ClickHouse/src/Storages/StorageSet.cpp
2020-04-23 17:31:37 +03:00

226 lines
6.7 KiB
C++

#include <Storages/StorageSet.h>
#include <Storages/StorageFactory.h>
#include <IO/ReadBufferFromFile.h>
#include <Compression/CompressedReadBuffer.h>
#include <IO/WriteBufferFromFile.h>
#include <Compression/CompressedWriteBuffer.h>
#include <DataStreams/NativeBlockOutputStream.h>
#include <DataStreams/NativeBlockInputStream.h>
#include <Common/escapeForFileName.h>
#include <Common/StringUtils/StringUtils.h>
#include <Interpreters/Set.h>
#include <Poco/DirectoryIterator.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace ErrorCodes
{
extern const int INCORRECT_FILE_NAME;
}
class SetOrJoinBlockOutputStream : public IBlockOutputStream
{
public:
SetOrJoinBlockOutputStream(StorageSetOrJoinBase & table_,
const String & backup_path_, const String & backup_tmp_path_, const String & backup_file_name_);
Block getHeader() const override { return table.getSampleBlock(); }
void write(const Block & block) override;
void writeSuffix() override;
private:
StorageSetOrJoinBase & table;
String backup_path;
String backup_tmp_path;
String backup_file_name;
WriteBufferFromFile backup_buf;
CompressedWriteBuffer compressed_backup_buf;
NativeBlockOutputStream backup_stream;
};
SetOrJoinBlockOutputStream::SetOrJoinBlockOutputStream(StorageSetOrJoinBase & table_,
const String & backup_path_, const String & backup_tmp_path_, const String & backup_file_name_)
: table(table_),
backup_path(backup_path_), backup_tmp_path(backup_tmp_path_),
backup_file_name(backup_file_name_),
backup_buf(backup_tmp_path + backup_file_name),
compressed_backup_buf(backup_buf),
backup_stream(compressed_backup_buf, 0, table.getSampleBlock())
{
}
void SetOrJoinBlockOutputStream::write(const Block & block)
{
/// Sort columns in the block. This is necessary, since Set and Join count on the same column order in different blocks.
Block sorted_block = block.sortColumns();
table.insertBlock(sorted_block);
backup_stream.write(sorted_block);
}
void SetOrJoinBlockOutputStream::writeSuffix()
{
table.finishInsert();
backup_stream.flush();
compressed_backup_buf.next();
backup_buf.next();
Poco::File(backup_tmp_path + backup_file_name).renameTo(backup_path + backup_file_name);
}
BlockOutputStreamPtr StorageSetOrJoinBase::write(const ASTPtr & /*query*/, const Context & /*context*/)
{
UInt64 id = ++increment;
return std::make_shared<SetOrJoinBlockOutputStream>(*this, path, path + "tmp/", toString(id) + ".bin");
}
StorageSetOrJoinBase::StorageSetOrJoinBase(
const String & relative_path_,
const StorageID & table_id_,
const ColumnsDescription & columns_,
const ConstraintsDescription & constraints_,
const Context & context_)
: IStorage(table_id_)
{
setColumns(columns_);
setConstraints(constraints_);
if (relative_path_.empty())
throw Exception("Join and Set storages require data path", ErrorCodes::INCORRECT_FILE_NAME);
base_path = context_.getPath();
path = base_path + relative_path_;
}
StorageSet::StorageSet(
const String & relative_path_,
const StorageID & table_id_,
const ColumnsDescription & columns_,
const ConstraintsDescription & constraints_,
const Context & context_)
: StorageSetOrJoinBase{relative_path_, table_id_, columns_, constraints_, context_},
set(std::make_shared<Set>(SizeLimits(), false, true))
{
Block header = getSampleBlock();
header = header.sortColumns();
set->setHeader(header);
restore();
}
void StorageSet::insertBlock(const Block & block) { set->insertFromBlock(block); }
void StorageSet::finishInsert() { set->finishInsert(); }
size_t StorageSet::getSize() const { return set->getTotalRowCount(); }
void StorageSet::truncate(const ASTPtr &, const Context &, TableStructureWriteLockHolder &)
{
Poco::File(path).remove(true);
Poco::File(path).createDirectories();
Poco::File(path + "tmp/").createDirectories();
Block header = getSampleBlock();
header = header.sortColumns();
increment = 0;
set = std::make_shared<Set>(SizeLimits(), false, true);
set->setHeader(header);
}
void StorageSetOrJoinBase::restore()
{
Poco::File tmp_dir(path + "tmp/");
if (!tmp_dir.exists())
{
tmp_dir.createDirectories();
return;
}
static const char * file_suffix = ".bin";
static const auto file_suffix_size = strlen(".bin");
Poco::DirectoryIterator dir_end;
for (Poco::DirectoryIterator dir_it(path); dir_end != dir_it; ++dir_it)
{
const auto & name = dir_it.name();
if (dir_it->isFile()
&& endsWith(name, file_suffix)
&& dir_it->getSize() > 0)
{
/// Calculate the maximum number of available files with a backup to add the following files with large numbers.
UInt64 file_num = parse<UInt64>(name.substr(0, name.size() - file_suffix_size));
if (file_num > increment)
increment = file_num;
restoreFromFile(dir_it->path());
}
}
}
void StorageSetOrJoinBase::restoreFromFile(const String & file_path)
{
ReadBufferFromFile backup_buf(file_path);
CompressedReadBuffer compressed_backup_buf(backup_buf);
NativeBlockInputStream backup_stream(compressed_backup_buf, 0);
backup_stream.readPrefix();
while (Block block = backup_stream.read())
insertBlock(block);
finishInsert();
backup_stream.readSuffix();
/// TODO Add speed, compressed bytes, data volume in memory, compression ratio ... Generalize all statistics logging in project.
LOG_INFO(&Logger::get("StorageSetOrJoinBase"), std::fixed << std::setprecision(2)
<< "Loaded from backup file " << file_path << ". "
<< backup_stream.getProfileInfo().rows << " rows, "
<< backup_stream.getProfileInfo().bytes / 1048576.0 << " MiB. "
<< "State has " << getSize() << " unique rows.");
}
void StorageSetOrJoinBase::rename(const String & new_path_to_table_data, const StorageID & new_table_id)
{
/// Rename directory with data.
String new_path = base_path + new_path_to_table_data;
Poco::File(path).renameTo(new_path);
path = new_path;
renameInMemory(new_table_id);
}
void registerStorageSet(StorageFactory & factory)
{
factory.registerStorage("Set", [](const StorageFactory::Arguments & args)
{
if (!args.engine_args.empty())
throw Exception(
"Engine " + args.engine_name + " doesn't support any arguments (" + toString(args.engine_args.size()) + " given)",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return StorageSet::create(args.relative_data_path, args.table_id, args.columns, args.constraints, args.context);
});
}
}