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branch-4.0: [fix](be) Protect tablet writer map lookup in load channel #64604 - #64751
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branch-4.0: [fix](be) Protect tablet writer map lookup in load channel #64604#64751github-actions[bot] wants to merge 1 commit into
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hello-stephen
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Jun 23, 2026
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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hello-stephen
commented
Jun 23, 2026
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run buildall |
hello-stephen
commented
Jun 23, 2026
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BE Regression && UT Coverage ReportIncrement line coverage Increment coverage report
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morningman
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Jun 24, 2026
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PR approved by at least one committer and no changes requested. |
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PR approved by anyone and no changes requested. |
### What problem does this PR solve? Issue Number: None Related PR: #57133 Problem Summary: `BaseTabletsChannel::_write_block_data` can run concurrently with `incremental_open` for the same tablets channel. `_tablet_writers` is an `std::unordered_map` protected by `_tablet_writers_lock` when writers are inserted, but the tablet load rowset info lookup read the map without holding the lock. A concurrent `emplace` may rehash `_tablet_writers`, so the unlocked lookup can race with bucket reallocation. This patch protects the lookup with `_tablet_writers_lock` and avoids using unordered_map iterators after the lock is released. The actual writer operations still run outside `_tablet_writers_lock`, so the lock remains scoped to the map access.
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Cherry-picked from #64604