Fix shutdown in db_stress with -test_batches_snapshots=1
#9313
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The `SharedState` constructor had an early return in case of `-test_batches_snapshots=1`. This early return caused `num_bg_threads_` to never be incremented. Consequently, the driver thread could cleanup objects like the `SharedState` while BG threads were still running, leading to crash. The fix is to move the logic for counting threads (both FG and BG) to the place they are launched. That way we can be sure they are consistent, at least for now. Test Plan: below command used to fail, now it passes. ``` $ ./db_stress --db=./test-db/ --expected_values_dir=./test-db-expected/ --max_key=100000 --ops_per_thread=1000 --sync_fault_injection=1 --clear_column_family_one_in=0 --destroy_db_initially=0 -reopen=0 -test_batches_snapshots=1 ```
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@ajkr has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator. |
jay-zhuang
approved these changes
Dec 18, 2021
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Thanks for the review! |
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The
SharedStateconstructor had an early return in case of-test_batches_snapshots=1. This early return causednum_bg_threads_to never be incremented. Consequently, the driver thread could cleanup
objects like the
SharedStatewhile BG threads were still running andaccessing it, leading to crash.
The fix is to move the logic for counting threads (both FG and BG) to
the place they are launched. That way we can be sure the counts are
consistent, at least for now.
Test Plan: below command used to fail, now it passes.