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https://github.com/ClickHouse/ClickHouse.git
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322 lines
10 KiB
C++
322 lines
10 KiB
C++
#include <Storages/MergeTree/MergeTreeWriteAheadLog.h>
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#include <Storages/MergeTree/MergeTreeDataPartInMemory.h>
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#include <Storages/MergeTree/MergeTreeData.h>
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#include <Storages/MergeTree/MergeTreeDataWriter.h>
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#include <Storages/MergeTree/MergedBlockOutputStream.h>
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#include <IO/MemoryReadWriteBuffer.h>
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#include <IO/ReadHelpers.h>
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#include <IO/copyData.h>
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#include <Poco/JSON/JSON.h>
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#include <Poco/JSON/Object.h>
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#include <Poco/JSON/Stringifier.h>
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#include <Poco/JSON/Parser.h>
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#include <sys/time.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int UNKNOWN_FORMAT_VERSION;
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extern const int CANNOT_READ_ALL_DATA;
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extern const int BAD_DATA_PART_NAME;
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extern const int CORRUPTED_DATA;
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}
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MergeTreeWriteAheadLog::MergeTreeWriteAheadLog(
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MergeTreeData & storage_,
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const DiskPtr & disk_,
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const String & name_)
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: storage(storage_)
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, disk(disk_)
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, name(name_)
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, path(storage.getRelativeDataPath() + name_)
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, pool(storage.getContext()->getSchedulePool())
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, log(&Poco::Logger::get(storage.getLogName() + " (WriteAheadLog)"))
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{
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init();
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sync_task = pool.createTask("MergeTreeWriteAheadLog::sync", [this]
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{
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std::lock_guard lock(write_mutex);
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out->sync();
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sync_scheduled = false;
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sync_cv.notify_all();
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});
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}
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MergeTreeWriteAheadLog::~MergeTreeWriteAheadLog()
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{
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std::unique_lock lock(write_mutex);
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if (sync_scheduled)
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sync_cv.wait(lock, [this] { return !sync_scheduled; });
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}
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void MergeTreeWriteAheadLog::init()
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{
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out = disk->writeFile(path, DBMS_DEFAULT_BUFFER_SIZE, WriteMode::Append);
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/// Small hack: in NativeBlockOutputStream header is used only in `getHeader` method.
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/// To avoid complex logic of changing it during ALTERs we leave it empty.
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block_out = std::make_unique<NativeWriter>(*out, 0, Block{});
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min_block_number = std::numeric_limits<Int64>::max();
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max_block_number = -1;
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bytes_at_last_sync = 0;
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}
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void MergeTreeWriteAheadLog::addPart(DataPartInMemoryPtr & part)
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{
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std::unique_lock lock(write_mutex);
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auto part_info = MergeTreePartInfo::fromPartName(part->name, storage.format_version);
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min_block_number = std::min(min_block_number, part_info.min_block);
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max_block_number = std::max(max_block_number, part_info.max_block);
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writeIntBinary(WAL_VERSION, *out);
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ActionMetadata metadata{};
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metadata.part_uuid = part->uuid;
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metadata.write(*out);
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writeIntBinary(static_cast<UInt8>(ActionType::ADD_PART), *out);
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writeStringBinary(part->name, *out);
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block_out->write(part->block);
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block_out->flush();
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sync(lock);
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auto max_wal_bytes = storage.getSettings()->write_ahead_log_max_bytes;
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if (out->count() > max_wal_bytes)
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rotate(lock);
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}
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void MergeTreeWriteAheadLog::dropPart(const String & part_name)
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{
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std::unique_lock lock(write_mutex);
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writeIntBinary(WAL_VERSION, *out);
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ActionMetadata metadata{};
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metadata.write(*out);
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writeIntBinary(static_cast<UInt8>(ActionType::DROP_PART), *out);
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writeStringBinary(part_name, *out);
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out->next();
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sync(lock);
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}
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void MergeTreeWriteAheadLog::rotate(const std::unique_lock<std::mutex> &)
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{
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String new_name = String(WAL_FILE_NAME) + "_"
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+ toString(min_block_number) + "_"
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+ toString(max_block_number) + WAL_FILE_EXTENSION;
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disk->replaceFile(path, storage.getRelativeDataPath() + new_name);
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init();
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}
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MergeTreeData::MutableDataPartsVector MergeTreeWriteAheadLog::restore(const StorageMetadataPtr & metadata_snapshot, ContextPtr context)
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{
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std::unique_lock lock(write_mutex);
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MergeTreeData::MutableDataPartsVector parts;
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auto in = disk->readFile(path, {});
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NativeReader block_in(*in, 0);
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NameSet dropped_parts;
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while (!in->eof())
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{
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MergeTreeData::MutableDataPartPtr part;
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UInt8 version;
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String part_name;
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Block block;
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ActionType action_type;
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try
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{
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ActionMetadata metadata;
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readIntBinary(version, *in);
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if (version > 0)
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{
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metadata.read(*in);
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}
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readIntBinary(action_type, *in);
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readStringBinary(part_name, *in);
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if (action_type == ActionType::DROP_PART)
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{
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dropped_parts.insert(part_name);
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}
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else if (action_type == ActionType::ADD_PART)
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{
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auto single_disk_volume = std::make_shared<SingleDiskVolume>("volume_" + part_name, disk, 0);
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part = storage.createPart(
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part_name,
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MergeTreeDataPartType::IN_MEMORY,
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MergeTreePartInfo::fromPartName(part_name, storage.format_version),
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single_disk_volume,
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part_name);
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part->uuid = metadata.part_uuid;
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block = block_in.read();
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}
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else
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{
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throw Exception("Unknown action type: " + toString(static_cast<UInt8>(action_type)), ErrorCodes::CORRUPTED_DATA);
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}
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}
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catch (const Exception & e)
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{
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if (e.code() == ErrorCodes::CANNOT_READ_ALL_DATA
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|| e.code() == ErrorCodes::UNKNOWN_FORMAT_VERSION
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|| e.code() == ErrorCodes::BAD_DATA_PART_NAME
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|| e.code() == ErrorCodes::CORRUPTED_DATA)
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{
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LOG_WARNING(log, "WAL file '{}' is broken. {}", path, e.displayText());
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/// If file is broken, do not write new parts to it.
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/// But if it contains any part rotate and save them.
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if (max_block_number == -1)
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disk->removeFile(path);
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else if (name == DEFAULT_WAL_FILE_NAME)
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rotate(lock);
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break;
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}
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throw;
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}
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if (action_type == ActionType::ADD_PART)
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{
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MergedBlockOutputStream part_out(
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part,
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metadata_snapshot,
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block.getNamesAndTypesList(),
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{},
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CompressionCodecFactory::instance().get("NONE", {}));
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part->minmax_idx->update(block, storage.getMinMaxColumnsNames(metadata_snapshot->getPartitionKey()));
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part->partition.create(metadata_snapshot, block, 0, context);
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if (metadata_snapshot->hasSortingKey())
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metadata_snapshot->getSortingKey().expression->execute(block);
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part_out.write(block);
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for (const auto & projection : metadata_snapshot->getProjections())
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{
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auto projection_block = projection.calculate(block, context);
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if (projection_block.rows())
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part->addProjectionPart(
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projection.name,
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MergeTreeDataWriter::writeInMemoryProjectionPart(storage, log, projection_block, projection, part.get()));
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}
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part_out.writeSuffixAndFinalizePart(part);
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min_block_number = std::min(min_block_number, part->info.min_block);
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max_block_number = std::max(max_block_number, part->info.max_block);
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parts.push_back(std::move(part));
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}
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}
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MergeTreeData::MutableDataPartsVector result;
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std::copy_if(parts.begin(), parts.end(), std::back_inserter(result),
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[&dropped_parts](const auto & part) { return dropped_parts.count(part->name) == 0; });
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return result;
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}
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void MergeTreeWriteAheadLog::sync(std::unique_lock<std::mutex> & lock)
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{
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size_t bytes_to_sync = storage.getSettings()->write_ahead_log_bytes_to_fsync;
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time_t time_to_sync = storage.getSettings()->write_ahead_log_interval_ms_to_fsync;
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size_t current_bytes = out->count();
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if (bytes_to_sync && current_bytes - bytes_at_last_sync > bytes_to_sync)
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{
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sync_task->schedule();
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bytes_at_last_sync = current_bytes;
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}
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else if (time_to_sync && !sync_scheduled)
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{
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sync_task->scheduleAfter(time_to_sync);
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sync_scheduled = true;
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}
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if (storage.getSettings()->in_memory_parts_insert_sync)
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sync_cv.wait(lock, [this] { return !sync_scheduled; });
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}
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std::optional<MergeTreeWriteAheadLog::MinMaxBlockNumber>
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MergeTreeWriteAheadLog::tryParseMinMaxBlockNumber(const String & filename)
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{
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Int64 min_block;
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Int64 max_block;
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ReadBufferFromString in(filename);
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if (!checkString(WAL_FILE_NAME, in)
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|| !checkChar('_', in)
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|| !tryReadIntText(min_block, in)
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|| !checkChar('_', in)
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|| !tryReadIntText(max_block, in))
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{
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return {};
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}
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return std::make_pair(min_block, max_block);
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}
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String MergeTreeWriteAheadLog::ActionMetadata::toJSON() const
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{
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Poco::JSON::Object json;
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if (part_uuid != UUIDHelpers::Nil)
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json.set(JSON_KEY_PART_UUID, toString(part_uuid));
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std::ostringstream oss; // STYLE_CHECK_ALLOW_STD_STRING_STREAM
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oss.exceptions(std::ios::failbit);
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json.stringify(oss);
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return oss.str();
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}
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void MergeTreeWriteAheadLog::ActionMetadata::fromJSON(const String & buf)
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{
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Poco::JSON::Parser parser;
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auto json = parser.parse(buf).extract<Poco::JSON::Object::Ptr>();
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if (json->has(JSON_KEY_PART_UUID))
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part_uuid = parseFromString<UUID>(json->getValue<std::string>(JSON_KEY_PART_UUID));
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}
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void MergeTreeWriteAheadLog::ActionMetadata::read(ReadBuffer & meta_in)
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{
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readIntBinary(min_compatible_version, meta_in);
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if (min_compatible_version > WAL_VERSION)
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throw Exception("WAL metadata version " + toString(min_compatible_version)
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+ " is not compatible with this ClickHouse version", ErrorCodes::UNKNOWN_FORMAT_VERSION);
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size_t metadata_size;
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readVarUInt(metadata_size, meta_in);
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if (metadata_size == 0)
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return;
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String buf(metadata_size, ' ');
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meta_in.readStrict(buf.data(), metadata_size);
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fromJSON(buf);
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}
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void MergeTreeWriteAheadLog::ActionMetadata::write(WriteBuffer & meta_out) const
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{
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writeIntBinary(min_compatible_version, meta_out);
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String ser_meta = toJSON();
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writeVarUInt(static_cast<UInt32>(ser_meta.length()), meta_out);
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writeString(ser_meta, meta_out);
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}
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}
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