Yauheni Khatsianevich 1f5082d1ce tests(lwt): new test for LWT testing during tablet resize ...

– Workload: N workers perform CAS updates
 UPDATE … SET s{i}=new WHERE pk=? IF (∀j≠i: s{j}>=guard_j) AND s{i}=prev
 at CL=LOCAL_QUORUM / SERIAL=LOCAL_SERIAL. Non-apply without timeout is treated
 as contention; “uncertainty” timeouts are resolved via LOCAL_SERIAL read.
- Enable balancing and increase min_tablet_count to force split,
 flush and lower min_tablet_count to merge.
- “Uncertainty” timeouts (write timeout due to uncertainty) are resolved via a
LOCAL_SERIAL read to determine whether the CAS actually applied.
- Invariants: after the run, for every pk and column s{i}, the stored value
equals the number of confirmed CAS by worker i (no lost or phantom updates)
despite ongoing tablet moves.

Closes scylladb/scylladb#26113

refs: scylladb/qa-tasks#1918
Refs #18068
Fixes #24502 (to satisfy backport rules)

(cherry picked from commit 99dc31e71a)

Closes scylladb/scylladb#26790

2025-11-04 12:47:24 +01:00

..

__init__.py

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lwt_common.py

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test_lwt_during_tablets_migration.py

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test_lwt_during_tablets_resize.py

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