[PR] [core] Fix flaky duplicate file discard test [paimon]

["QuakeWang (via GitHub)" <gi...@apache.org>]

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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Re: [PR] [core] Fix flaky duplicate file discard test [paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #8106:
URL: https://github.com/apache/paimon/pull/8106


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