Martijn Visser created FLINK-41393:
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             Summary: Remove the Hadoop 2 compatibility code
                 Key: FLINK-41393
                 URL: https://issues.apache.org/jira/browse/FLINK-41393
             Project: Flink
          Issue Type: Technical Debt
          Components: Connectors / Hadoop Compatibility
            Reporter: Martijn Visser
            Assignee: Martijn Visser


With FLINK-41378 merged, the minimum Hadoop version is 3.4.3. flink-yarn still 
reaches Hadoop 2 APIs through reflection 
(ApplicationSubmissionContextReflector, 
RegisterApplicationMasterResponseReflector, ContainerRequestReflector, 
ResourceInformationReflector), and flink-hadoop-fs keeps isMinHadoopVersion(2, 
7) checks. YarnFileStageTestS3ITCase#testRecursiveUploadForYarnS3n can never 
run and YarnTestUtils.isHadoopVersionGreaterThanOrEquals is unused. The docs 
still mention Hadoop < 2.7 for the FileSink and 2.10+ or 3.1+ for GPU 
scheduling. We should remove all of these.



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