mirror of
https://github.com/ClickHouse/ClickHouse.git
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294 lines
8.2 KiB
C++
294 lines
8.2 KiB
C++
#include <map>
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#include <experimental/optional>
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#include <Poco/Path.h>
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#include <Poco/Util/XMLConfiguration.h>
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#include <DB/Common/escapeForFileName.h>
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#include <DB/Common/Exception.h>
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#include <DB/IO/ReadBufferFromFile.h>
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#include <DB/IO/WriteBufferFromFile.h>
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#include <DB/IO/CompressedReadBufferFromFile.h>
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#include <DB/IO/CompressedWriteBuffer.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/DataTypes/DataTypeArray.h>
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#include <DB/DataTypes/DataTypeNested.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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#include <DB/DataStreams/IBlockOutputStream.h>
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#include <DB/DataStreams/NativeBlockInputStream.h>
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#include <DB/DataStreams/NativeBlockOutputStream.h>
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#include <DB/DataStreams/NullBlockInputStream.h>
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#include <DB/Columns/ColumnArray.h>
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#include <DB/Storages/StorageStripeLog.h>
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#include <Poco/DirectoryIterator.h>
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namespace DB
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{
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#define INDEX_BUFFER_SIZE 4096
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namespace ErrorCodes
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{
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extern const int EMPTY_LIST_OF_COLUMNS_PASSED;
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extern const int CANNOT_CREATE_DIRECTORY;
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}
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class StripeLogBlockInputStream : public IProfilingBlockInputStream
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{
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public:
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StripeLogBlockInputStream(const NameSet & column_names_, StorageStripeLog & storage_, size_t max_read_buffer_size_,
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std::shared_ptr<const IndexForNativeFormat> & index_,
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IndexForNativeFormat::Blocks::const_iterator index_begin_,
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IndexForNativeFormat::Blocks::const_iterator index_end_)
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: storage(storage_), max_read_buffer_size(max_read_buffer_size_),
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index(index_), index_begin(index_begin_), index_end(index_end_)
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{
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}
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String getName() const override { return "StripeLog"; }
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String getID() const override
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{
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std::stringstream s;
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s << this;
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return s.str();
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}
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protected:
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Block readImpl() override
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{
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Block res;
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if (!started)
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{
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started = true;
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data_in.emplace(
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storage.full_path() + "data.bin", 0, 0,
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std::min(max_read_buffer_size, Poco::File(storage.full_path() + "data.bin").getSize()));
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block_in.emplace(*data_in, 0, true, index_begin, index_end);
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}
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if (block_in)
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{
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res = block_in->read();
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/// Освобождаем память раньше уничтожения объекта.
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if (!res)
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{
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block_in = std::experimental::nullopt;
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data_in = std::experimental::nullopt;
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index.reset();
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}
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}
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return res;
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}
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private:
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StorageStripeLog & storage;
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size_t max_read_buffer_size;
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std::shared_ptr<const IndexForNativeFormat> index;
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IndexForNativeFormat::Blocks::const_iterator index_begin;
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IndexForNativeFormat::Blocks::const_iterator index_end;
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/** optional - чтобы создавать объекты только при первом чтении
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* и удалять объекты (освобождать буферы) после исчерпания источника
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* - для экономии оперативки при использовании большого количества источников.
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*/
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bool started = false;
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std::experimental::optional<CompressedReadBufferFromFile> data_in;
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std::experimental::optional<NativeBlockInputStream> block_in;
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};
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class StripeLogBlockOutputStream : public IBlockOutputStream
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{
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public:
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StripeLogBlockOutputStream(StorageStripeLog & storage_)
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: storage(storage_), lock(storage.rwlock),
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data_out_compressed(storage.full_path() + "data.bin", DBMS_DEFAULT_BUFFER_SIZE, O_WRONLY | O_APPEND | O_CREAT),
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data_out(data_out_compressed, CompressionMethod::LZ4, storage.max_compress_block_size),
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index_out_compressed(storage.full_path() + "index.mrk", INDEX_BUFFER_SIZE, O_WRONLY | O_APPEND | O_CREAT),
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index_out(index_out_compressed),
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block_out(data_out, 0, &index_out, Poco::File(storage.full_path() + "data.bin").getSize())
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{
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}
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~StripeLogBlockOutputStream()
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{
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try
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{
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writeSuffix();
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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}
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}
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void write(const Block & block) override
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{
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block_out.write(block);
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}
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void writeSuffix() override
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{
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if (done)
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return;
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block_out.writeSuffix();
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data_out.next();
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data_out_compressed.next();
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index_out.next();
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index_out_compressed.next();
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FileChecker::Files files{ data_out_compressed.getFileName(), index_out_compressed.getFileName() };
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storage.file_checker.update(files.begin(), files.end());
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done = true;
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}
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private:
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StorageStripeLog & storage;
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Poco::ScopedWriteRWLock lock;
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WriteBufferFromFile data_out_compressed;
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CompressedWriteBuffer data_out;
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WriteBufferFromFile index_out_compressed;
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CompressedWriteBuffer index_out;
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NativeBlockOutputStream block_out;
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bool done = false;
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};
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StorageStripeLog::StorageStripeLog(
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const std::string & path_,
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const std::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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bool attach,
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size_t max_compress_block_size_)
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: IStorage{materialized_columns_, alias_columns_, column_defaults_},
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path(path_), name(name_), columns(columns_),
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max_compress_block_size(max_compress_block_size_),
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file_checker(path + escapeForFileName(name) + '/' + "sizes.json"),
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log(&Logger::get("StorageStripeLog"))
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{
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if (columns->empty())
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throw Exception("Empty list of columns passed to StorageStripeLog constructor", ErrorCodes::EMPTY_LIST_OF_COLUMNS_PASSED);
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String full_path = path + escapeForFileName(name) + '/';
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if (!attach)
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{
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/// создаём файлы, если их нет
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if (0 != mkdir(full_path.c_str(), S_IRWXU | S_IRWXG | S_IRWXO) && errno != EEXIST)
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throwFromErrno("Cannot create directory " + full_path, ErrorCodes::CANNOT_CREATE_DIRECTORY);
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}
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}
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StoragePtr StorageStripeLog::create(
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const std::string & path_,
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const std::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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bool attach,
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size_t max_compress_block_size_)
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{
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return make_shared(
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path_, name_, columns_,
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materialized_columns_, alias_columns_, column_defaults_,
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attach, max_compress_block_size_
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);
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}
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void StorageStripeLog::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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Poco::ScopedWriteRWLock lock(rwlock);
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/// Переименовываем директорию с данными.
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Poco::File(path + escapeForFileName(name)).renameTo(new_path_to_db + escapeForFileName(new_table_name));
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path = new_path_to_db;
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name = new_table_name;
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file_checker.setPath(path + escapeForFileName(name) + "/" + "sizes.json");
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}
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BlockInputStreams StorageStripeLog::read(
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const Names & column_names,
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ASTPtr query,
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const Context & context,
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const Settings & settings,
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QueryProcessingStage::Enum & processed_stage,
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const size_t max_block_size,
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unsigned threads)
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{
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Poco::ScopedReadRWLock lock(rwlock);
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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NameSet column_names_set(column_names.begin(), column_names.end());
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if (!Poco::File(full_path() + "index.mrk").exists())
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return { std::make_shared<NullBlockInputStream>() };
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CompressedReadBufferFromFile index_in(full_path() + "index.mrk", 0, 0, INDEX_BUFFER_SIZE);
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std::shared_ptr<const IndexForNativeFormat> index{std::make_shared<IndexForNativeFormat>(index_in, column_names_set)};
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BlockInputStreams res;
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size_t size = index->blocks.size();
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if (threads > size)
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threads = size;
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for (size_t thread = 0; thread < threads; ++thread)
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{
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IndexForNativeFormat::Blocks::const_iterator begin = index->blocks.begin();
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IndexForNativeFormat::Blocks::const_iterator end = index->blocks.begin();
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std::advance(begin, thread * size / threads);
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std::advance(end, (thread + 1) * size / threads);
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res.emplace_back(std::make_shared<StripeLogBlockInputStream>(column_names_set, *this, settings.max_read_buffer_size, index, begin, end));
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}
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/// Непосредственно во время чтения не держим read lock, потому что мы читаем диапазоны данных, которые не меняются.
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return res;
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}
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BlockOutputStreamPtr StorageStripeLog::write(
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ASTPtr query, const Settings & settings)
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{
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return std::make_shared<StripeLogBlockOutputStream>(*this);
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}
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bool StorageStripeLog::checkData() const
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{
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Poco::ScopedReadRWLock lock(const_cast<Poco::RWLock &>(rwlock));
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return file_checker.check();
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}
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}
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