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144 lines
4.5 KiB
C++
144 lines
4.5 KiB
C++
#include <DB/Storages/StorageSet.h>
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#include <DB/IO/ReadBufferFromFile.h>
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#include <DB/IO/CompressedReadBuffer.h>
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#include <DB/DataStreams/NativeBlockInputStream.h>
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#include <DB/Common/escapeForFileName.h>
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namespace DB
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{
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SetOrJoinBlockOutputStream::SetOrJoinBlockOutputStream(StorageSetOrJoinBase & table_,
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const String & backup_path_, const String & backup_tmp_path_, const String & backup_file_name_)
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: table(table_),
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backup_path(backup_path_), backup_tmp_path(backup_tmp_path_),
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backup_file_name(backup_file_name_),
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backup_buf(backup_tmp_path + backup_file_name),
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compressed_backup_buf(backup_buf),
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backup_stream(compressed_backup_buf)
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{
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}
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void SetOrJoinBlockOutputStream::write(const Block & block)
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{
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/// Сортируем столбцы в блоке. Это нужно, так как Set и Join рассчитывают на одинаковый порядок столбцов в разных блоках.
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Block sorted_block = block.sortColumns();
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table.insertBlock(sorted_block);
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backup_stream.write(sorted_block);
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}
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void SetOrJoinBlockOutputStream::writeSuffix()
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{
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backup_stream.flush();
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compressed_backup_buf.next();
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backup_buf.next();
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Poco::File(backup_tmp_path + backup_file_name).renameTo(backup_path + backup_file_name);
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}
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BlockOutputStreamPtr StorageSetOrJoinBase::write(ASTPtr query)
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{
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++increment;
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return new SetOrJoinBlockOutputStream(*this, path, path + "tmp/", toString(increment) + ".bin");
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}
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StorageSetOrJoinBase::StorageSetOrJoinBase(
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const String & path_,
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const String & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_)
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: IStorage{materialized_columns_, alias_columns_, column_defaults_},
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path(path_ + escapeForFileName(name_) + '/'), name(name_), columns(columns_)
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{
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}
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StorageSet::StorageSet(
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const String & path_,
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const String & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_)
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: StorageSetOrJoinBase{path_, name_, columns_, materialized_columns_, alias_columns_, column_defaults_}
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{
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restore();
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}
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void StorageSetOrJoinBase::restore()
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{
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Poco::File tmp_dir(path + "tmp/");
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if (!tmp_dir.exists())
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{
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tmp_dir.createDirectories();
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return;
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}
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constexpr auto file_suffix = ".bin";
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constexpr auto file_suffix_size = strlen(file_suffix);
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DataTypeFactory data_type_factory;
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Poco::DirectoryIterator dir_end;
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for (Poco::DirectoryIterator dir_it(path); dir_end != dir_it; ++dir_it)
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{
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const auto & name = dir_it.name();
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if (dir_it->isFile()
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&& name.size() > file_suffix_size
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&& 0 == name.compare(name.size() - file_suffix_size, file_suffix_size, file_suffix)
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&& dir_it->getSize() > 0)
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{
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/// Вычисляем максимальный номер имеющихся файлов с бэкапом, чтобы добавлять следующие файлы с большими номерами.
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UInt64 file_num = parse<UInt64>(name.substr(0, name.size() - file_suffix_size));
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if (file_num > increment)
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increment = file_num;
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restoreFromFile(dir_it->path(), data_type_factory);
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}
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}
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}
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void StorageSetOrJoinBase::restoreFromFile(const String & file_path, const DataTypeFactory & data_type_factory)
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{
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ReadBufferFromFile backup_buf(file_path);
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CompressedReadBuffer compressed_backup_buf(backup_buf);
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NativeBlockInputStream backup_stream(compressed_backup_buf, data_type_factory);
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backup_stream.readPrefix();
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while (Block block = backup_stream.read())
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insertBlock(block);
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backup_stream.readSuffix();
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/// TODO Добавить скорость, сжатые байты, объём данных в памяти, коэффициент сжатия... Обобщить всё логгирование статистики в проекте.
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LOG_INFO(&Logger::get("StorageSetOrJoinBase"), std::fixed << std::setprecision(2)
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<< "Loaded from backup file " << file_path << ". "
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<< backup_stream.getInfo().rows << " rows, "
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<< backup_stream.getInfo().bytes / 1048576.0 << " MiB. "
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<< "State has " << getSize() << " unique rows.");
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}
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void StorageSetOrJoinBase::rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name)
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{
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/// Переименовываем директорию с данными.
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String new_path = new_path_to_db + escapeForFileName(new_table_name);
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Poco::File(path).renameTo(new_path);
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path = new_path + "/";
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name = new_table_name;
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}
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}
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