add rle v2 encoding for segment v2#2949
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1. reuse the rle encoding in alpha rowset 2. modify segment_test because of change of encoding
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If you just move the old code from the AlphaRowset, the question of AlphaRowset still exists.
This are all questions we start to build SegmentV2. |
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BiteTheDDDDt
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…S Agent lifetime race under high EPS (#64040) ### What problem does this PR solve? Issue Number: close 63193 Related PR: [#2949](apache/brpc#2949) Problem Summary: Under high throughput, a race condition in brpc's bvar subsystem causes a SIGSEGV during take_sample. When a thread's TLS Agent destructs after its owning AgentCombiner (Reducer, IntRecorder, or Percentile) has already been freed, the agent dereferences a dangling raw pointer in its destructor via combiner->commit_and_erase(this). The fix (backport of apache/brpc#2949) replaces the raw back-pointer from Agent to AgentCombiner with a weak_ptr, and makes the owning classes hold the combiner via shared_ptr. The agent destructor now calls combiner.lock() — if the combiner is already destroyed, lock() returns null and the destructor safely no-ops, eliminating the use-after-free.
github-actions Bot
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Jun 29, 2026
…S Agent lifetime race under high EPS (#64040) ### What problem does this PR solve? Issue Number: close 63193 Related PR: [#2949](apache/brpc#2949) Problem Summary: Under high throughput, a race condition in brpc's bvar subsystem causes a SIGSEGV during take_sample. When a thread's TLS Agent destructs after its owning AgentCombiner (Reducer, IntRecorder, or Percentile) has already been freed, the agent dereferences a dangling raw pointer in its destructor via combiner->commit_and_erase(this). The fix (backport of apache/brpc#2949) replaces the raw back-pointer from Agent to AgentCombiner with a weak_ptr, and makes the owning classes hold the combiner via shared_ptr. The agent destructor now calls combiner.lock() — if the combiner is already destroyed, lock() returns null and the destructor safely no-ops, eliminating the use-after-free.
github-actions Bot
pushed a commit
that referenced
this pull request
Jun 29, 2026
…S Agent lifetime race under high EPS (#64040) ### What problem does this PR solve? Issue Number: close 63193 Related PR: [#2949](apache/brpc#2949) Problem Summary: Under high throughput, a race condition in brpc's bvar subsystem causes a SIGSEGV during take_sample. When a thread's TLS Agent destructs after its owning AgentCombiner (Reducer, IntRecorder, or Percentile) has already been freed, the agent dereferences a dangling raw pointer in its destructor via combiner->commit_and_erase(this). The fix (backport of apache/brpc#2949) replaces the raw back-pointer from Agent to AgentCombiner with a weak_ptr, and makes the owning classes hold the combiner via shared_ptr. The agent destructor now calls combiner.lock() — if the combiner is already destroyed, lock() returns null and the destructor safely no-ops, eliminating the use-after-free.
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issue: #2886