[split 21/22] tests: race-condition suites for DDL waiter, offset commit, pause visibility (test-only) - #1376
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…ibility (test-only) Test-only. Merge after the executor PR. Multi-threaded race harnesses: concurrent DDL + batch threads against the schema-change waiter (DDLSchemaChangeWaiterRaceConditionTest, DDLFreezeRaceConditionTest), concurrent offset acknowledgement vs flush (OffsetCommitConcurrencyTest), executor pause visibility under the JMM (ExecutorPauseVisibilityTest), and lazy system-connection construction (LazySystemConnectionTest). Split from the executor PR only to respect the 10-file-per-PR limit. Part of the split of #1353 into independently mergeable sub-PRs (each <= 10 files), so the 2.10.0 branch can absorb the fixes incrementally.
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Stacked PR: based on the previous PR in the series (
omniwatcher/split-20-executor-cache); this PR's own diff is only its listed files. Merge the series in order; after the predecessor merges, retarget this PR to2.10.0.Test-only. Merge after the executor PR.
Multi-threaded race harnesses: concurrent DDL + batch threads against the schema-change waiter (DDLSchemaChangeWaiterRaceConditionTest, DDLFreezeRaceConditionTest), concurrent offset acknowledgement vs flush (OffsetCommitConcurrencyTest), executor pause visibility under the JMM (ExecutorPauseVisibilityTest), and lazy system-connection construction (LazySystemConnectionTest). Split from the executor PR only to respect the 10-file-per-PR limit.
Part of the split of #1353 into independently mergeable sub-PRs (each <= 10 files), so the 2.10.0 branch can absorb the fixes incrementally.
Split out of #1353, which this series replaces. Each sub-PR is <= 10 files; the union of all 22 reproduces the #1353 tree exactly (verified by tree SHA).