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#include "catch.hpp"
#include "duckdb/common/file_system.hpp"
#include "test_helpers.hpp"
#include "duckdb/common/local_file_system.hpp"
using namespace duckdb;
using namespace std;
static idx_t GetWALFileSize(FileSystem &fs, const string &path) {
auto handle = fs.OpenFile(path, FileFlags::FILE_FLAGS_READ);
return fs.GetFileSize(*handle);
}
static void TruncateWAL(FileSystem &fs, const string &path, idx_t new_size) {
auto handle = fs.OpenFile(path, FileFlags::FILE_FLAGS_WRITE);
fs.Truncate(*handle, new_size);
}
TEST_CASE("Test torn WAL writes", "[storage][.]") {
auto config = GetTestConfig();
duckdb::unique_ptr<QueryResult> result;
auto storage_database = TestCreatePath("storage_test");
auto storage_wal = storage_database + ".wal";
LocalFileSystem lfs;
config->options.checkpoint_wal_size = idx_t(-1);
config->options.checkpoint_on_shutdown = false;
config->options.abort_on_wal_failure = false;
idx_t wal_size_one_table;
idx_t wal_size_two_table;
// obtain the size of the WAL when writing one table, and then when writing two tables
DeleteDatabase(storage_database);
{
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE A (a INTEGER);"));
wal_size_one_table = GetWALFileSize(lfs, storage_wal);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE B (a INTEGER);"));
wal_size_two_table = GetWALFileSize(lfs, storage_wal);
}
DeleteDatabase(storage_database);
// now for all sizes in between these two sizes we have a torn write
// try all of the possible sizes and truncate the WAL
for (idx_t i = wal_size_one_table + 1; i < wal_size_two_table; i++) {
DeleteDatabase(storage_database);
{
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE A (a INTEGER);"));
REQUIRE_NO_FAIL(con.Query("CREATE TABLE B (a INTEGER);"));
}
TruncateWAL(lfs, storage_wal, i);
{
// reload and make sure table A is there, and table B is not there
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("FROM A"));
REQUIRE_FAIL(con.Query("FROM B"));
}
}
DeleteDatabase(storage_database);
}
TEST_CASE("Test torn WAL writes followed by successful commits", "[storage][.]") {
auto config = GetTestConfig();
duckdb::unique_ptr<QueryResult> result;
auto storage_database = TestCreatePath("storage_test");
auto storage_wal = storage_database + ".wal";
LocalFileSystem lfs;
config->options.checkpoint_wal_size = idx_t(-1);
config->options.checkpoint_on_shutdown = false;
config->options.abort_on_wal_failure = false;
idx_t wal_size_one_table;
// obtain the size of the WAL when writing one table, and then when writing two tables
DeleteDatabase(storage_database);
{
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE A (a INTEGER);"));
wal_size_one_table = GetWALFileSize(lfs, storage_wal);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE B (a INTEGER);"));
}
DeleteDatabase(storage_database);
DeleteDatabase(storage_database);
{
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE A (a INTEGER);"));
REQUIRE_NO_FAIL(con.Query("CREATE TABLE B (a INTEGER);"));
}
TruncateWAL(lfs, storage_wal, wal_size_one_table + 17);
{
// reload and make sure table A is there, and table B is not there
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("FROM A"));
REQUIRE_FAIL(con.Query("FROM B"));
// create table C
REQUIRE_NO_FAIL(con.Query("CREATE TABLE C (a INTEGER);"));
}
{
// reload and make sure table A and C are there, and table B is not
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("FROM A"));
REQUIRE_FAIL(con.Query("FROM B"));
REQUIRE_NO_FAIL(con.Query("FROM C"));
}
DeleteDatabase(storage_database);
}
static void FlipWALByte(FileSystem &fs, const string &path, idx_t byte_pos) {
auto handle = fs.OpenFile(path, FileFlags::FILE_FLAGS_WRITE | FileFlags::FILE_FLAGS_READ);
auto wal_size = handle->GetFileSize();
auto wal_contents = duckdb::unique_ptr<data_t[]>(new data_t[wal_size]);
handle->Read(QueryContext(), wal_contents.get(), wal_size, 0);
wal_contents[byte_pos]++;
handle->Write(QueryContext(), wal_contents.get(), wal_size, 0);
}
TEST_CASE("Test WAL checksums", "[storage][.]") {
auto config = GetTestConfig();
duckdb::unique_ptr<QueryResult> result;
auto storage_database = TestCreatePath("wal_checksum");
auto storage_wal = storage_database + ".wal";
LocalFileSystem lfs;
config->options.checkpoint_wal_size = idx_t(-1);
config->options.checkpoint_on_shutdown = false;
config->options.abort_on_wal_failure = false;
idx_t wal_size_one_table;
idx_t wal_size_two_table;
// obtain the size of the WAL when writing one table, and then when writing two tables
DeleteDatabase(storage_database);
{
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE A (a INTEGER);"));
wal_size_one_table = GetWALFileSize(lfs, storage_wal);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE B (a INTEGER);"));
wal_size_two_table = GetWALFileSize(lfs, storage_wal);
}
DeleteDatabase(storage_database);
// now for all sizes in between these two sizes we have a torn write
// try all of the possible sizes and truncate the WAL
for (idx_t i = wal_size_one_table + 1; i < wal_size_two_table; i++) {
DeleteDatabase(storage_database);
{
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("CREATE TABLE A (a INTEGER);"));
REQUIRE_NO_FAIL(con.Query("CREATE TABLE B (a INTEGER);"));
}
FlipWALByte(lfs, storage_wal, i);
{
// flipping a byte in the checksum leads to an IOException
// flipping a byte in the size of a WAL entry leads to a torn write
// we succeed on either of these cases here
try {
DuckDB db(storage_database, config.get());
Connection con(db);
REQUIRE_NO_FAIL(con.Query("FROM A"));
REQUIRE_FAIL(con.Query("FROM B"));
} catch (std::exception &ex) {
ErrorData error(ex);
if (error.Type() == ExceptionType::IO) {
REQUIRE(1 == 1);
} else {
throw;
}
}
}
}
DeleteDatabase(storage_database);
}
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