QuakeWang opened a new pull request, #8106:
URL: https://github.com/apache/paimon/pull/8106
### Purpose
`testDiscardDuplicateFilesMultiThread` used random commit message selection
and an unbounded cached thread pool while stressing concurrent duplicate-file
commits. Under CI contention, the test could exhaust the default commit retry
limit and fail with an `ExecutionException`, making the result flaky and hard
to diagnose.
This PR makes the test deterministic, gives the stress case a bounded retry
configuration, shuts down the executor, and adds commit context to worker
failures.
### Tests
- `mvn -pl paimon-core -am -Pfast-build -DfailIfNoTests=false
-Dtest=AppendOnlySimpleTableTest#testDiscardDuplicateFilesMultiThread test`
- `mvn -pl paimon-core -am -DfailIfNoTests=false
-Dtest=AppendOnlySimpleTableTest#testDiscardDuplicateFilesMultiThread test`
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