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393 lines
13 KiB
C++
393 lines
13 KiB
C++
#pragma once
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#include <DB/IO/WriteBufferFromFile.h>
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#include <DB/IO/CompressedWriteBuffer.h>
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#include <DB/IO/HashingWriteBuffer.h>
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#include <DB/Storages/MergeTree/MergeTreeData.h>
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#include <DB/Common/escapeForFileName.h>
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#include <DB/DataTypes/DataTypeNested.h>
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#include <DB/DataTypes/DataTypeArray.h>
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namespace DB
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{
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class IMergedBlockOutputStream : public IBlockOutputStream
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{
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public:
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IMergedBlockOutputStream(MergeTreeData & storage_, size_t min_compress_block_size_, size_t max_compress_block_size_) : storage(storage_), index_offset(0), min_compress_block_size(min_compress_block_size_), max_compress_block_size(max_compress_block_size_)
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{
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}
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protected:
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typedef std::set<std::string> OffsetColumns;
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struct ColumnStream
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{
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ColumnStream(const String & escaped_column_name_, const String & data_path, const std::string & marks_path, size_t max_compress_block_size = DEFAULT_MAX_COMPRESS_BLOCK_SIZE) :
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escaped_column_name(escaped_column_name_),
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plain_file(data_path, max_compress_block_size, O_TRUNC | O_CREAT | O_WRONLY),
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plain_hashing(plain_file), compressed_buf(plain_hashing), compressed(compressed_buf),
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marks_file(marks_path, 4096, O_TRUNC | O_CREAT | O_WRONLY), marks(marks_file) {}
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String escaped_column_name;
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/// compressed -> compressed_buf -> plain_hashing -> plain_file
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WriteBufferFromFile plain_file;
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HashingWriteBuffer plain_hashing;
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CompressedWriteBuffer compressed_buf;
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HashingWriteBuffer compressed;
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/// marks -> marks_file
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WriteBufferFromFile marks_file;
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HashingWriteBuffer marks;
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void finalize()
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{
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compressed.next();
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plain_file.next();
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marks.next();
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}
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void sync()
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{
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plain_file.sync();
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marks_file.sync();
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}
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void addToChecksums(MergeTreeData::DataPart::Checksums & checksums, String name = "")
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{
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if (name == "")
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name = escaped_column_name;
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checksums.files[name + ".bin"].is_compressed = true;
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checksums.files[name + ".bin"].uncompressed_size = compressed.count();
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checksums.files[name + ".bin"].uncompressed_hash = compressed.getHash();
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checksums.files[name + ".bin"].file_size = plain_hashing.count();
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checksums.files[name + ".bin"].file_hash = plain_hashing.getHash();
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checksums.files[name + ".mrk"].file_size = marks.count();
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checksums.files[name + ".mrk"].file_hash = marks.getHash();
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}
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};
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typedef std::map<String, std::unique_ptr<ColumnStream> > ColumnStreams;
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void addStream(const String & path, const String & name, const IDataType & type, size_t level = 0, String filename = "")
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{
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String escaped_column_name;
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if (filename.size())
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escaped_column_name = escapeForFileName(filename);
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else
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escaped_column_name = escapeForFileName(name);
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/// Для массивов используются отдельные потоки для размеров.
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if (const DataTypeArray * type_arr = typeid_cast<const DataTypeArray *>(&type))
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{
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String size_name = DataTypeNested::extractNestedTableName(name)
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+ ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
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String escaped_size_name = escapeForFileName(DataTypeNested::extractNestedTableName(name))
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+ ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
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column_streams[size_name].reset(new ColumnStream(
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escaped_size_name,
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path + escaped_size_name + ".bin",
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path + escaped_size_name + ".mrk",
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max_compress_block_size));
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addStream(path, name, *type_arr->getNestedType(), level + 1);
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}
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else
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column_streams[name].reset(new ColumnStream(
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escaped_column_name,
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path + escaped_column_name + ".bin",
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path + escaped_column_name + ".mrk",
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max_compress_block_size));
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}
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/// Записать данные одного столбца.
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void writeData(const String & name, const IDataType & type, const IColumn & column, OffsetColumns & offset_columns, size_t level = 0)
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{
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size_t size = column.size();
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/// Для массивов требуется сначала сериализовать размеры, а потом значения.
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if (const DataTypeArray * type_arr = typeid_cast<const DataTypeArray *>(&type))
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{
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String size_name = DataTypeNested::extractNestedTableName(name)
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+ ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
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if (offset_columns.count(size_name) == 0)
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{
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offset_columns.insert(size_name);
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ColumnStream & stream = *column_streams[size_name];
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size_t prev_mark = 0;
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while (prev_mark < size)
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{
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size_t limit = 0;
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/// Если есть index_offset, то первая засечка идёт не сразу, а после этого количества строк.
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if (prev_mark == 0 && index_offset != 0)
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{
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limit = index_offset;
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}
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else
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{
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limit = storage.index_granularity;
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/// Уже могло накопиться достаточно данных для сжатия в новый блок.
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if (stream.compressed.offset() >= min_compress_block_size)
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stream.compressed.next();
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writeIntBinary(stream.plain_hashing.count(), stream.marks);
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writeIntBinary(stream.compressed.offset(), stream.marks);
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}
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type_arr->serializeOffsets(column, stream.compressed, prev_mark, limit);
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stream.compressed.nextIfAtEnd(); /// Чтобы вместо засечек, указывающих на конец сжатого блока, были засечки, указывающие на начало следующего.
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prev_mark += limit;
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}
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}
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}
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{
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ColumnStream & stream = *column_streams[name];
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size_t prev_mark = 0;
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while (prev_mark < size)
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{
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size_t limit = 0;
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/// Если есть index_offset, то первая засечка идёт не сразу, а после этого количества строк.
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if (prev_mark == 0 && index_offset != 0)
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{
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limit = index_offset;
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}
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else
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{
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limit = storage.index_granularity;
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/// Уже могло накопиться достаточно данных для сжатия в новый блок.
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if (stream.compressed.offset() >= min_compress_block_size)
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stream.compressed.next();
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writeIntBinary(stream.plain_hashing.count(), stream.marks);
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writeIntBinary(stream.compressed.offset(), stream.marks);
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}
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type.serializeBinary(column, stream.compressed, prev_mark, limit);
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stream.compressed.nextIfAtEnd(); /// Чтобы вместо засечек, указывающих на конец сжатого блока, были засечки, указывающие на начало следующего.
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prev_mark += limit;
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}
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}
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}
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MergeTreeData & storage;
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ColumnStreams column_streams;
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/// Смещение до первой строчки блока, для которой надо записать индекс.
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size_t index_offset;
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size_t min_compress_block_size;
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size_t max_compress_block_size;
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};
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/** Для записи одного куска. Данные уже отсортированы, относятся к одному месяцу, и пишутся в один кускок.
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*/
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class MergedBlockOutputStream : public IMergedBlockOutputStream
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{
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public:
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MergedBlockOutputStream(MergeTreeData & storage_, String part_path_, const NamesAndTypesList & columns_list_)
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: IMergedBlockOutputStream(storage_, storage_.context.getSettings().min_compress_block_size, storage_.context.getSettings().max_compress_block_size), columns_list(columns_list_), part_path(part_path_), marks_count(0)
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{
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Poco::File(part_path).createDirectories();
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index_file_stream = new WriteBufferFromFile(part_path + "primary.idx", DBMS_DEFAULT_BUFFER_SIZE, O_TRUNC | O_CREAT | O_WRONLY);
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index_stream = new HashingWriteBuffer(*index_file_stream);
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columns_list = storage.getColumnsList();
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for (const auto & it : columns_list)
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addStream(part_path, it.name, *it.type);
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}
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void write(const Block & block)
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{
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size_t rows = block.rows();
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/// Сначала пишем индекс. Индекс содержит значение Primary Key для каждой index_granularity строки.
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typedef std::vector<const ColumnWithNameAndType *> PrimaryColumns;
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PrimaryColumns primary_columns;
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for (const auto & descr : storage.getSortDescription())
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primary_columns.push_back(
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!descr.column_name.empty()
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? &block.getByName(descr.column_name)
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: &block.getByPosition(descr.column_number));
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for (size_t i = index_offset; i < rows; i += storage.index_granularity)
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{
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for (PrimaryColumns::const_iterator it = primary_columns.begin(); it != primary_columns.end(); ++it)
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{
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index_vec.push_back((*(*it)->column)[i]);
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(*it)->type->serializeBinary(index_vec.back(), *index_stream);
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}
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++marks_count;
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}
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/// Множество записанных столбцов со смещениями, чтобы не писать общие для вложенных структур столбцы несколько раз
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OffsetColumns offset_columns;
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/// Теперь пишем данные.
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for (const auto & it : columns_list)
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{
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const ColumnWithNameAndType & column = block.getByName(it.name);
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writeData(column.name, *column.type, *column.column, offset_columns);
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}
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size_t written_for_last_mark = (storage.index_granularity - index_offset + rows) % storage.index_granularity;
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index_offset = (storage.index_granularity - written_for_last_mark) % storage.index_granularity;
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}
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void writeSuffix() override
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{
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throw Exception("Method writeSuffix is not supported by MergedBlockOutputStream", ErrorCodes::NOT_IMPLEMENTED);
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}
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MergeTreeData::DataPart::Checksums writeSuffixAndGetChecksums()
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{
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/// Заканчиваем запись и достаем чексуммы.
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MergeTreeData::DataPart::Checksums checksums;
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index_stream->next();
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checksums.files["primary.idx"].file_size = index_stream->count();
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checksums.files["primary.idx"].file_hash = index_stream->getHash();
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for (ColumnStreams::iterator it = column_streams.begin(); it != column_streams.end(); ++it)
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{
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it->second->finalize();
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it->second->addToChecksums(checksums);
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}
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index_stream = nullptr;
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column_streams.clear();
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if (marks_count == 0)
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{
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/// Кусок пустой - все записи удалились.
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Poco::File(part_path).remove(true);
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checksums.files.clear();
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}
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else
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{
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/// Записываем файл с чексуммами.
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WriteBufferFromFile out(part_path + "checksums.txt", 1024);
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checksums.writeText(out);
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}
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return checksums;
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}
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MergeTreeData::DataPart::Index & getIndex()
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{
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return index_vec;
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}
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/// Сколько засечек уже записано.
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size_t marksCount()
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{
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return marks_count;
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}
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private:
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NamesAndTypesList columns_list;
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String part_path;
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size_t marks_count;
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SharedPtr<WriteBufferFromFile> index_file_stream;
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SharedPtr<HashingWriteBuffer> index_stream;
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MergeTreeData::DataPart::Index index_vec;
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};
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typedef Poco::SharedPtr<MergedBlockOutputStream> MergedBlockOutputStreamPtr;
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/// Записывает только те, столбцы, что лежат в block
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class MergedColumnOnlyOutputStream : public IMergedBlockOutputStream
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{
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public:
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MergedColumnOnlyOutputStream(MergeTreeData & storage_, String part_path_, bool sync_ = false) :
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IMergedBlockOutputStream(storage_, storage_.context.getSettings().min_compress_block_size, storage_.context.getSettings().max_compress_block_size), part_path(part_path_), initialized(false), sync(sync_)
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{
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}
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void write(const Block & block)
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{
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if (!initialized)
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{
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column_streams.clear();
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for (size_t i = 0; i < block.columns(); ++i)
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{
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addStream(part_path, block.getByPosition(i).name,
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*block.getByPosition(i).type, 0, prefix + block.getByPosition(i).name);
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}
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initialized = true;
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}
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size_t rows = block.rows();
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OffsetColumns offset_columns;
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for (size_t i = 0; i < block.columns(); ++i)
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{
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const ColumnWithNameAndType & column = block.getByPosition(i);
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writeData(column.name, *column.type, *column.column, offset_columns);
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}
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size_t written_for_last_mark = (storage.index_granularity - index_offset + rows) % storage.index_granularity;
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index_offset = (storage.index_granularity - written_for_last_mark) % storage.index_granularity;
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}
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void writeSuffix() override
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{
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throw Exception("Method writeSuffix is not supported by MergedColumnOnlyOutputStream", ErrorCodes::NOT_IMPLEMENTED);
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}
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MergeTreeData::DataPart::Checksums writeSuffixAndGetChecksums()
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{
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MergeTreeData::DataPart::Checksums checksums;
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for (auto & column_stream : column_streams)
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{
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column_stream.second->finalize();
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if (sync)
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column_stream.second->sync();
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std::string column = escapeForFileName(column_stream.first);
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column_stream.second->addToChecksums(checksums, column);
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Poco::File(part_path + prefix + column + ".bin").renameTo(part_path + column + ".bin");
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Poco::File(part_path + prefix + column + ".mrk").renameTo(part_path + column + ".mrk");
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}
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column_streams.clear();
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initialized = false;
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return checksums;
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}
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private:
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String part_path;
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bool initialized;
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const std::string prefix = "tmp_";
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bool sync;
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};
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}
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