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

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

Generalize GetEnvValueOrThrow with a typed conversion overload

2026-06-03T08:26:50Z

Add a templated GetEnvValueOrThrow that parses the environment variable value via FromString, next to the existing std::string overload. commit_hash:0421b0463c473c8c7f88c0b1619484e52b002897

Extract environment variables helpers to library/cpp/yt/system

2026-05-01T12:04:18Z

commit_hash:5a11a7288f325d6fa0a9bec9a1ce0b7afa1f4984

YT-18571: Refactor environ helpers

2025-11-02T16:05:26Z

commit_hash:72977e13820ded4a38d19076b1d336c9bb910dbf

Refactor local host name and YP cluster functions

2025-02-02T09:43:24Z

commit_hash:a4ecfb1e06e82ba192646d3ab5417cb3f0c6991f

YT-21233: Adjust (To/From)ErrorAttributeValue CPOs, revert ConvertTo becoming CPO, move TErrorCode and TError to library/cpp/yt/error

2024-12-25T04:31:55Z

\[nodiff:caesar\] List of changes: 1) Make `ConvertTo` a normal function again (basically, a revert of previous change). It turned out to be very inconvenient entry point 2) Introduce concept for "Primitive types" which are handled without yt/core module. Please note that inclusion of core **does not** affect work with primitive types (otherwise we would be facing and ODR violation). These are numerics, duration, instant, string-like objects and guid 3) Introduce `FromErrorAttributeValue` which is a substitute to `ConvertTo` with special behavior (see below) 4) Scheme for (de-)serialization has changed: 1) Primitive types are handled via `ConvertToTextYsonString` and `ConvertFromTextYsonString` 2) Other types are not supported without yt/core. Otherwise `ConvertToYsonString(value, EYsonFormat::Text)` used for serialization and `ConvertTo(value)` for deserialization. 5) New format of attribute value storage allows to not care about concrete type of the attribute (text yson strings can be detected since they start with `\"` and deserialized so are text yson bools, everything else is already human readable). This drops dependency on `TTokenizer` 6) Some small parts (e.g. enums or constants or aliases) of yt/core/misc files were moved to library/cpp/yt/\* locations and re-included to drop dependencies of stripped\_error on them 7) `TErrorAttributes` is now a simple hash map instead of a handle to `IAttributeDictionary` 8) `ExtractFromAttributes` weak symbol is finally moved to library/cpp/yt/error due to point 9 allowing to fully drop dependency on `IAttributeDictionary`. Combined with point 7 this drops dep on yt/core/ytree altogether 9) Moved `TErrorCode` to library/cpp/yt/error. There is a logger there which forces dep on library/cpp/yt/logging. It is not required really, and can be later removed 10) Moved `TError` with format and macroes to library/cpp/yt/error. It still (and probably forever will) depend on yson. What can be done next: Switch TYsonString to TString and move ConvertTo/FromTextYsonString to library/cpp/yt/error. This would remove dep on library/cpp/yt/yson\_string commit_hash:6f11dc478ab782a1f98a5aedcd45a4800d3f4e7b

Better diagnostics in AbortProcess(Silently|Dramatically)

2024-11-06T11:01:26Z

commit_hash:7bbc13afbd569ca9bb064aed656c12644fd2de96

Refactor and unify exit codes

2024-08-02T09:18:17Z

ec1d0c473e709e8aad76b4e190a75ad4125a9ce2

YT-21566: Access thread local variables via noinline functions

2024-04-25T23:41:13Z

970c33b44a7bd166b2716d86d3d2053dcaf05d7d

feat contrib: aiogram 3

2024-01-19T10:10:03Z

Relates: https://st.yandex-team.ru/, https://st.yandex-team.ru/