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https://github.com/ClickHouse/ClickHouse.git
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631 lines
21 KiB
C++
631 lines
21 KiB
C++
#pragma once
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#include <DB/Dictionaries/IDictionary.h>
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#include <DB/Dictionaries/IDictionarySource.h>
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#include <DB/Dictionaries/DictionaryStructure.h>
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#include <DB/Common/HashTable/HashMap.h>
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#include <DB/Columns/ColumnString.h>
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#include <DB/Common/HashTable/HashMap.h>
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#include <statdaemons/ext/scope_guard.hpp>
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#include <Poco/RWLock.h>
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#include <cmath>
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#include <atomic>
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#include <chrono>
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#include <vector>
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#include <map>
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#include <tuple>
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namespace DB
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{
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class CacheDictionary final : public IDictionary
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{
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public:
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CacheDictionary(const std::string & name, const DictionaryStructure & dict_struct,
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DictionarySourcePtr source_ptr, const DictionaryLifetime dict_lifetime,
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const std::size_t size)
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: name{name}, dict_struct(dict_struct),
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source_ptr{std::move(source_ptr)}, dict_lifetime(dict_lifetime),
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size{round_up_to_power_of_two(size)},
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cells{this->size}
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{
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if (!this->source_ptr->supportsSelectiveLoad())
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throw Exception{
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name + ": source cannot be used with CacheDictionary",
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ErrorCodes::UNSUPPORTED_METHOD
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};
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createAttributes();
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}
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CacheDictionary(const CacheDictionary & other)
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: CacheDictionary{other.name, other.dict_struct, other.source_ptr->clone(), other.dict_lifetime, other.size}
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{}
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std::exception_ptr getCreationException() const override { return {}; }
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std::string getName() const override { return name; }
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std::string getTypeName() const override { return "Cache"; }
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std::size_t getBytesAllocated() const override { return bytes_allocated; }
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std::size_t getQueryCount() const override { return query_count.load(std::memory_order_relaxed); }
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double getHitRate() const override
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{
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return static_cast<double>(hit_count.load(std::memory_order_acquire)) /
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query_count.load(std::memory_order_relaxed);
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}
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std::size_t getElementCount() const override { return element_count.load(std::memory_order_relaxed); }
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double getLoadFactor() const override
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{
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return static_cast<double>(element_count.load(std::memory_order_relaxed)) / size;
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}
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bool isCached() const override { return true; }
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DictionaryPtr clone() const override { return std::make_unique<CacheDictionary>(*this); }
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const IDictionarySource * getSource() const override { return source_ptr.get(); }
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const DictionaryLifetime & getLifetime() const override { return dict_lifetime; }
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const DictionaryStructure & getStructure() const override { return dict_struct; }
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std::chrono::time_point<std::chrono::system_clock> getCreationTime() const override
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{
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return creation_time;
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}
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bool isInjective(const std::string & attribute_name) const override
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{
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return dict_struct.attributes[&getAttribute(attribute_name) - attributes.data()].injective;
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}
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bool hasHierarchy() const override { return hierarchical_attribute; }
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void toParent(const PODArray<id_t> & ids, PODArray<id_t> & out) const override
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{
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getItems<UInt64>(*hierarchical_attribute, ids, out);
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}
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#define DECLARE_MULTIPLE_GETTER(TYPE)\
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void get##TYPE(const std::string & attribute_name, const PODArray<id_t> & ids, PODArray<TYPE> & out) const override\
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{\
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auto & attribute = getAttribute(attribute_name);\
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if (attribute.type != AttributeUnderlyingType::TYPE)\
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throw Exception{\
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name + ": type mismatch: attribute " + attribute_name + " has type " + toString(attribute.type),\
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ErrorCodes::TYPE_MISMATCH\
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};\
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\
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getItems<TYPE>(attribute, ids, out);\
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}
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DECLARE_MULTIPLE_GETTER(UInt8)
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DECLARE_MULTIPLE_GETTER(UInt16)
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DECLARE_MULTIPLE_GETTER(UInt32)
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DECLARE_MULTIPLE_GETTER(UInt64)
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DECLARE_MULTIPLE_GETTER(Int8)
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DECLARE_MULTIPLE_GETTER(Int16)
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DECLARE_MULTIPLE_GETTER(Int32)
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DECLARE_MULTIPLE_GETTER(Int64)
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DECLARE_MULTIPLE_GETTER(Float32)
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DECLARE_MULTIPLE_GETTER(Float64)
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#undef DECLARE_MULTIPLE_GETTER
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void getString(const std::string & attribute_name, const PODArray<id_t> & ids, ColumnString * out) const override
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{
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auto & attribute = getAttribute(attribute_name);
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if (attribute.type != AttributeUnderlyingType::String)
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throw Exception{
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name + ": type mismatch: attribute " + attribute_name + " has type " + toString(attribute.type),
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ErrorCodes::TYPE_MISMATCH
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};
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getItems(attribute, ids, out);
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}
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private:
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struct cell_metadata_t final
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{
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std::uint64_t id;
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std::chrono::system_clock::time_point expires_at;
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};
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struct attribute_t final
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{
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AttributeUnderlyingType type;
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std::tuple<UInt8, UInt16, UInt32, UInt64,
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Int8, Int16, Int32, Int64,
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Float32, Float64,
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String> null_values;
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std::tuple<std::unique_ptr<UInt8[]>,
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std::unique_ptr<UInt16[]>,
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std::unique_ptr<UInt32[]>,
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std::unique_ptr<UInt64[]>,
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std::unique_ptr<Int8[]>,
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std::unique_ptr<Int16[]>,
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std::unique_ptr<Int32[]>,
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std::unique_ptr<Int64[]>,
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std::unique_ptr<Float32[]>,
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std::unique_ptr<Float64[]>,
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std::unique_ptr<StringRef[]>> arrays;
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};
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void createAttributes()
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{
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const auto size = dict_struct.attributes.size();
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attributes.reserve(size);
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bytes_allocated += size * sizeof(cell_metadata_t);
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bytes_allocated += size * sizeof(attributes.front());
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for (const auto & attribute : dict_struct.attributes)
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{
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attribute_index_by_name.emplace(attribute.name, attributes.size());
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attributes.push_back(createAttributeWithType(attribute.underlying_type, attribute.null_value));
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if (attribute.hierarchical)
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{
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hierarchical_attribute = &attributes.back();
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if (hierarchical_attribute->type != AttributeUnderlyingType::UInt64)
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throw Exception{
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name + ": hierarchical attribute must be UInt64.",
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ErrorCodes::TYPE_MISMATCH
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};
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}
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}
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}
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attribute_t createAttributeWithType(const AttributeUnderlyingType type, const Field & null_value)
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{
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attribute_t attr{type};
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switch (type)
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{
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case AttributeUnderlyingType::UInt8:
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std::get<UInt8>(attr.null_values) = null_value.get<UInt64>();
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std::get<std::unique_ptr<UInt8[]>>(attr.arrays) = std::make_unique<UInt8[]>(size);
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bytes_allocated += size * sizeof(UInt8);
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break;
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case AttributeUnderlyingType::UInt16:
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std::get<UInt16>(attr.null_values) = null_value.get<UInt64>();
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std::get<std::unique_ptr<UInt16[]>>(attr.arrays) = std::make_unique<UInt16[]>(size);
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bytes_allocated += size * sizeof(UInt16);
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break;
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case AttributeUnderlyingType::UInt32:
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std::get<UInt32>(attr.null_values) = null_value.get<UInt64>();
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std::get<std::unique_ptr<UInt32[]>>(attr.arrays) = std::make_unique<UInt32[]>(size);
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bytes_allocated += size * sizeof(UInt32);
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break;
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case AttributeUnderlyingType::UInt64:
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std::get<UInt64>(attr.null_values) = null_value.get<UInt64>();
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std::get<std::unique_ptr<UInt64[]>>(attr.arrays) = std::make_unique<UInt64[]>(size);
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bytes_allocated += size * sizeof(UInt64);
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break;
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case AttributeUnderlyingType::Int8:
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std::get<Int8>(attr.null_values) = null_value.get<Int64>();
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std::get<std::unique_ptr<Int8[]>>(attr.arrays) = std::make_unique<Int8[]>(size);
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bytes_allocated += size * sizeof(Int8);
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break;
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case AttributeUnderlyingType::Int16:
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std::get<Int16>(attr.null_values) = null_value.get<Int64>();
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std::get<std::unique_ptr<Int16[]>>(attr.arrays) = std::make_unique<Int16[]>(size);
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bytes_allocated += size * sizeof(Int16);
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break;
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case AttributeUnderlyingType::Int32:
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std::get<Int32>(attr.null_values) = null_value.get<Int64>();
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std::get<std::unique_ptr<Int32[]>>(attr.arrays) = std::make_unique<Int32[]>(size);
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bytes_allocated += size * sizeof(Int32);
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break;
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case AttributeUnderlyingType::Int64:
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std::get<Int64>(attr.null_values) = null_value.get<Int64>();
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std::get<std::unique_ptr<Int64[]>>(attr.arrays) = std::make_unique<Int64[]>(size);
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bytes_allocated += size * sizeof(Int64);
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break;
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case AttributeUnderlyingType::Float32:
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std::get<Float32>(attr.null_values) = null_value.get<Float64>();
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std::get<std::unique_ptr<Float32[]>>(attr.arrays) = std::make_unique<Float32[]>(size);
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bytes_allocated += size * sizeof(Float32);
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break;
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case AttributeUnderlyingType::Float64:
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std::get<Float64>(attr.null_values) = null_value.get<Float64>();
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std::get<std::unique_ptr<Float64[]>>(attr.arrays) = std::make_unique<Float64[]>(size);
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bytes_allocated += size * sizeof(Float64);
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break;
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case AttributeUnderlyingType::String:
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std::get<String>(attr.null_values) = null_value.get<String>();
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std::get<std::unique_ptr<StringRef[]>>(attr.arrays) = std::make_unique<StringRef[]>(size);
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bytes_allocated += size * sizeof(StringRef);
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break;
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}
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return attr;
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}
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template <typename T>
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void getItems(attribute_t & attribute, const PODArray<id_t> & ids, PODArray<T> & out) const
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{
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HashMap<id_t, std::vector<std::size_t>> outdated_ids;
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auto & attribute_array = std::get<std::unique_ptr<T[]>>(attribute.arrays);
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{
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const Poco::ScopedReadRWLock read_lock{rw_lock};
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const auto now = std::chrono::system_clock::now();
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/// fetch up-to-date values, decide which ones require update
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for (const auto i : ext::range(0, ids.size()))
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{
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const auto id = ids[i];
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if (id == 0)
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{
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out[i] = std::get<T>(attribute.null_values);
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continue;
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}
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const auto cell_idx = getCellIdx(id);
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const auto & cell = cells[cell_idx];
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if (cell.id != id || cell.expires_at < now)
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{
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out[i] = std::get<T>(attribute.null_values);
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outdated_ids[id].push_back(i);
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}
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else
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out[i] = attribute_array[cell_idx];
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}
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}
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query_count.fetch_add(ids.size(), std::memory_order_relaxed);
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hit_count.fetch_add(ids.size() - outdated_ids.size(), std::memory_order_release);
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if (outdated_ids.empty())
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return;
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/// request new values
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std::vector<id_t> required_ids(outdated_ids.size());
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std::transform(std::begin(outdated_ids), std::end(outdated_ids), std::begin(required_ids),
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[] (auto & pair) { return pair.first; });
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update(required_ids, [&] (const auto id, const auto cell_idx) {
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const auto attribute_value = attribute_array[cell_idx];
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/// set missing values to out
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for (const auto out_idx : outdated_ids[id])
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out[out_idx] = attribute_value;
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});
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}
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void getItems(attribute_t & attribute, const PODArray<id_t> & ids, ColumnString * out) const
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{
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/// save on some allocations
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out->getOffsets().reserve(ids.size());
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auto & attribute_array = std::get<std::unique_ptr<StringRef[]>>(attribute.arrays);
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auto found_outdated_values = false;
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/// perform optimistic version, fallback to pessimistic if failed
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{
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const Poco::ScopedReadRWLock read_lock{rw_lock};
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const auto now = std::chrono::system_clock::now();
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/// fetch up-to-date values, discard on fail
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for (const auto i : ext::range(0, ids.size()))
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{
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const auto id = ids[i];
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const auto cell_idx = getCellIdx(id);
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const auto & cell = cells[cell_idx];
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if (cell.id != id || cell.expires_at < now)
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{
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found_outdated_values = true;
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break;
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}
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else
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{
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const auto string_ref = attribute_array[cell_idx];
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out->insertData(string_ref.data, string_ref.size);
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}
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}
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}
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/// optimistic code completed successfully
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if (!found_outdated_values)
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{
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query_count.fetch_add(ids.size(), std::memory_order_relaxed);
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hit_count.fetch_add(ids.size(), std::memory_order_release);
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return;
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}
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/// now onto the pessimistic one, discard possibly partial results from the optimistic path
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out->getChars().resize_assume_reserved(0);
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out->getOffsets().resize_assume_reserved(0);
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/// outdated ids joined number of times they've been requested
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HashMap<id_t, std::size_t> outdated_ids;
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/// we are going to store every string separately
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HashMap<id_t, String> map;
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std::size_t total_length = 0;
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{
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const Poco::ScopedReadRWLock read_lock{rw_lock};
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const auto now = std::chrono::system_clock::now();
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for (const auto i : ext::range(0, ids.size()))
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{
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const auto id = ids[i];
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const auto cell_idx = getCellIdx(id);
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const auto & cell = cells[cell_idx];
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if (cell.id != id || cell.expires_at < now)
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outdated_ids[id] += 1;
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else
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{
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const auto string_ref = attribute_array[cell_idx];
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map[id] = String{string_ref};
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total_length += string_ref.size + 1;
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}
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}
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}
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query_count.fetch_add(ids.size(), std::memory_order_relaxed);
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hit_count.fetch_add(ids.size() - outdated_ids.size(), std::memory_order_release);
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/// request new values
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if (!outdated_ids.empty())
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{
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std::vector<id_t> required_ids(outdated_ids.size());
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std::transform(std::begin(outdated_ids), std::end(outdated_ids), std::begin(required_ids),
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[] (auto & pair) { return pair.first; });
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update(required_ids, [&] (const auto id, const auto cell_idx) {
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const auto attribute_value = attribute_array[cell_idx];
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map[id] = String{attribute_value};
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total_length += (attribute_value.size + 1) * outdated_ids[id];
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});
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}
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out->getChars().reserve(total_length);
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for (const auto id : ids)
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{
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const auto it = map.find(id);
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const auto string = it != map.end() ? it->second : std::get<String>(attribute.null_values);
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out->insertData(string.data(), string.size());
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}
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}
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template <typename F>
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void update(const std::vector<id_t> ids, F && on_cell_updated) const
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{
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auto stream = source_ptr->loadIds(ids);
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stream->readPrefix();
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HashMap<UInt64, UInt8> remaining_ids{ids.size()};
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for (const auto id : ids)
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remaining_ids.insert({ id, 0 });
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std::uniform_int_distribution<std::uint64_t> distribution{
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dict_lifetime.min_sec,
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dict_lifetime.max_sec
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};
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const Poco::ScopedWriteRWLock write_lock{rw_lock};
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while (const auto block = stream->read())
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{
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const auto id_column = typeid_cast<const ColumnVector<UInt64> *>(block.getByPosition(0).column.get());
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if (!id_column)
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throw Exception{
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name + ": id column has type different from UInt64.",
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ErrorCodes::TYPE_MISMATCH
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};
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const auto & ids = id_column->getData();
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/// cache column pointers
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std::vector<const IColumn *> column_ptrs(attributes.size());
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for (const auto i : ext::range(0, attributes.size()))
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column_ptrs[i] = block.getByPosition(i + 1).column.get();
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for (const auto i : ext::range(0, ids.size()))
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{
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const auto id = ids[i];
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const auto cell_idx = getCellIdx(id);
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auto & cell = cells[cell_idx];
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for (const auto attribute_idx : ext::range(0, attributes.size()))
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{
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const auto & attribute_column = *column_ptrs[attribute_idx];
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auto & attribute = attributes[attribute_idx];
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setAttributeValue(attribute, cell_idx, attribute_column[i]);
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}
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/// if cell id is zero and zero does not map to this cell, then the cell is unused
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if (cell.id == 0 && cell_idx != zero_cell_idx)
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element_count.fetch_add(1, std::memory_order_relaxed);
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cell.id = id;
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if (dict_lifetime.min_sec != 0 && dict_lifetime.max_sec != 0)
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cell.expires_at = std::chrono::system_clock::now() + std::chrono::seconds{distribution(rnd_engine)};
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else
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cell.expires_at = std::chrono::time_point<std::chrono::system_clock>::max();
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on_cell_updated(id, cell_idx);
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remaining_ids[id] = 1;
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}
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}
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stream->readSuffix();
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for (const auto id_found_pair : remaining_ids)
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{
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if (id_found_pair.second)
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continue;
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const auto id = id_found_pair.first;
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const auto cell_idx = getCellIdx(id);
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auto & cell = cells[cell_idx];
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for (auto & attribute : attributes)
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setDefaultAttributeValue(attribute, cell_idx);
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if (cell.id == 0 && cell_idx != zero_cell_idx)
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element_count.fetch_add(1, std::memory_order_relaxed);
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cell.id = id;
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if (dict_lifetime.min_sec != 0 && dict_lifetime.max_sec != 0)
|
|
cell.expires_at = std::chrono::system_clock::now() + std::chrono::seconds{distribution(rnd_engine)};
|
|
else
|
|
cell.expires_at = std::chrono::time_point<std::chrono::system_clock>::max();
|
|
|
|
on_cell_updated(id, cell_idx);
|
|
}
|
|
}
|
|
|
|
std::uint64_t getCellIdx(const id_t id) const
|
|
{
|
|
const auto hash = intHash64(id);
|
|
const auto idx = hash & (size - 1);
|
|
return idx;
|
|
}
|
|
|
|
void setDefaultAttributeValue(attribute_t & attribute, const id_t idx) const
|
|
{
|
|
switch (attribute.type)
|
|
{
|
|
case AttributeUnderlyingType::UInt8: std::get<std::unique_ptr<UInt8[]>>(attribute.arrays)[idx] = std::get<UInt8>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::UInt16: std::get<std::unique_ptr<UInt16[]>>(attribute.arrays)[idx] = std::get<UInt16>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::UInt32: std::get<std::unique_ptr<UInt32[]>>(attribute.arrays)[idx] = std::get<UInt32>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::UInt64: std::get<std::unique_ptr<UInt64[]>>(attribute.arrays)[idx] = std::get<UInt64>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::Int8: std::get<std::unique_ptr<Int8[]>>(attribute.arrays)[idx] = std::get<Int8>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::Int16: std::get<std::unique_ptr<Int16[]>>(attribute.arrays)[idx] = std::get<Int16>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::Int32: std::get<std::unique_ptr<Int32[]>>(attribute.arrays)[idx] = std::get<Int32>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::Int64: std::get<std::unique_ptr<Int64[]>>(attribute.arrays)[idx] = std::get<Int64>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::Float32: std::get<std::unique_ptr<Float32[]>>(attribute.arrays)[idx] = std::get<Float32>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::Float64: std::get<std::unique_ptr<Float64[]>>(attribute.arrays)[idx] = std::get<Float64>(attribute.null_values); break;
|
|
case AttributeUnderlyingType::String:
|
|
{
|
|
const auto & null_value_ref = std::get<String>(attribute.null_values);
|
|
auto & string_ref = std::get<std::unique_ptr<StringRef[]>>(attribute.arrays)[idx];
|
|
if (string_ref.data == null_value_ref.data())
|
|
return;
|
|
|
|
if (string_ref.size != 0)
|
|
bytes_allocated -= string_ref.size + 1;
|
|
const std::unique_ptr<const char[]> deleter{string_ref.data};
|
|
|
|
string_ref = StringRef{null_value_ref};
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void setAttributeValue(attribute_t & attribute, const id_t idx, const Field & value) const
|
|
{
|
|
switch (attribute.type)
|
|
{
|
|
case AttributeUnderlyingType::UInt8: std::get<std::unique_ptr<UInt8[]>>(attribute.arrays)[idx] = value.get<UInt64>(); break;
|
|
case AttributeUnderlyingType::UInt16: std::get<std::unique_ptr<UInt16[]>>(attribute.arrays)[idx] = value.get<UInt64>(); break;
|
|
case AttributeUnderlyingType::UInt32: std::get<std::unique_ptr<UInt32[]>>(attribute.arrays)[idx] = value.get<UInt64>(); break;
|
|
case AttributeUnderlyingType::UInt64: std::get<std::unique_ptr<UInt64[]>>(attribute.arrays)[idx] = value.get<UInt64>(); break;
|
|
case AttributeUnderlyingType::Int8: std::get<std::unique_ptr<Int8[]>>(attribute.arrays)[idx] = value.get<Int64>(); break;
|
|
case AttributeUnderlyingType::Int16: std::get<std::unique_ptr<Int16[]>>(attribute.arrays)[idx] = value.get<Int64>(); break;
|
|
case AttributeUnderlyingType::Int32: std::get<std::unique_ptr<Int32[]>>(attribute.arrays)[idx] = value.get<Int64>(); break;
|
|
case AttributeUnderlyingType::Int64: std::get<std::unique_ptr<Int64[]>>(attribute.arrays)[idx] = value.get<Int64>(); break;
|
|
case AttributeUnderlyingType::Float32: std::get<std::unique_ptr<Float32[]>>(attribute.arrays)[idx] = value.get<Float64>(); break;
|
|
case AttributeUnderlyingType::Float64: std::get<std::unique_ptr<Float64[]>>(attribute.arrays)[idx] = value.get<Float64>(); break;
|
|
case AttributeUnderlyingType::String:
|
|
{
|
|
const auto & string = value.get<String>();
|
|
auto & string_ref = std::get<std::unique_ptr<StringRef[]>>(attribute.arrays)[idx];
|
|
const auto & null_value_ref = std::get<String>(attribute.null_values);
|
|
if (string_ref.data != null_value_ref.data())
|
|
{
|
|
if (string_ref.size != 0)
|
|
bytes_allocated -= string_ref.size + 1;
|
|
/// avoid explicit delete, let unique_ptr handle it
|
|
const std::unique_ptr<const char[]> deleter{string_ref.data};
|
|
}
|
|
|
|
const auto size = string.size();
|
|
if (size != 0)
|
|
{
|
|
auto string_ptr = std::make_unique<char[]>(size + 1);
|
|
std::copy(string.data(), string.data() + size + 1, string_ptr.get());
|
|
string_ref = StringRef{string_ptr.release(), size};
|
|
bytes_allocated += size + 1;
|
|
}
|
|
else
|
|
string_ref = {};
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
attribute_t & getAttribute(const std::string & attribute_name) const
|
|
{
|
|
const auto it = attribute_index_by_name.find(attribute_name);
|
|
if (it == std::end(attribute_index_by_name))
|
|
throw Exception{
|
|
name + ": no such attribute '" + attribute_name + "'",
|
|
ErrorCodes::BAD_ARGUMENTS
|
|
};
|
|
|
|
return attributes[it->second];
|
|
}
|
|
|
|
static std::size_t round_up_to_power_of_two(std::size_t n)
|
|
{
|
|
--n;
|
|
n |= n >> 1;
|
|
n |= n >> 2;
|
|
n |= n >> 4;
|
|
n |= n >> 8;
|
|
n |= n >> 16;
|
|
n |= n >> 32;
|
|
++n;
|
|
|
|
return n;
|
|
}
|
|
|
|
static std::uint64_t getSeed()
|
|
{
|
|
timespec ts;
|
|
clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
return ts.tv_nsec ^ getpid();
|
|
}
|
|
|
|
const std::string name;
|
|
const DictionaryStructure dict_struct;
|
|
const DictionarySourcePtr source_ptr;
|
|
const DictionaryLifetime dict_lifetime;
|
|
|
|
mutable Poco::RWLock rw_lock;
|
|
const std::size_t size;
|
|
const std::uint64_t zero_cell_idx{getCellIdx(0)};
|
|
std::map<std::string, std::size_t> attribute_index_by_name;
|
|
mutable std::vector<attribute_t> attributes;
|
|
mutable std::vector<cell_metadata_t> cells;
|
|
attribute_t * hierarchical_attribute = nullptr;
|
|
|
|
mutable std::mt19937_64 rnd_engine{getSeed()};
|
|
|
|
mutable std::size_t bytes_allocated = 0;
|
|
mutable std::atomic<std::size_t> element_count{0};
|
|
mutable std::atomic<std::size_t> hit_count{0};
|
|
mutable std::atomic<std::size_t> query_count{0};
|
|
|
|
const std::chrono::time_point<std::chrono::system_clock> creation_time = std::chrono::system_clock::now();
|
|
};
|
|
|
|
}
|