Question

我有一个简单的rocksdb程序，在其中创建一个数据库，并使用事务在其中添加一些值。

using namespace rocksdb;

std::string kDBPath = "D:\\Newdata";
int main() {
    // open DB
    Options options;
    TransactionDBOptions txn_db_options;
    options.create_if_missing = true;
    TransactionDB* txn_db;

    Status s = TransactionDB::Open(options, txn_db_options, kDBPath, &txn_db);
    assert(s.ok());

    WriteOptions write_options;
    ReadOptions read_options;
    TransactionOptions txn_options;
    std::string value;

    ////////////////////////////////////////////////////////
    //
    // Simple Transaction Example ("Read Committed")
    //
    ////////////////////////////////////////////////////////

    // Start a transaction
    Transaction* txn = txn_db->BeginTransaction(write_options);
    assert(txn);

    // Read a key in this transaction
    //s = txn->Get(read_options, "abc", &value);
    //assert(s.IsNotFound());

    // Write a key in this transaction
    s = txn->Put("abc", "def");
    assert(s.ok());

    // Read a key OUTSIDE this transaction. Does not affect txn.
    s = txn_db->Get(read_options, "abc", &value);
    assert(s.IsNotFound());

    // Write a key OUTSIDE of this transaction.
    // Does not affect txn since this is an unrelated key.
    s = txn_db->Put(write_options, "xyz", "zzz");
    assert(s.ok());

    // Write a key OUTSIDE of this transaction.
    // Fail because the key conflicts with the key written in txn.
    s = txn_db->Put(write_options, "abc", "def");
    assert(s.subcode() == Status::kLockTimeout);

    // Value for key "xyz" has been committed, can be read in txn.
    s = txn->Get(read_options, "xyz", &value);
    assert(s.ok());
    assert(value == "zzz");

    // Commit transaction
    s = txn->Commit();
    assert(s.ok());
    std::cout << "End program";
    return 0;
}

首先失败Put。错误：

Exception thrown at 0x00007FF7FCAD0D84 in Rocksdbtest.exe: 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.
Unhandled exception thrown: read access violation.
txn->**** was 0xFFFFFFFFFFFFFF27.

使用VS进行调试会显示<Unable to read memory>的{{1}}字段的name。 VS更新之前，同一程序运行良好。

RocksDB：引发未处理的异常：读取访问冲突

0 个答案: