ydb/library/cpp/yt/error, branch main

Make THROW_ERROR_EXCEPTION_UNLESS/IF chainable with error attributes

2026-07-21T06:52:42Z

commit_hash:4e76ece0b75ab787ed04b6be5f183cecbf9b8167

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

Fix use-after-free in TError during program shutdown

2026-07-12T15:55:57Z

--- Type: fix Component: library/cpp/yt/error Problem: TError::Enricher_ and TError::FromExceptionEnricher_ are static class members whose destructors are registered when error.cpp is loaded. However, if any code calls Singleton<>() during static initialization before error.cpp loads, the OnExit handler gets registered in standard atexit() first. Due to LIFO ordering, at program exit the enrichers are destroyed before OnExit() runs, but OnExit() then destroys Singletons whose destructors may create TError objects (e.g., to cancel futures), which invokes Enrich() on the already-destroyed std::function, causing use-after-free. This can lead to intermittent segfaults depending on the link order of translation units. Solution: Store enrichers in a LeakySingleton so they are never destroyed, as TError can be created anywhere including during program shutdown. --- Pull Request resolved: https://github.com/ytsaurus/ytsaurus/pull/1582 commit_hash:a9607f0094b4c60414d00ebca844db6a2ceafeb9

YT-22593: Reduce TString usage in core/misc

2026-06-06T22:31:50Z

commit_hash:ba8c42476d6274212745348071682042e780037f

Cache process/thread id getters and use them in TError origin capture

2026-06-06T21:16:49Z

## Motivation Profiling the YT master Automaton thread showed TOriginAttributes::Capture (run on every non-OK TError) spending ~60% of its time in a getpid() syscall — uncached on glibc >= 2.25. NYT::GetCurrentThreadId() (gettid) feeds hot thread-affinity / log-manager checks on the same thread. ## Changes - New library/cpp/yt/system/process_id.* with cached GetProcessId(); GetSystemThreadId() now caches the kernel tid in TLS. Both caches reset in the child after fork. - Moved thread_name.{h,cpp} from misc to system. - Removed GetCurrentProcessId/GetCurrentThreadId shims from yt/yt/core/misc/proc.{h,cpp}; migrated all callers to NYT::GetProcessId / NYT::GetSystemThreadId. - TOriginAttributes::Capture uses the cached getters; recorded Tid is now the real kernel tid (matches perf/ps). - Added microbenchmarks (library/cpp/yt/system/benchmarks, yt/yt/core/benchmarks/error.cpp). ## Microbenchmarks (release) | | before | after | |---|---|---| | getpid | 101 ns | 0.33 ns | | gettid | 102 ns | 1.64 ns | | Capture | 161 ns | 50 ns | | failed TError | 221 ns | 74 ns | commit_hash:ee37ae57d61a5a2dd33daee935270f4bb93b7ff9

YT-26105: Make TError aware of ::TSystemError

2026-05-25T08:19:52Z

commit_hash:ca6efe06865fe9fc9ebfd5ca8bbd79c2acbb4ff3

YT: Add missing 16bit types to TErrorAttribute conversions

2026-04-30T12:18:42Z

commit_hash:7e973890af2061e2a78b34d31c404f000375a88b

Use implicit bool conversion for null check in origin_attributes.cpp

2026-04-27T13:12:31Z

commit_hash:cc1f5b9ecc05f6b098f1645ba338fc644c0bb53f

Increase default error attributes string truncation limit to 32K

2026-04-17T21:44:40Z

commit_hash:da3595c17e930ef69088c3164f42adc50d57f283

Fix some use-after-move bugs

2026-04-17T13:37:33Z

commit_hash:4bc357937e76b2b082671bb0f67ac3012ee4dbca