks can be concurrently held by multiple transactions.
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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auto txn1 = NewTxn();
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auto txn2 = NewTxn();
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ASSERT_OK(locker_->TryLock(txn1, 1, "k", env_, false));
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ASSERT_OK(locker_->TryLock(txn2, 1, "k", env_, false));
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// Cleanup
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locker_->UnLock(txn1, 1, "k", env_);
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locker_->UnLock(txn2, 1, "k", env_);
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delete txn1;
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delete txn2;
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}
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TEST_P(AnyLockManagerTest, Deadlock) {
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// Tests that deadlock can be detected.
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// Deadlock scenario:
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// txn1 exclusively locks k1, and wants to lock k2;
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// txn2 exclusively locks k2, and wants to lock k1.
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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TransactionOptions txn_opt;
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txn_opt.deadlock_detect = true;
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txn_opt.lock_timeout = 1000000;
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auto txn1 = NewTxn(txn_opt);
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auto txn2 = NewTxn(txn_opt);
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ASSERT_OK(locker_->TryLock(txn1, 1, "k1", env_, true));
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ASSERT_OK(locker_->TryLock(txn2, 1, "k2", env_, true));
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// txn1 tries to lock k2, will block forever.
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port::Thread t = BlockUntilWaitingTxn(wait_sync_point_name_, [&]() {
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// block because txn2 is holding a lock on k2.
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locker_->TryLock(txn1, 1, "k2", env_, true);
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});
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auto s = locker_->TryLock(txn2, 1, "k1", env_, true);
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ASSERT_TRUE(s.IsBusy());
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ASSERT_EQ(s.subcode(), Status::SubCode::kDeadlock);
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std::vector<DeadlockPath> deadlock_paths = locker_->GetDeadlockInfoBuffer();
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ASSERT_EQ(deadlock_paths.size(), 1u);
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ASSERT_FALSE(deadlock_paths[0].limit_exceeded);
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std::vector<DeadlockInfo> deadlocks = deadlock_paths[0].path;
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ASSERT_EQ(deadlocks.size(), 2u);
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ASSERT_EQ(deadlocks[0].m_txn_id, txn1->GetID());
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ASSERT_EQ(deadlocks[0].m_cf_id, 1u);
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ASSERT_TRUE(deadlocks[0].m_exclusive);
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ASSERT_EQ(deadlocks[0].m_waiting_key, "k2");
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ASSERT_EQ(deadlocks[1].m_txn_id, txn2->GetID());
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ASSERT_EQ(deadlocks[1].m_cf_id, 1u);
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ASSERT_TRUE(deadlocks[1].m_exclusive);
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ASSERT_EQ(deadlocks[1].m_waiting_key, "k1");
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locker_->UnLock(txn2, 1, "k2", env_);
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t.join();
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// Cleanup
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locker_->UnLock(txn1, 1, "k1", env_);
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locker_->UnLock(txn1, 1, "k2", env_);
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delete txn2;
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delete txn1;
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}
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TEST_P(AnyLockManagerTest, GetWaitingTxns_MultipleTxns) {
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MockColumnFamilyHandle cf(1);
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locker_->AddColumnFamily(&cf);
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auto txn1 = NewTxn();
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ASSERT_OK(locker_->TryLock(txn1, 1, "k", env_, false));
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auto txn2 = NewTxn();
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ASSERT_OK(locker_->TryLock(txn2, 1, "k", env_, false));
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auto txn3 = NewTxn();
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txn3->SetLockTimeout(10000);
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port::Thread t1 = BlockUntilWaitingTxn(wait_sync_point_name_, [&]() {
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ASSERT_OK(locker_->TryLock(txn3, 1, "k", env_, true));
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locker_->UnLock(txn3, 1, "k", env_);
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});
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// Ok, now txn3 is waiting for lock on "k", which is owned by two
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// transactions. Check that GetWaitingTxns reports this correctly
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uint32_t wait_cf_id;
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std::string wait_key;
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auto waiters = txn3->GetWaitingTxns(&wait_cf_id, &wait_key);
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ASSERT_EQ(wait_cf_id, 1u);
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ASSERT_EQ(wait_key, "k");
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ASSERT_EQ(waiters.size(), 2);
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bool waits_correct =
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(waiters[0] == txn1->GetID() && waiters[1] == txn2->GetID()) ||
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(waiters[1] == txn1->GetID() && waiters[0] == txn2->GetID());
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ASSERT_EQ(waits_correct, true);
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// Release locks so txn3 can proceed with execution
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locker_->UnLock(txn1, 1, "k", env_);
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locker_->UnLock(txn2, 1, "k", env_);
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// Wait until txn3 finishes
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t1.join();
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delete txn1;
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delete txn2;
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delete txn3;
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}
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} // namespace ROCKSDB_NAMESPACE
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