ClickHouse/dbms/src/Dictionaries/SSDCacheDictionary.cpp

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#include "SSDCacheDictionary.h"
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#include <algorithm>
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#include <Columns/ColumnsNumber.h>
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#include <Common/typeid_cast.h>
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#include <Common/ProfileEvents.h>
#include <Common/ProfilingScopedRWLock.h>
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#include <DataStreams/IBlockInputStream.h>
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#include "DictionaryFactory.h"
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#include <IO/WriteHelpers.h>
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#include <ext/chrono_io.h>
#include <ext/map.h>
#include <ext/range.h>
#include <ext/size.h>
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namespace ProfileEvents
{
extern const Event DictCacheKeysRequested;
extern const Event DictCacheKeysRequestedMiss;
extern const Event DictCacheKeysRequestedFound;
extern const Event DictCacheKeysExpired;
extern const Event DictCacheKeysNotFound;
extern const Event DictCacheKeysHit;
extern const Event DictCacheRequestTimeNs;
extern const Event DictCacheRequests;
extern const Event DictCacheLockWriteNs;
extern const Event DictCacheLockReadNs;
}
namespace CurrentMetrics
{
extern const Metric DictCacheRequests;
}
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namespace DB
{
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namespace ErrorCodes
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{
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extern const int TYPE_MISMATCH;
extern const int BAD_ARGUMENTS;
extern const int UNSUPPORTED_METHOD;
extern const int LOGICAL_ERROR;
extern const int TOO_SMALL_BUFFER_SIZE;
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}
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namespace
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{
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constexpr size_t INMEMORY = (1ULL << 63ULL);
const std::string BIN_FILE_EXT = ".bin";
const std::string IND_FILE_EXT = ".idx";
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}
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CachePartition::CachePartition(
const AttributeUnderlyingType & /* key_structure */, const std::vector<AttributeUnderlyingType> & attributes_structure,
const std::string & dir_path, const size_t file_id_, const size_t max_size_, const size_t buffer_size_)
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: file_id(file_id_), max_size(max_size_), buffer_size(buffer_size_), path(dir_path + "/" + std::to_string(file_id))
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{
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keys_buffer.type = AttributeUnderlyingType::utUInt64;
keys_buffer.values = std::vector<UInt64>();
for (const auto & type : attributes_structure)
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{
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switch (type)
{
#define DISPATCH(TYPE) \
case AttributeUnderlyingType::ut##TYPE: \
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attributes_buffer.emplace_back(); \
attributes_buffer.back().type = type; \
attributes_buffer.back().values = std::vector<TYPE>(); \
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break;
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DISPATCH(UInt8)
DISPATCH(UInt16)
DISPATCH(UInt32)
DISPATCH(UInt64)
DISPATCH(UInt128)
DISPATCH(Int8)
DISPATCH(Int16)
DISPATCH(Int32)
DISPATCH(Int64)
DISPATCH(Decimal32)
DISPATCH(Decimal64)
DISPATCH(Decimal128)
DISPATCH(Float32)
DISPATCH(Float64)
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#undef DISPATCH
case AttributeUnderlyingType::utString:
// TODO: string support
break;
}
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}
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}
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void CachePartition::appendBlock(const Attribute & new_keys, const Attributes & new_attributes)
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{
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if (new_attributes.size() != attributes_buffer.size())
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throw Exception{"Wrong columns number in block.", ErrorCodes::BAD_ARGUMENTS};
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const auto & ids = std::get<Attribute::Container<UInt64>>(new_keys.values);
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size_t start_size = ids.size();
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appendValuesToBufferAttribute(keys_buffer, new_keys);
for (size_t i = 0; i < attributes_buffer.size(); ++i)
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{
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appendValuesToBufferAttribute(attributes_buffer[i], new_attributes[i]);
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//bytes += buffer[i]->byteSize();
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}
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for (size_t i = 0; i < ids.size(); ++i)
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{
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key_to_file_offset[ids[i]] = (start_size + i) | INMEMORY;
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}
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//if (bytes >= buffer_size)
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{
flush();
}
}
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void CachePartition::appendValuesToBufferAttribute(Attribute & to, const Attribute & from)
{
switch (to.type)
{
#define DISPATCH(TYPE) \
case AttributeUnderlyingType::ut##TYPE: \
{ \
auto &to_values = std::get<Attribute::Container<TYPE>>(to.values); \
auto &from_values = std::get<Attribute::Container<TYPE>>(from.values); \
size_t prev_size = to_values.size(); \
to_values.resize(to_values.size() + from_values.size()); \
memcpy(to_values.data() + prev_size * sizeof(TYPE), from_values.data(), from_values.size() * sizeof(TYPE)); \
} \
break;
DISPATCH(UInt8)
DISPATCH(UInt16)
DISPATCH(UInt32)
DISPATCH(UInt64)
DISPATCH(UInt128)
DISPATCH(Int8)
DISPATCH(Int16)
DISPATCH(Int32)
DISPATCH(Int64)
DISPATCH(Decimal32)
DISPATCH(Decimal64)
DISPATCH(Decimal128)
DISPATCH(Float32)
DISPATCH(Float64)
#undef DISPATCH
case AttributeUnderlyingType::utString:
// TODO: string support
break;
}
}
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void CachePartition::flush()
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{
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if (!write_data_buffer)
{
write_data_buffer = std::make_unique<WriteBufferAIO>(path + BIN_FILE_EXT, buffer_size, O_RDWR | O_CREAT | O_TRUNC);
// TODO: не перетирать + seek в конец файла
}
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const auto & ids = std::get<Attribute::Container<UInt64>>(keys_buffer.values);
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std::vector<size_t> offsets;
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size_t prev_size = 0;
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for (size_t row = 0; row < ids.size(); ++row)
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{
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offsets.push_back((offsets.empty() ? write_data_buffer->getPositionInFile() : offsets.back()) + prev_size);
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prev_size = 0;
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for (size_t col = 0; col < attributes_buffer.size(); ++col)
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{
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const auto & attribute = attributes_buffer[col];
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switch (attribute.type)
{
#define DISPATCH(TYPE) \
case AttributeUnderlyingType::ut##TYPE: \
{ \
const auto & values = std::get<Attribute::Container<TYPE>>(attribute.values); \
writeBinary(values[row], *static_cast<WriteBuffer*>(write_data_buffer.get())); \
} \
break;
DISPATCH(UInt8)
DISPATCH(UInt16)
DISPATCH(UInt32)
DISPATCH(UInt64)
DISPATCH(UInt128)
DISPATCH(Int8)
DISPATCH(Int16)
DISPATCH(Int32)
DISPATCH(Int64)
DISPATCH(Decimal32)
DISPATCH(Decimal64)
DISPATCH(Decimal128)
DISPATCH(Float32)
DISPATCH(Float64)
#undef DISPATCH
case AttributeUnderlyingType::utString:
// TODO: string support
break;
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}
}
}
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write_data_buffer->sync();
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/// commit changes in index
for (size_t row = 0; row < ids.size(); ++row)
key_to_file_offset[ids[row]] = offsets[row];
/// clear buffer
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std::visit([](auto & attr) { attr.clear(); }, keys_buffer.values);
for (auto & attribute : attributes_buffer)
std::visit([](auto & attr) { attr.clear(); }, attribute.values);
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}
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template <typename Out, typename Key>
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void CachePartition::getValue(size_t attribute_index, const PaddedPODArray<UInt64> & ids,
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ResultArrayType<Out> & out, std::unordered_map<Key, std::vector<size_t>> & not_found) const
{
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UNUSED(attribute_index);
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UNUSED(ids);
UNUSED(out);
UNUSED(not_found);
}
void CachePartition::has(const PaddedPODArray<UInt64> & ids, ResultArrayType<UInt8> & out) const
{
UNUSED(ids);
UNUSED(out);
}
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CacheStorage::CacheStorage(SSDCacheDictionary & dictionary_, const std::string & path_, const size_t partitions_count_, const size_t partition_max_size_)
: dictionary(dictionary_)
, path(path_)
, partition_max_size(partition_max_size_)
, log(&Poco::Logger::get("CacheStorage"))
{
std::vector<AttributeUnderlyingType> structure;
for (const auto & item : dictionary.getStructure().attributes)
{
structure.push_back(item.underlying_type);
}
for (size_t partition_id = 0; partition_id < partitions_count_; ++partition_id)
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partitions.emplace_back(std::make_unique<CachePartition>(AttributeUnderlyingType::utUInt64, structure, path_, partition_id, partition_max_size));
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}
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template <typename PresentIdHandler, typename AbsentIdHandler>
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void CacheStorage::update(DictionarySourcePtr & source_ptr, const std::vector<Key> & requested_ids,
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PresentIdHandler && on_updated, AbsentIdHandler && on_id_not_found)
{
CurrentMetrics::Increment metric_increment{CurrentMetrics::DictCacheRequests};
ProfileEvents::increment(ProfileEvents::DictCacheKeysRequested, requested_ids.size());
std::unordered_map<Key, UInt8> remaining_ids{requested_ids.size()};
for (const auto id : requested_ids)
remaining_ids.insert({id, 0});
const auto now = std::chrono::system_clock::now();
const ProfilingScopedWriteRWLock write_lock{rw_lock, ProfileEvents::DictCacheLockWriteNs};
if (now > backoff_end_time)
{
try
{
if (update_error_count)
{
/// Recover after error: we have to clone the source here because
/// it could keep connections which should be reset after error.
source_ptr = source_ptr->clone();
}
Stopwatch watch;
auto stream = source_ptr->loadIds(requested_ids);
stream->readPrefix();
while (const auto block = stream->read())
{
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const auto new_keys = createAttributesFromBlock(block, 0, 1).front();
const auto new_attributes = createAttributesFromBlock(block, 1);
const auto & ids = std::get<CachePartition::Attribute::Container<UInt64>>(new_keys.values);
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for (const auto i : ext::range(0, ids.size()))
{
/// mark corresponding id as found
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on_updated(ids[i], i, new_attributes);
remaining_ids[ids[i]] = 1;
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}
/// TODO: Add TTL to block
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partitions[0]->appendBlock(new_keys, new_attributes);
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}
stream->readSuffix();
update_error_count = 0;
last_update_exception = std::exception_ptr{};
backoff_end_time = std::chrono::system_clock::time_point{};
ProfileEvents::increment(ProfileEvents::DictCacheRequestTimeNs, watch.elapsed());
}
catch (...)
{
++update_error_count;
last_update_exception = std::current_exception();
backoff_end_time = now + std::chrono::seconds(calculateDurationWithBackoff(rnd_engine, update_error_count));
tryLogException(last_update_exception, log, "Could not update cache dictionary '" + dictionary.getName() +
"', next update is scheduled at " + ext::to_string(backoff_end_time));
}
}
size_t not_found_num = 0, found_num = 0;
/// Check which ids have not been found and require setting null_value
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CachePartition::Attribute new_keys;
new_keys.type = AttributeUnderlyingType::utUInt64;
new_keys.values = std::vector<UInt64>();
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CachePartition::Attributes new_attributes;
{
/// TODO: create attributes from structure
for (const auto & attribute : dictionary.getAttributes())
{
switch (attribute.type)
{
#define DISPATCH(TYPE) \
case AttributeUnderlyingType::ut##TYPE: \
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new_attributes.emplace_back(); \
new_attributes.back().type = attribute.type; \
new_attributes.back().values = std::vector<TYPE>(); \
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break;
DISPATCH(UInt8)
DISPATCH(UInt16)
DISPATCH(UInt32)
DISPATCH(UInt64)
DISPATCH(UInt128)
DISPATCH(Int8)
DISPATCH(Int16)
DISPATCH(Int32)
DISPATCH(Int64)
DISPATCH(Decimal32)
DISPATCH(Decimal64)
DISPATCH(Decimal128)
DISPATCH(Float32)
DISPATCH(Float64)
#undef DISPATCH
case AttributeUnderlyingType::utString:
// TODO: string support
break;
}
}
}
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for (const auto & id_found_pair : remaining_ids)
{
if (id_found_pair.second)
{
++found_num;
continue;
}
++not_found_num;
const auto id = id_found_pair.first;
if (update_error_count)
{
/// TODO: юзать старые значения.
/// We don't have expired data for that `id` so all we can do is to rethrow `last_exception`.
std::rethrow_exception(last_update_exception);
}
/// TODO: Add TTL
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// Set key
std::get<std::vector<UInt64>>(new_keys.values).push_back(id);
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/// Set null_value for each attribute
const auto & attributes = dictionary.getAttributes();
for (size_t i = 0; i < attributes.size(); ++i)
{
const auto & attribute = attributes[i];
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// append null
switch (attribute.type)
{
#define DISPATCH(TYPE) \
case AttributeUnderlyingType::ut##TYPE: \
{ \
auto & to_values = std::get<std::vector<TYPE>>(new_attributes[i].values); \
auto & null_value = std::get<TYPE>(attribute.null_value); \
to_values.push_back(null_value); \
} \
break;
DISPATCH(UInt8)
DISPATCH(UInt16)
DISPATCH(UInt32)
DISPATCH(UInt64)
DISPATCH(UInt128)
DISPATCH(Int8)
DISPATCH(Int16)
DISPATCH(Int32)
DISPATCH(Int64)
DISPATCH(Decimal32)
DISPATCH(Decimal64)
DISPATCH(Decimal128)
DISPATCH(Float32)
DISPATCH(Float64)
#undef DISPATCH
case AttributeUnderlyingType::utString:
// TODO: string support
break;
}
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}
/// inform caller that the cell has not been found
on_id_not_found(id);
}
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partitions[0]->appendBlock(new_keys, new_attributes);
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ProfileEvents::increment(ProfileEvents::DictCacheKeysRequestedMiss, not_found_num);
ProfileEvents::increment(ProfileEvents::DictCacheKeysRequestedFound, found_num);
ProfileEvents::increment(ProfileEvents::DictCacheRequests);
}
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CachePartition::Attributes CacheStorage::createAttributesFromBlock(const Block & block, const size_t begin, size_t end)
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{
CachePartition::Attributes attributes;
const auto & structure = dictionary.getAttributes();
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if (end == static_cast<decltype(end)>(-1))
end = structure.size();
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const auto columns = block.getColumns();
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for (size_t i = begin; i < end; ++i)
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{
const auto & column = columns[i];
switch (structure[i].type)
{
#define DISPATCH(TYPE) \
case AttributeUnderlyingType::ut##TYPE: \
{ \
std::vector<TYPE> values(column->size()); \
const auto raw_data = column->getRawData(); \
memcpy(values.data(), raw_data.data, raw_data.size); \
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attributes.emplace_back(); \
attributes.back().type = structure[i].type; \
attributes.back().values = std::move(values); \
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} \
break;
DISPATCH(UInt8)
DISPATCH(UInt16)
DISPATCH(UInt32)
DISPATCH(UInt64)
DISPATCH(UInt128)
DISPATCH(Int8)
DISPATCH(Int16)
DISPATCH(Int32)
DISPATCH(Int64)
DISPATCH(Decimal32)
DISPATCH(Decimal64)
DISPATCH(Decimal128)
DISPATCH(Float32)
DISPATCH(Float64)
#undef DISPATCH
case AttributeUnderlyingType::utString:
// TODO: string support
break;
}
}
return attributes;
}
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SSDCacheDictionary::SSDCacheDictionary(
const std::string & name_,
const DictionaryStructure & dict_struct_,
DictionarySourcePtr source_ptr_,
const DictionaryLifetime dict_lifetime_,
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const std::string & path_,
const size_t partition_max_size_)
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: name(name_)
, dict_struct(dict_struct_)
, source_ptr(std::move(source_ptr_))
, dict_lifetime(dict_lifetime_)
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, path(path_)
, partition_max_size(partition_max_size_)
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, storage(*this, path, 1, partition_max_size)
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, log(&Poco::Logger::get("SSDCacheDictionary"))
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{
if (!this->source_ptr->supportsSelectiveLoad())
throw Exception{name + ": source cannot be used with CacheDictionary", ErrorCodes::UNSUPPORTED_METHOD};
createAttributes();
}
#define DECLARE(TYPE) \
void SSDCacheDictionary::get##TYPE( \
const std::string & attribute_name, const PaddedPODArray<Key> & ids, ResultArrayType<TYPE> & out) const \
{ \
const auto index = getAttributeIndex(attribute_name); \
checkAttributeType(name, attribute_name, dict_struct.attributes[index].underlying_type, AttributeUnderlyingType::ut##TYPE); \
const auto null_value = std::get<TYPE>(attributes[index].null_value); \
getItemsNumberImpl<TYPE, TYPE>( \
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index, \
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ids, \
out, \
[&](const size_t) { return null_value; }); \
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}
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DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(UInt128)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
DECLARE(Decimal32)
DECLARE(Decimal64)
DECLARE(Decimal128)
#undef DECLARE
#define DECLARE(TYPE) \
void SSDCacheDictionary::get##TYPE( \
const std::string & attribute_name, \
const PaddedPODArray<Key> & ids, \
const PaddedPODArray<TYPE> & def, \
ResultArrayType<TYPE> & out) const \
{ \
const auto index = getAttributeIndex(attribute_name); \
checkAttributeType(name, attribute_name, dict_struct.attributes[index].underlying_type, AttributeUnderlyingType::ut##TYPE); \
getItemsNumberImpl<TYPE, TYPE>( \
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index, \
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ids, \
out, \
[&](const size_t row) { return def[row]; }); \
}
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(UInt128)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
DECLARE(Decimal32)
DECLARE(Decimal64)
DECLARE(Decimal128)
#undef DECLARE
#define DECLARE(TYPE) \
void SSDCacheDictionary::get##TYPE( \
const std::string & attribute_name, \
const PaddedPODArray<Key> & ids, \
const TYPE def, \
ResultArrayType<TYPE> & out) const \
{ \
const auto index = getAttributeIndex(attribute_name); \
checkAttributeType(name, attribute_name, dict_struct.attributes[index].underlying_type, AttributeUnderlyingType::ut##TYPE); \
getItemsNumberImpl<TYPE, TYPE>( \
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index, \
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ids, \
out, \
[&](const size_t) { return def; }); \
}
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(UInt128)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
DECLARE(Decimal32)
DECLARE(Decimal64)
DECLARE(Decimal128)
#undef DECLARE
template <typename AttributeType, typename OutputType, typename DefaultGetter>
void SSDCacheDictionary::getItemsNumberImpl(
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const size_t attribute_index, const PaddedPODArray<Key> & ids, ResultArrayType<OutputType> & out, DefaultGetter && get_default) const
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{
std::unordered_map<Key, std::vector<size_t>> not_found_ids;
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storage.getValue<OutputType>(attribute_index, ids, out, not_found_ids);
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if (not_found_ids.empty())
return;
std::vector<Key> required_ids(not_found_ids.size());
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std::transform(std::begin(not_found_ids), std::end(not_found_ids), std::begin(required_ids), [](const auto & pair) { return pair.first; });
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storage.update(
source_ptr,
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required_ids,
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[&](const auto id, const auto row, const auto & new_attributes) {
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for (const size_t out_row : not_found_ids[id])
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out[out_row] = std::get<std::vector<OutputType>>(new_attributes[attribute_index].values)[row];
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},
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[&](const size_t id)
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{
for (const size_t row : not_found_ids[id])
out[row] = get_default(row);
});
}
void SSDCacheDictionary::getString(const std::string & attribute_name, const PaddedPODArray<Key> & ids, ColumnString * out) const
{
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const auto index = getAttributeIndex(attribute_name);
checkAttributeType(name, attribute_name, attributes[index].type, AttributeUnderlyingType::utString);
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const auto null_value = StringRef{std::get<String>(attributes[index].null_value)};
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getItemsString(index, ids, out, [&](const size_t) { return null_value; });
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}
void SSDCacheDictionary::getString(
const std::string & attribute_name, const PaddedPODArray<Key> & ids, const ColumnString * const def, ColumnString * const out) const
{
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const auto index = getAttributeIndex(attribute_name);
checkAttributeType(name, attribute_name, attributes[index].type, AttributeUnderlyingType::utString);
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getItemsString(index, ids, out, [&](const size_t row) { return def->getDataAt(row); });
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}
void SSDCacheDictionary::getString(
const std::string & attribute_name, const PaddedPODArray<Key> & ids, const String & def, ColumnString * const out) const
{
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const auto index = getAttributeIndex(attribute_name);
checkAttributeType(name, attribute_name, attributes[index].type, AttributeUnderlyingType::utString);
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getItemsString(index, ids, out, [&](const size_t) { return StringRef{def}; });
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}
template <typename DefaultGetter>
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void SSDCacheDictionary::getItemsString(const size_t attribute_index, const PaddedPODArray<Key> & ids,
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ColumnString * out, DefaultGetter && get_default) const
{
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UNUSED(attribute_index);
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UNUSED(ids);
UNUSED(out);
UNUSED(get_default);
}
size_t SSDCacheDictionary::getAttributeIndex(const std::string & attr_name) const
{
auto it = attribute_index_by_name.find(attr_name);
if (it == std::end(attribute_index_by_name))
throw Exception{"Attribute `" + name + "` does not exist.", ErrorCodes::BAD_ARGUMENTS};
return it->second;
}
SSDCacheDictionary::Attribute & SSDCacheDictionary::getAttribute(const std::string & attr_name)
{
return attributes[getAttributeIndex(attr_name)];
}
const SSDCacheDictionary::Attribute & SSDCacheDictionary::getAttribute(const std::string & attr_name) const
{
return attributes[getAttributeIndex(attr_name)];
}
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const SSDCacheDictionary::Attributes & SSDCacheDictionary::getAttributes() const
{
return attributes;
}
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template <typename T>
SSDCacheDictionary::Attribute SSDCacheDictionary::createAttributeWithTypeImpl(const AttributeUnderlyingType type, const Field & null_value)
{
Attribute attr{type, {}};
attr.null_value = static_cast<T>(null_value.get<NearestFieldType<T>>());
bytes_allocated += sizeof(T);
return attr;
}
template <>
SSDCacheDictionary::Attribute SSDCacheDictionary::createAttributeWithTypeImpl<String>(const AttributeUnderlyingType type, const Field & null_value)
{
Attribute attr{type, {}};
attr.null_value = null_value.get<String>();
bytes_allocated += sizeof(StringRef);
//if (!string_arena)
// string_arena = std::make_unique<ArenaWithFreeLists>();
return attr;
}
SSDCacheDictionary::Attribute SSDCacheDictionary::createAttributeWithType(const AttributeUnderlyingType type, const Field & null_value)
{
switch (type)
{
#define DISPATCH(TYPE) \
case AttributeUnderlyingType::ut##TYPE: \
return createAttributeWithTypeImpl<TYPE>(type, null_value);
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DISPATCH(UInt8)
DISPATCH(UInt16)
DISPATCH(UInt32)
DISPATCH(UInt64)
DISPATCH(UInt128)
DISPATCH(Int8)
DISPATCH(Int16)
DISPATCH(Int32)
DISPATCH(Int64)
DISPATCH(Decimal32)
DISPATCH(Decimal64)
DISPATCH(Decimal128)
DISPATCH(Float32)
DISPATCH(Float64)
DISPATCH(String)
#undef DISPATCH
}
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throw Exception{"Unknown attribute type: " + std::to_string(static_cast<int>(type)), ErrorCodes::TYPE_MISMATCH};
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}
void SSDCacheDictionary::createAttributes()
{
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attributes.reserve(dict_struct.attributes.size());
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for (size_t i = 0; i < dict_struct.attributes.size(); ++i)
{
const auto & attribute = dict_struct.attributes[i];
attribute_index_by_name.emplace(attribute.name, i);
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attributes.push_back(createAttributeWithType(attribute.underlying_type, attribute.null_value));
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if (attribute.hierarchical)
throw Exception{name + ": hierarchical attributes not supported for dictionary of type " + getTypeName(),
ErrorCodes::TYPE_MISMATCH};
}
}
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void registerDictionarySSDCache(DictionaryFactory & factory)
{
auto create_layout = [=](const std::string & name,
const DictionaryStructure & dict_struct,
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix,
DictionarySourcePtr source_ptr) -> DictionaryPtr
{
if (dict_struct.key)
throw Exception{"'key' is not supported for dictionary of layout 'cache'", ErrorCodes::UNSUPPORTED_METHOD};
if (dict_struct.range_min || dict_struct.range_max)
throw Exception{name
+ ": elements .structure.range_min and .structure.range_max should be defined only "
"for a dictionary of layout 'range_hashed'",
ErrorCodes::BAD_ARGUMENTS};
const auto & layout_prefix = config_prefix + ".layout";
const auto max_partition_size = config.getInt(layout_prefix + ".ssd.max_partition_size");
if (max_partition_size == 0)
throw Exception{name + ": dictionary of layout 'cache' cannot have 0 cells", ErrorCodes::TOO_SMALL_BUFFER_SIZE};
const auto path = config.getString(layout_prefix + ".ssd.path");
if (path.empty())
throw Exception{name + ": dictionary of layout 'cache' cannot have empty path",
ErrorCodes::BAD_ARGUMENTS};
const DictionaryLifetime dict_lifetime{config, config_prefix + ".lifetime"};
return std::make_unique<SSDCacheDictionary>(name, dict_struct, std::move(source_ptr), dict_lifetime, path, max_partition_size);
};
factory.registerLayout("ssd", create_layout, false);
}
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}