ydb/yt/cpp/mapreduce/interface/operation-inl.h

#pragma once

#ifndef OPERATION_INL_H_
#error "Direct inclusion of this file is not allowed, use operation.h"
#include "operation.h"
#endif
#undef OPERATION_INL_H_

#include "errors.h"

#include <util/generic/bt_exception.h>
#include <util/generic/singleton.h>
#include <util/system/type_name.h>

#include <util/stream/file.h>
#include <util/stream/buffer.h>
#include <util/string/subst.h>

#include <typeindex>

namespace NYT {

namespace NDetail {

////////////////////////////////////////////////////////////////////////////////

template<class T>
void Assign(TVector<T>& array, size_t idx, const T& value) {
    array.resize(std::max(array.size(), idx + 1));
    array[idx] = value;
}

////////////////////////////////////////////////////////////////////////////////

template <typename TRow>
TStructuredRowStreamDescription GetStructuredRowStreamDescription()
{
    if constexpr (std::is_same_v<TRow, NYT::TNode>) {
        return TTNodeStructuredRowStream{};
    } else if constexpr (std::is_same_v<TRow, NYT::TYaMRRow>) {
        return TTYaMRRowStructuredRowStream{};
    } else if constexpr (std::is_same_v<::google::protobuf::Message, TRow>) {
        return TProtobufStructuredRowStream{nullptr};
    } else if constexpr (TIsBaseOf<::google::protobuf::Message, TRow>::Value) {
        return TProtobufStructuredRowStream{TRow::descriptor()};
    } else if constexpr (TIsProtoOneOf<TRow>::value) {
        return TProtobufStructuredRowStream{nullptr};
    } else {
        static_assert(TDependentFalse<TRow>, "Unknown row type");
    }
}

////////////////////////////////////////////////////////////////////////////////

} // namespace NDetail

////////////////////////////////////////////////////////////////////////////////

template <typename TRow>
TStructuredTablePath Structured(TRichYPath richYPath)
{
    return TStructuredTablePath(std::move(richYPath), StructuredTableDescription<TRow>());
}

template <typename TRow>
TTableStructure StructuredTableDescription()
{
    if constexpr (std::is_same_v<TRow, NYT::TNode>) {
        return TUnspecifiedTableStructure{};
    } else if constexpr (std::is_same_v<TRow, NYT::TYaMRRow>) {
        return TUnspecifiedTableStructure{};
    } else if constexpr (std::is_base_of_v<::google::protobuf::Message, TRow>) {
        if constexpr (std::is_same_v<::google::protobuf::Message, TRow>) {
            static_assert(TDependentFalse<TRow>, "Cannot use ::google::protobuf::Message as table descriptor");
        } else {
            return TProtobufTableStructure{TRow::descriptor()};
        }
    } else {
        static_assert(TDependentFalse<TRow>, "Unknown row type");
    }
}

////////////////////////////////////////////////////////////////////////////////

template <typename TDerived>
TDerived& TRawOperationIoTableSpec<TDerived>::AddInput(const TRichYPath& path)
{
    Inputs_.push_back(path);
    return static_cast<TDerived&>(*this);
}

template <typename TDerived>
TDerived& TRawOperationIoTableSpec<TDerived>::SetInput(size_t tableIndex, const TRichYPath& path)
{
    NDetail::Assign(Inputs_, tableIndex, path);
}

template <typename TDerived>
TDerived& TRawOperationIoTableSpec<TDerived>::AddOutput(const TRichYPath& path)
{
    Outputs_.push_back(path);
    return static_cast<TDerived&>(*this);
}

template <typename TDerived>
TDerived& TRawOperationIoTableSpec<TDerived>::SetOutput(size_t tableIndex, const TRichYPath& path)
{
    NDetail::Assign(Outputs_, tableIndex, path);
}

template <typename TDerived>
const TVector<TRichYPath>& TRawOperationIoTableSpec<TDerived>::GetInputs() const
{
    return Inputs_;
}

template <typename TDerived>
const TVector<TRichYPath>& TRawOperationIoTableSpec<TDerived>::GetOutputs() const
{
    return Outputs_;
}

////////////////////////////////////////////////////////////////////////////////

template <typename TDerived>
TDerived& TRawMapReduceOperationIoSpec<TDerived>::AddMapOutput(const TRichYPath& path)
{
    MapOutputs_.push_back(path);
    return static_cast<TDerived&>(*this);
}

template <typename TDerived>
TDerived& TRawMapReduceOperationIoSpec<TDerived>::SetMapOutput(size_t tableIndex, const TRichYPath& path)
{
    NDetail::Assign(MapOutputs_, tableIndex, path);
}

template <typename TDerived>
const TVector<TRichYPath>& TRawMapReduceOperationIoSpec<TDerived>::GetMapOutputs() const
{
    return MapOutputs_;
}

////////////////////////////////////////////////////////////////////////////////

::TIntrusivePtr<INodeReaderImpl> CreateJobNodeReader(TRawTableReaderPtr rawTableReader);
::TIntrusivePtr<IYaMRReaderImpl> CreateJobYaMRReader(TRawTableReaderPtr rawTableReader);
::TIntrusivePtr<IProtoReaderImpl> CreateJobProtoReader(TRawTableReaderPtr rawTableReader);

::TIntrusivePtr<INodeWriterImpl> CreateJobNodeWriter(THolder<IProxyOutput> rawTableWriter);
::TIntrusivePtr<IYaMRWriterImpl> CreateJobYaMRWriter(THolder<IProxyOutput> rawTableWriter);
::TIntrusivePtr<IProtoWriterImpl> CreateJobProtoWriter(THolder<IProxyOutput> rawTableWriter);

////////////////////////////////////////////////////////////////////////////////

template <class T>
inline ::TIntrusivePtr<typename TRowTraits<T>::IReaderImpl> CreateJobReaderImpl(TRawTableReaderPtr rawTableReader);

template <>
inline ::TIntrusivePtr<INodeReaderImpl> CreateJobReaderImpl<TNode>(TRawTableReaderPtr rawTableReader)
{
    return CreateJobNodeReader(rawTableReader);
}

template <>
inline ::TIntrusivePtr<IYaMRReaderImpl> CreateJobReaderImpl<TYaMRRow>(TRawTableReaderPtr rawTableReader)
{
    return CreateJobYaMRReader(rawTableReader);
}

template <>
inline ::TIntrusivePtr<IProtoReaderImpl> CreateJobReaderImpl<Message>(TRawTableReaderPtr rawTableReader)
{
    return CreateJobProtoReader(rawTableReader);
}

template <class T>
inline ::TIntrusivePtr<typename TRowTraits<T>::IReaderImpl> CreateJobReaderImpl(TRawTableReaderPtr rawTableReader)
{
    if constexpr (TIsBaseOf<Message, T>::Value || NDetail::TIsProtoOneOf<T>::value) {
        return CreateJobProtoReader(rawTableReader);
    } else {
        static_assert(TDependentFalse<T>, "Unknown row type");
    }
}

template <class T>
inline TTableReaderPtr<T> CreateJobReader(TRawTableReaderPtr rawTableReader)
{
    return new TTableReader<T>(CreateJobReaderImpl<T>(rawTableReader));
}

////////////////////////////////////////////////////////////////////////////////

template <class T>
TTableWriterPtr<T> CreateJobWriter(THolder<IProxyOutput> rawJobWriter);

template <>
inline TTableWriterPtr<TNode> CreateJobWriter<TNode>(THolder<IProxyOutput> rawJobWriter)
{
    return new TTableWriter<TNode>(CreateJobNodeWriter(std::move(rawJobWriter)));
}

template <>
inline TTableWriterPtr<TYaMRRow> CreateJobWriter<TYaMRRow>(THolder<IProxyOutput> rawJobWriter)
{
    return new TTableWriter<TYaMRRow>(CreateJobYaMRWriter(std::move(rawJobWriter)));
}

template <>
inline TTableWriterPtr<Message> CreateJobWriter<Message>(THolder<IProxyOutput> rawJobWriter)
{
    return new TTableWriter<Message>(CreateJobProtoWriter(std::move(rawJobWriter)));
}

template <class T, class = void>
struct TProtoWriterCreator;

template <class T>
struct TProtoWriterCreator<T, std::enable_if_t<TIsBaseOf<Message, T>::Value>>
{
    static TTableWriterPtr<T> Create(::TIntrusivePtr<IProtoWriterImpl> writer)
    {
        return new TTableWriter<T>(writer);
    }
};

template <class T>
inline TTableWriterPtr<T> CreateJobWriter(THolder<IProxyOutput> rawJobWriter)
{
    if constexpr (TIsBaseOf<Message, T>::Value) {
        return TProtoWriterCreator<T>::Create(CreateJobProtoWriter(std::move(rawJobWriter)));
    } else {
        static_assert(TDependentFalse<T>, "Unknown row type");
    }
}

////////////////////////////////////////////////////////////////////////////////

template <class T>
void TOperationInputSpecBase::AddInput(const TRichYPath& path)
{
    Inputs_.push_back(path);
    StructuredInputs_.emplace_back(Structured<T>(path));
}

template <class T>
void TOperationInputSpecBase::SetInput(size_t tableIndex, const TRichYPath& path)
{
    NDetail::Assign(Inputs_, tableIndex, path);
    NDetail::Assign(StructuredInputs_, tableIndex, Structured<T>(path));
}


template <class T>
void TOperationOutputSpecBase::AddOutput(const TRichYPath& path)
{
    Outputs_.push_back(path);
    StructuredOutputs_.emplace_back(Structured<T>(path));
}

template <class T>
void TOperationOutputSpecBase::SetOutput(size_t tableIndex, const TRichYPath& path)
{
    NDetail::Assign(Outputs_, tableIndex, path);
    NDetail::Assign(StructuredOutputs_, tableIndex, Structured<T>(path));
}

template <class TDerived>
template <class T>
TDerived& TOperationIOSpec<TDerived>::AddInput(const TRichYPath& path)
{
    static_assert(!std::is_same<T, Message>::value, "input type can't be Message, it can only be its strict subtype (see st.yandex-team.ru/YT-7609)");
    TOperationInputSpecBase::AddInput<T>(path);
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
template <class T>
TDerived& TOperationIOSpec<TDerived>::SetInput(size_t tableIndex, const TRichYPath& path)
{
    static_assert(!std::is_same<T, Message>::value, "input type can't be Message, it can only be its strict subtype (see st.yandex-team.ru/YT-7609)");
    TOperationInputSpecBase::SetInput<T>(tableIndex, path);
    return *static_cast<TDerived*>(this);
}


template <class TDerived>
template <class T>
TDerived& TOperationIOSpec<TDerived>::AddOutput(const TRichYPath& path)
{
    static_assert(!std::is_same<T, Message>::value, "output type can't be Message, it can only be its strict subtype (see st.yandex-team.ru/YT-7609)");
    TOperationOutputSpecBase::AddOutput<T>(path);
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
template <class T>
TDerived& TOperationIOSpec<TDerived>::SetOutput(size_t tableIndex, const TRichYPath& path)
{
    static_assert(!std::is_same<T, Message>::value, "output type can't be Message, it can only be its strict subtype (see st.yandex-team.ru/YT-7609)");
    TOperationOutputSpecBase::SetOutput<T>(tableIndex, path);
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
TDerived& TOperationIOSpec<TDerived>::AddStructuredInput(TStructuredTablePath path)
{
    TOperationInputSpecBase::AddStructuredInput(std::move(path));
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
TDerived& TOperationIOSpec<TDerived>::AddStructuredOutput(TStructuredTablePath path)
{
    TOperationOutputSpecBase::AddStructuredOutput(std::move(path));
    return *static_cast<TDerived*>(this);
}

////////////////////////////////////////////////////////////////////////////////

template <class T>
TVanillaTask& TVanillaTask::AddOutput(const TRichYPath& path)
{
    static_assert(!std::is_same<T, Message>::value, "output type can't be Message, it can only be its strict subtype (see st.yandex-team.ru/YT-7609)");
    TOperationOutputSpecBase::AddOutput<T>(path);
    return *this;
}

template <class T>
TVanillaTask& TVanillaTask::SetOutput(size_t tableIndex, const TRichYPath& path)
{
    static_assert(!std::is_same<T, Message>::value, "output type can't be Message, it can only be its strict subtype (see st.yandex-team.ru/YT-7609)");
    TOperationOutputSpecBase::SetOutput<T>(tableIndex, path);
    return *this;
}

////////////////////////////////////////////////////////////////////////////////

namespace NDetail {

void ResetUseClientProtobuf(const char* methodName);

} // namespace NDetail

template <class TDerived>
TDerived& TOperationIOSpec<TDerived>::AddProtobufInput_VerySlow_Deprecated(const TRichYPath& path)
{
    NDetail::ResetUseClientProtobuf("AddProtobufInput_VerySlow_Deprecated");
    Inputs_.push_back(path);
    StructuredInputs_.emplace_back(TStructuredTablePath(path, TProtobufTableStructure{nullptr}));
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
TDerived& TOperationIOSpec<TDerived>::AddProtobufOutput_VerySlow_Deprecated(const TRichYPath& path)
{
    NDetail::ResetUseClientProtobuf("AddProtobufOutput_VerySlow_Deprecated");
    Outputs_.push_back(path);
    StructuredOutputs_.emplace_back(TStructuredTablePath(path, TProtobufTableStructure{nullptr}));
    return *static_cast<TDerived*>(this);
}

////////////////////////////////////////////////////////////////////////////////

template <typename TRow>
TJobOperationPreparer::TInputGroup& TJobOperationPreparer::TInputGroup::Description()
{
    for (auto i : Indices_) {
        Preparer_.InputDescription<TRow>(i);
    }
    return *this;
}

template <typename TRow>
TJobOperationPreparer::TOutputGroup& TJobOperationPreparer::TOutputGroup::Description(bool inferSchema)
{
    for (auto i : Indices_) {
        Preparer_.OutputDescription<TRow>(i, inferSchema);
    }
    return *this;
}

////////////////////////////////////////////////////////////////////////////////

template <typename TCont>
TJobOperationPreparer::TInputGroup TJobOperationPreparer::BeginInputGroup(const TCont& indices)
{
    for (auto i : indices) {
        ValidateInputTableIndex(i, TStringBuf("BeginInputGroup()"));
    }
    return TInputGroup(*this, TVector<int>(std::begin(indices), std::end(indices)));
}

template <typename TCont>
TJobOperationPreparer::TOutputGroup TJobOperationPreparer::BeginOutputGroup(const TCont& indices)
{
    for (auto i : indices) {
        ValidateOutputTableIndex(i, TStringBuf("BeginOutputGroup()"));
    }
    return TOutputGroup(*this, indices);
}


template <typename TRow>
TJobOperationPreparer& TJobOperationPreparer::InputDescription(int tableIndex)
{
    ValidateMissingInputDescription(tableIndex);
    InputTableDescriptions_[tableIndex] = StructuredTableDescription<TRow>();
    return *this;
}

template <typename TRow>
TJobOperationPreparer& TJobOperationPreparer::OutputDescription(int tableIndex, bool inferSchema)
{
    ValidateMissingOutputDescription(tableIndex);
    OutputTableDescriptions_[tableIndex] = StructuredTableDescription<TRow>();
    if (inferSchema && !OutputSchemas_[tableIndex]) {
        OutputSchemas_[tableIndex] = CreateTableSchema<TRow>();
    }
    return *this;
}

////////////////////////////////////////////////////////////////////////////////

template <class TDerived>
template <class TRow>
TDerived& TIntermediateTablesHintSpec<TDerived>::HintMapOutput()
{
    IntermediateMapOutputDescription_ = StructuredTableDescription<TRow>();
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
template <class TRow>
TDerived& TIntermediateTablesHintSpec<TDerived>::AddMapOutput(const TRichYPath& path)
{
    MapOutputs_.push_back(path);
    StructuredMapOutputs_.emplace_back(Structured<TRow>(path));
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
template <class TRow>
TDerived& TIntermediateTablesHintSpec<TDerived>::HintReduceCombinerInput()
{
    IntermediateReduceCombinerInputDescription_ = StructuredTableDescription<TRow>();
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
template <class TRow>
TDerived& TIntermediateTablesHintSpec<TDerived>::HintReduceCombinerOutput()
{
    IntermediateReduceCombinerOutputDescription_ = StructuredTableDescription<TRow>();
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
template <class TRow>
TDerived& TIntermediateTablesHintSpec<TDerived>::HintReduceInput()
{
    IntermediateReducerInputDescription_ = StructuredTableDescription<TRow>();
    return *static_cast<TDerived*>(this);
}

template <class TDerived>
const TVector<TStructuredTablePath>& TIntermediateTablesHintSpec<TDerived>::GetStructuredMapOutputs() const
{
    return StructuredMapOutputs_;
}

template <class TDerived>
const TMaybe<TTableStructure>& TIntermediateTablesHintSpec<TDerived>::GetIntermediateMapOutputDescription() const
{
    return IntermediateMapOutputDescription_;
}

template <class TDerived>
const TMaybe<TTableStructure>& TIntermediateTablesHintSpec<TDerived>::GetIntermediateReduceCombinerInputDescription() const
{
    return IntermediateReduceCombinerInputDescription_;
}

template <class TDerived>
const TMaybe<TTableStructure>& TIntermediateTablesHintSpec<TDerived>::GetIntermediateReduceCombinerOutputDescription() const
{
    return IntermediateReduceCombinerOutputDescription_;
}

template <class TDerived>
const TMaybe<TTableStructure>& TIntermediateTablesHintSpec<TDerived>::GetIntermediateReducerInputDescription() const
{
    return IntermediateReducerInputDescription_;
}

////////////////////////////////////////////////////////////////////////////////

struct TReducerContext
{
    bool Break = false;
    static TReducerContext* Get() { return Singleton<TReducerContext>(); }
};

template <class TR, class TW>
inline void IReducer<TR, TW>::Break()
{
    TReducerContext::Get()->Break = true;
}

template <typename TReader, typename TWriter>
void FeedJobInput(
    IMapper<TReader, TWriter>* mapper,
    typename TRowTraits<typename TReader::TRowType>::IReaderImpl* readerImpl,
    TWriter* writer)
{
    using TInputRow = typename TReader::TRowType;

    auto reader = MakeIntrusive<TTableReader<TInputRow>>(readerImpl);
    mapper->Do(reader.Get(), writer);
}

template <typename TReader, typename TWriter>
void FeedJobInput(
    IReducer<TReader, TWriter>* reducer,
    typename TRowTraits<typename TReader::TRowType>::IReaderImpl* readerImpl,
    TWriter* writer)
{
    using TInputRow = typename TReader::TRowType;

    auto rangesReader = MakeIntrusive<TTableRangesReader<TInputRow>>(readerImpl);
    for (; rangesReader->IsValid(); rangesReader->Next()) {
        reducer->Do(&rangesReader->GetRange(), writer);
        if (TReducerContext::Get()->Break) {
            break;
        }
    }
}

template <typename TReader, typename TWriter>
void FeedJobInput(
    IAggregatorReducer<TReader, TWriter>* reducer,
    typename TRowTraits<typename TReader::TRowType>::IReaderImpl* readerImpl,
    TWriter* writer)
{
    using TInputRow = typename TReader::TRowType;

    auto rangesReader = MakeIntrusive<TTableRangesReader<TInputRow>>(readerImpl);
    reducer->Do(rangesReader.Get(), writer);
}

template <class TRawJob>
int RunRawJob(size_t outputTableCount, IInputStream& jobStateStream)
{
    TRawJobContext context(outputTableCount);

    TRawJob job;
    job.Load(jobStateStream);
    job.Do(context);
    return 0;
}

template <>
inline int RunRawJob<TCommandRawJob>(size_t /* outputTableCount */, IInputStream& /* jobStateStream */)
{
    Y_ABORT();
}

template <class TVanillaJob>
int RunVanillaJob(size_t outputTableCount, IInputStream& jobStateStream)
{
    TVanillaJob job;
    job.Load(jobStateStream);

    if constexpr (std::is_base_of<IVanillaJob<>, TVanillaJob>::value) {
        Y_ABORT_UNLESS(outputTableCount == 0, "Void vanilla job expects zero 'outputTableCount'");
        job.Do();
    } else {
        Y_ABORT_UNLESS(outputTableCount, "Vanilla job with table writer expects nonzero 'outputTableCount'");
        using TOutputRow = typename TVanillaJob::TWriter::TRowType;

        THolder<IProxyOutput> rawJobWriter;
        if (auto customWriter = job.CreateCustomRawJobWriter(outputTableCount)) {
            rawJobWriter = std::move(customWriter);
        } else {
            rawJobWriter = CreateRawJobWriter(outputTableCount);
        }
        auto writer = CreateJobWriter<TOutputRow>(std::move(rawJobWriter));

        job.Start(writer.Get());
        job.Do(writer.Get());
        job.Finish(writer.Get());

        writer->Finish();
    }
    return 0;
}

template <>
inline int RunVanillaJob<TCommandVanillaJob>(size_t /* outputTableCount */, IInputStream& /* jobStateStream */)
{
    Y_ABORT();
}

template <class TJob>
    requires TIsBaseOf<IStructuredJob, TJob>::Value
int RunJob(size_t outputTableCount, IInputStream& jobStateStream)
{
    using TInputRow = typename TJob::TReader::TRowType;
    using TOutputRow = typename TJob::TWriter::TRowType;

    auto job = MakeIntrusive<TJob>();
    job->Load(jobStateStream);

    TRawTableReaderPtr rawJobReader;
    if (auto customReader = job->CreateCustomRawJobReader(/*fd*/ 0)) {
        rawJobReader = customReader;
    } else {
        rawJobReader = CreateRawJobReader(/*fd*/ 0);
    }
    auto readerImpl = CreateJobReaderImpl<TInputRow>(rawJobReader);

    // Many users don't expect to have jobs with empty input so we skip such jobs.
    if (!readerImpl->IsValid()) {
        return 0;
    }

    THolder<IProxyOutput> rawJobWriter;
    if (auto customWriter = job->CreateCustomRawJobWriter(outputTableCount)) {
        rawJobWriter = std::move(customWriter);
    } else {
        rawJobWriter = CreateRawJobWriter(outputTableCount);
    }
    auto writer = CreateJobWriter<TOutputRow>(std::move(rawJobWriter));

    job->Start(writer.Get());
    FeedJobInput(job.Get(), readerImpl.Get(), writer.Get());
    job->Finish(writer.Get());

    writer->Finish();

    return 0;
}

//
// We leave RunMapJob/RunReduceJob/RunAggregatorReducer for backward compatibility,
// some user use them already. :(

template <class TMapper>
int RunMapJob(size_t outputTableCount, IInputStream& jobStateStream)
{
    return RunJob<TMapper>(outputTableCount, jobStateStream);
}

template <class TReducer>
int RunReduceJob(size_t outputTableCount, IInputStream& jobStateStream)
{
    return RunJob<TReducer>(outputTableCount, jobStateStream);
}

template <class TReducer>
int RunAggregatorReducer(size_t outputTableCount, IInputStream& jobStateStream)
{
    return RunJob<TReducer>(outputTableCount, jobStateStream);
}

////////////////////////////////////////////////////////////////////////////////

template <typename T, typename = void>
struct TIsConstructibleFromNode
    : std::false_type
{ };

template <typename T>
struct TIsConstructibleFromNode<T, std::void_t<decltype(T::FromNode(std::declval<TNode&>()))>>
    : std::true_type
{ };

template <class TJob>
::TIntrusivePtr<NYT::IStructuredJob> ConstructJobFromNode(const TNode& node)
{
    if constexpr (TIsConstructibleFromNode<TJob>::value) {
        Y_ENSURE(node.GetType() != TNode::Undefined,
            "job has FromNode method but constructor arguments were not provided");
        return TJob::FromNode(node);
    } else {
        Y_ENSURE(node.GetType() == TNode::Undefined,
            "constructor arguments provided but job does not contain FromNode method");
        return MakeIntrusive<TJob>();
    }
}

////////////////////////////////////////////////////////////////////////////////

using TJobFunction = int (*)(size_t, IInputStream&);
using TConstructJobFunction = ::TIntrusivePtr<NYT::IStructuredJob> (*)(const TNode&);

class TJobFactory
{
public:
    static TJobFactory* Get()
    {
        return Singleton<TJobFactory>();
    }

    template <class TJob>
    void RegisterJob(const char* name)
    {
        RegisterJobImpl<TJob>(name, RunJob<TJob>);
        JobConstructors[name] = ConstructJobFromNode<TJob>;
    }

    template <class TRawJob>
    void RegisterRawJob(const char* name)
    {
        RegisterJobImpl<TRawJob>(name, RunRawJob<TRawJob>);
    }

    template <class TVanillaJob>
    void RegisterVanillaJob(const char* name)
    {
        RegisterJobImpl<TVanillaJob>(name, RunVanillaJob<TVanillaJob>);
    }

    TString GetJobName(const IJob* job)
    {
        const auto typeIndex = std::type_index(typeid(*job));
        CheckJobRegistered(typeIndex);
        return JobNames[typeIndex];
    }

    TJobFunction GetJobFunction(const char* name)
    {
        CheckNameRegistered(name);
        return JobFunctions[name];
    }

    TConstructJobFunction GetConstructingFunction(const char* name)
    {
        CheckNameRegistered(name);
        return JobConstructors[name];
    }

private:
    TMap<std::type_index, TString> JobNames;
    THashMap<TString, TJobFunction> JobFunctions;
    THashMap<TString, TConstructJobFunction> JobConstructors;

    template <typename TJob, typename TRunner>
    void RegisterJobImpl(const char* name, TRunner runner) {
        const auto typeIndex = std::type_index(typeid(TJob));
        CheckNotRegistered(typeIndex, name);
        JobNames[typeIndex] = name;
        JobFunctions[name] = runner;
    }

    void CheckNotRegistered(const std::type_index& typeIndex, const char* name)
    {
        Y_ENSURE(!JobNames.contains(typeIndex),
            "type_info '" << typeIndex.name() << "'"
            "is already registered under name '" << JobNames[typeIndex] << "'");
        Y_ENSURE(!JobFunctions.contains(name),
            "job with name '" << name << "' is already registered");
    }

    void CheckJobRegistered(const std::type_index& typeIndex)
    {
        Y_ENSURE(JobNames.contains(typeIndex),
            "type_info '" << typeIndex.name() << "' is not registered, use REGISTER_* macros");
    }

    void CheckNameRegistered(const char* name)
    {
        Y_ENSURE(JobFunctions.contains(name),
            "job with name '" << name << "' is not registered, use REGISTER_* macros");
    }
};

////////////////////////////////////////////////////////////////////////////////

template <class TMapper>
struct TMapperRegistrator
{
    TMapperRegistrator(const char* name)
    {
        static_assert(TMapper::JobType == IJob::EType::Mapper,
            "REGISTER_MAPPER is not compatible with this job class");

        NYT::TJobFactory::Get()->RegisterJob<TMapper>(name);
    }
};

template <class TReducer>
struct TReducerRegistrator
{
    TReducerRegistrator(const char* name)
    {
        static_assert(TReducer::JobType == IJob::EType::Reducer ||
            TReducer::JobType == IJob::EType::ReducerAggregator,
            "REGISTER_REDUCER is not compatible with this job class");

        NYT::TJobFactory::Get()->RegisterJob<TReducer>(name);
    }
};

template <class TRawJob>
struct TRawJobRegistrator
{
    TRawJobRegistrator(const char* name)
    {
        static_assert(TRawJob::JobType == IJob::EType::RawJob,
            "REGISTER_RAW_JOB is not compatible with this job class");
        NYT::TJobFactory::Get()->RegisterRawJob<TRawJob>(name);
    }
};

template <class TVanillaJob>
struct TVanillaJobRegistrator
{
    TVanillaJobRegistrator(const char* name)
    {
        static_assert(TVanillaJob::JobType == IJob::EType::VanillaJob,
            "REGISTER_VANILLA_JOB is not compatible with this job class");
        NYT::TJobFactory::Get()->RegisterVanillaJob<TVanillaJob>(name);
    }
};

////////////////////////////////////////////////////////////////////////////////

inline TString YtRegistryTypeName(const TString& name) {
    TString res = name;
#ifdef _win_
    SubstGlobal(res, "class ", "");
#endif
    return res;
}

////////////////////////////////////////////////////////////////////////////////

#define REGISTER_MAPPER(...) \
static const NYT::TMapperRegistrator<__VA_ARGS__> \
Y_GENERATE_UNIQUE_ID(TJobRegistrator)(NYT::YtRegistryTypeName(TypeName<__VA_ARGS__>()).data());

#define REGISTER_NAMED_MAPPER(name, ...) \
static const NYT::TMapperRegistrator<__VA_ARGS__> \
Y_GENERATE_UNIQUE_ID(TJobRegistrator)(name);

#define REGISTER_REDUCER(...) \
static const NYT::TReducerRegistrator<__VA_ARGS__> \
Y_GENERATE_UNIQUE_ID(TJobRegistrator)(NYT::YtRegistryTypeName(TypeName<__VA_ARGS__>()).data());

#define REGISTER_NAMED_REDUCER(name, ...) \
static const NYT::TReducerRegistrator<__VA_ARGS__> \
Y_GENERATE_UNIQUE_ID(TJobRegistrator)(name);

#define REGISTER_NAMED_RAW_JOB(name, ...) \
static const NYT::TRawJobRegistrator<__VA_ARGS__> \
Y_GENERATE_UNIQUE_ID(TJobRegistrator)(name);

#define REGISTER_RAW_JOB(...) \
REGISTER_NAMED_RAW_JOB((NYT::YtRegistryTypeName(TypeName<__VA_ARGS__>()).data()), __VA_ARGS__)

#define REGISTER_NAMED_VANILLA_JOB(name, ...) \
static NYT::TVanillaJobRegistrator<__VA_ARGS__> \
Y_GENERATE_UNIQUE_ID(TJobRegistrator)(name);

#define REGISTER_VANILLA_JOB(...) \
REGISTER_NAMED_VANILLA_JOB((NYT::YtRegistryTypeName(TypeName<__VA_ARGS__>()).data()), __VA_ARGS__)

////////////////////////////////////////////////////////////////////////////////

template <typename TReader, typename TWriter>
TStructuredRowStreamDescription IMapper<TReader, TWriter>::GetInputRowStreamDescription() const
{
    return NYT::NDetail::GetStructuredRowStreamDescription<typename TReader::TRowType>();
}

template <typename TReader, typename TWriter>
TStructuredRowStreamDescription IMapper<TReader, TWriter>::GetOutputRowStreamDescription() const
{
    return NYT::NDetail::GetStructuredRowStreamDescription<typename TWriter::TRowType>();
}

////////////////////////////////////////////////////////////////////////////////

template <typename TReader, typename TWriter>
TStructuredRowStreamDescription IReducer<TReader, TWriter>::GetInputRowStreamDescription() const
{
    return NYT::NDetail::GetStructuredRowStreamDescription<typename TReader::TRowType>();
}

template <typename TReader, typename TWriter>
TStructuredRowStreamDescription IReducer<TReader, TWriter>::GetOutputRowStreamDescription() const
{
    return NYT::NDetail::GetStructuredRowStreamDescription<typename TWriter::TRowType>();
}

////////////////////////////////////////////////////////////////////////////////

template <typename TReader, typename TWriter>
TStructuredRowStreamDescription IAggregatorReducer<TReader, TWriter>::GetInputRowStreamDescription() const
{
    return NYT::NDetail::GetStructuredRowStreamDescription<typename TReader::TRowType>();
}

template <typename TReader, typename TWriter>
TStructuredRowStreamDescription IAggregatorReducer<TReader, TWriter>::GetOutputRowStreamDescription() const
{
    return NYT::NDetail::GetStructuredRowStreamDescription<typename TWriter::TRowType>();
}

////////////////////////////////////////////////////////////////////////////////

template <typename TWriter>
TStructuredRowStreamDescription IVanillaJob<TWriter>::GetInputRowStreamDescription() const
{
    return TVoidStructuredRowStream();
}

template <typename TWriter>
TStructuredRowStreamDescription IVanillaJob<TWriter>::GetOutputRowStreamDescription() const
{
    return NYT::NDetail::GetStructuredRowStreamDescription<typename TWriter::TRowType>();
}

////////////////////////////////////////////////////////////////////////////////

} // namespace NYT