ClickHouse/src/Storages/MergeTree/MergeTreeDataPartInMemory.cpp

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#include <Storages/MergeTree/MergeTreeDataPartInMemory.h>
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#include <Storages/MergeTree/MergeTreeReaderInMemory.h>
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#include <Storages/MergeTree/MergedBlockOutputStream.h>
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#include <Storages/MergeTree/MergeTreeDataPartWriterInMemory.h>
#include <Storages/MergeTree/IMergeTreeReader.h>
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#include <Storages/MergeTree/LoadedMergeTreeDataPartInfoForReader.h>
#include <Storages/MergeTree/DataPartStorageOnDiskFull.h>
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#include <DataTypes/NestedUtils.h>
#include <Disks/createVolume.h>
#include <Interpreters/Context.h>
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#include <Poco/Logger.h>
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#include <Common/logger_useful.h>
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namespace DB
{
namespace ErrorCodes
{
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extern const int DIRECTORY_ALREADY_EXISTS;
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}
MergeTreeDataPartInMemory::MergeTreeDataPartInMemory(
const MergeTreeData & storage_,
const String & name_,
const MergeTreePartInfo & info_,
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const MutableDataPartStoragePtr & data_part_storage_,
const IMergeTreeDataPart * parent_part_)
: IMergeTreeDataPart(storage_, name_, info_, data_part_storage_, Type::InMemory, parent_part_)
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{
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default_codec = CompressionCodecFactory::instance().get("NONE", {});
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}
IMergeTreeDataPart::MergeTreeReaderPtr MergeTreeDataPartInMemory::getReader(
const NamesAndTypesList & columns_to_read,
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const StorageMetadataPtr & metadata_snapshot,
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const MarkRanges & mark_ranges,
UncompressedCache * /* uncompressed_cache */,
MarkCache * /* mark_cache */,
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const AlterConversionsPtr & alter_conversions,
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const MergeTreeReaderSettings & reader_settings,
const ValueSizeMap & /* avg_value_size_hints */,
const ReadBufferFromFileBase::ProfileCallback & /* profile_callback */) const
{
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auto read_info = std::make_shared<LoadedMergeTreeDataPartInfoForReader>(shared_from_this(), alter_conversions);
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auto ptr = std::static_pointer_cast<const MergeTreeDataPartInMemory>(shared_from_this());
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return std::make_unique<MergeTreeReaderInMemory>(
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read_info, ptr, columns_to_read, metadata_snapshot, mark_ranges, reader_settings);
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}
IMergeTreeDataPart::MergeTreeWriterPtr MergeTreeDataPartInMemory::getWriter(
const NamesAndTypesList & columns_list,
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const StorageMetadataPtr & metadata_snapshot,
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const std::vector<MergeTreeIndexPtr> & /* indices_to_recalc */,
const CompressionCodecPtr & /* default_codec */,
const MergeTreeWriterSettings & writer_settings,
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const MergeTreeIndexGranularity & /* computed_index_granularity */)
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{
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auto ptr = std::static_pointer_cast<MergeTreeDataPartInMemory>(shared_from_this());
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return std::make_unique<MergeTreeDataPartWriterInMemory>(
ptr, columns_list, metadata_snapshot, writer_settings);
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}
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MutableDataPartStoragePtr MergeTreeDataPartInMemory::flushToDisk(const String & new_relative_path, const StorageMetadataPtr & metadata_snapshot) const
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{
auto reservation = storage.reserveSpace(block.bytes(), getDataPartStorage());
VolumePtr volume = storage.getStoragePolicy()->getVolume(0);
VolumePtr data_part_volume = createVolumeFromReservation(reservation, volume);
auto new_data_part = storage.getDataPartBuilder(name, data_part_volume, new_relative_path)
.withPartFormat(storage.choosePartFormatOnDisk(block.bytes(), rows_count))
.build();
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auto new_data_part_storage = new_data_part->getDataPartStoragePtr();
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new_data_part_storage->beginTransaction();
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new_data_part->uuid = uuid;
new_data_part->setColumns(columns, {}, metadata_snapshot->getMetadataVersion());
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new_data_part->partition.value = partition.value;
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new_data_part->minmax_idx = minmax_idx;
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if (new_data_part_storage->exists())
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{
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throw Exception(
ErrorCodes::DIRECTORY_ALREADY_EXISTS,
"Could not flush part {}. Part in {} already exists",
quoteString(getDataPartStorage().getFullPath()),
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new_data_part_storage->getFullPath());
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}
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new_data_part_storage->createDirectories();
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auto compression_codec = storage.getContext()->chooseCompressionCodec(0, 0);
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auto indices = MergeTreeIndexFactory::instance().getMany(metadata_snapshot->getSecondaryIndices());
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MergedBlockOutputStream out(new_data_part, metadata_snapshot, columns, indices, compression_codec, NO_TRANSACTION_PTR);
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out.write(block);
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const auto & projections = metadata_snapshot->getProjections();
for (const auto & [projection_name, projection] : projection_parts)
{
if (projections.has(projection_name))
{
auto old_projection_part = asInMemoryPart(projection);
auto new_projection_part = new_data_part->getProjectionPartBuilder(projection_name)
.withPartFormat(storage.choosePartFormatOnDisk(old_projection_part->block.bytes(), rows_count))
.build();
new_projection_part->is_temp = false; // clean up will be done on parent part
new_projection_part->setColumns(projection->getColumns(), {}, metadata_snapshot->getMetadataVersion());
auto new_projection_part_storage = new_projection_part->getDataPartStoragePtr();
if (new_projection_part_storage->exists())
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{
throw Exception(
ErrorCodes::DIRECTORY_ALREADY_EXISTS,
"Could not flush projection part {}. Projection part in {} already exists",
projection_name,
new_projection_part_storage->getFullPath());
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}
new_projection_part_storage->createDirectories();
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const auto & desc = projections.get(name);
auto projection_compression_codec = storage.getContext()->chooseCompressionCodec(0, 0);
auto projection_indices = MergeTreeIndexFactory::instance().getMany(desc.metadata->getSecondaryIndices());
MergedBlockOutputStream projection_out(
new_projection_part, desc.metadata,
new_projection_part->getColumns(), projection_indices,
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projection_compression_codec, NO_TRANSACTION_PTR);
projection_out.write(old_projection_part->block);
projection_out.finalizePart(new_projection_part, false);
new_data_part->addProjectionPart(projection_name, std::move(new_projection_part));
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}
}
out.finalizePart(new_data_part, false);
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new_data_part_storage->commitTransaction();
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return new_data_part_storage;
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}
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DataPartStoragePtr MergeTreeDataPartInMemory::makeCloneInDetached(const String & prefix, const StorageMetadataPtr & metadata_snapshot) const
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{
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String detached_path = *getRelativePathForDetachedPart(prefix, /* broken */ false);
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return flushToDisk(detached_path, metadata_snapshot);
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}
void MergeTreeDataPartInMemory::renameTo(const String & new_relative_path, bool /* remove_new_dir_if_exists */)
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{
getDataPartStorage().setRelativePath(new_relative_path);
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}
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void MergeTreeDataPartInMemory::calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const
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{
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auto it = checksums.files.find("data.bin");
if (it != checksums.files.end())
total_size.data_uncompressed += it->second.uncompressed_size;
for (const auto & column : columns)
each_columns_size[column.name].data_uncompressed += block.getByName(column.name).column->byteSize();
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}
IMergeTreeDataPart::Checksum MergeTreeDataPartInMemory::calculateBlockChecksum() const
{
SipHash hash;
IMergeTreeDataPart::Checksum checksum;
for (const auto & column : block)
column.column->updateHashFast(hash);
checksum.uncompressed_size = block.bytes();
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hash.get128(checksum.uncompressed_hash);
return checksum;
}
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DataPartInMemoryPtr asInMemoryPart(const MergeTreeDataPartPtr & part)
{
return std::dynamic_pointer_cast<const MergeTreeDataPartInMemory>(part);
}
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}