ydb/yt/cpp/mapreduce/interface, branch main

YT-27970: add opt-in native client side multiplexing

2026-07-19T13:32:19Z

commit_hash:87de51fe271596eaf0354bc99ef472e3a3c29d0f

YT-28161: Add Commit options

2026-07-18T10:04:56Z

commit_hash:254111f674ff4126bd7781741ad035f436bfa073

YT-28451: Add tagged logging API and opaque event payload

2026-07-17T09:07:46Z

Replace `TLogEvent::MessageRef` with an opaque `Payload` that carries the message together with structured key/value tags, deferring tag rendering to the consumer (logging thread). - Add the `TTaggedPayloadWriter`/`TTaggedPayloadReader` codec (`NDetail`), with a per-thread chunk-cached builder so tagged logging does no per-message heap allocation. - Model the payload as a typed `TLogEventPayload` — a `std::variant` of the opaque strong typedefs `TTaggedLogEventPayload` and `TStructuredLogEventPayload` (each over `TSharedRef`). The active alternative identifies the event kind, so the separate `ELogMessageKind` enum and `TLogEvent::MessageKind` field are removed; consumers dispatch via `std::holds_alternative`/`std::get` instead of a tag. - Add the fluent `YT_TLOG_*` API: `YT_TLOG_INFO("Message").With(key, value)` and `.With(key, value, "%spec")`; disabled levels skip argument evaluation. - Add well-known tags: `.With(value)` attaches a value under a statically known key resolved by ADL (e.g. `.With(error)` for the `Error` tag). - Teach the plain-text and structured formatters to render tags; add the `enable_native_tags` knob to emit tags into a nested structured attribute. - Add producer-side benchmarks. The tagged API is cheaper than `YT_LOG_*` for tagged calls and on par for tag-free ones: #| || **Producer call** | **`YT_LOG_*`** | **`YT_TLOG_*`** | **Δ** || || no tags | 81 ns | 82 ns | +2% || || 1 tag | 124 ns | 88 ns | -29% || || 2 tags | 140 ns | 101 ns | -28% || || 3 tags | 372 ns | 283 ns | -24% || |# -- #| || **![](https://nda.ya.ru/t/mAiQIjHx7Mm3JC =30x) Echo tests** || |# commit_hash:70efc90e5c2b71e5311415a4e4508db42ff28971

Revert "YT-27827: TPingerTransaction use BlockingGet instead of WaitFor in destructor"

2026-07-03T20:23:22Z

This reverts commit 90bbe36635e0d48c81c153567dcedf28f103efbe, reversing changes made to 270d7be117d1eacc9c8aff93d9aaeb510fa910e2. commit_hash:23c13dd27b089f56e049580d1416d17a22c4bc80

retry MasterDisconnected error

2026-07-01T06:09:04Z

commit_hash:c69288b219a7b906cc9427b23ddc599f149fb77c

YT-28380: Add CheckClusterLiveness to C++ SDK

2026-06-15T10:54:52Z

* Changelog entry Type: feature Component: cpp-sdk Add CheckClusterLiveness handle commit_hash:9b3f23b70fb639693a67edbe9ed2b80683fea61b

YT-28419: Drop redundant guard #undef from -inl.h files

2026-06-14T11:11:09Z

The `.h` owns the #undef of its `_INL_H_` guard; duplicating it in the `-inl.h` is redundant. Align the minority that did so with the majority. commit_hash:51be59f9d1b93ad152ed5cb07c76088edd6c3e36

YT-28161: Prerequisite options for cypress and transactions request

2026-06-09T08:41:45Z

* Changelog entry Type: fix Component: cpp-sdk Add prerequisite options for cypress and transactions requests. commit_hash:4288a35e2237cfaa015ff3990e2be909d18cd6b0

add LockType option to TInsertRowsOptions in yt/cpp/mapreduce

2026-05-30T10:39:17Z

YT-драйвер уже принимает параметр lock_type для insert_rows (), но C\+\+ mapreduce-клиент не пробрасывает его дальше, поэтому вызывающий код всегда использует ELockType::Exclusive. В груте есть задача инициализации табличных (внешних) счётчиков: тасклет считает map-reduce-ом дельты по всем владельцам и батчами пишет их в общую динтаблицу ( и аналоги), куда рантайм одновременно дописывает инкременты на каждое событие в источнике. Колонка `value` в такой таблице — aggregate-sum; рантайм через NApi пишет в неё с lock_type=shared_write, чтобы параллельные записи не конфликтовали. Тасклет инциализации счетчика же ходит через mapreduce-клиент и в нем тоже хочется уметь брать shared_write lock. (). commit_hash:7cbcd19f8d0532d6cf0e7f48abe197bb7fda99d3

YT-27970: Multiplexing for RPC requests

2026-05-20T09:55:06Z

* Changelog entry Type: fix Component: cpp-sdk Mark light and heavy RPC requests with different multiplexing bands. Only for PingTransaction for now commit_hash:9177c1e3811a5108933a87dd3f241d235490ce2d