link3280 opened a new pull request #7314: [FLINK-11135][YARN] Refactor Hadoop config loading in HadoopUtils URL: https://github.com/apache/flink/pull/7314 ## What is the purpose of the change Currently, Hadoop config search order is: `HADOOP_HOME > HADOOP_CONF_DIR > Flink configuration entries`. However, YARN client prefers `HADOOP_CONF_DIR` to `HADOOP_HOME`, so it would result in inconsistency if the two env variables point to different paths. This PR refactors the Hadoop config loading in HadoopUtils, changing the search order to `HADOOP_CONF_DIR > Flink configuration entries > HADOOP_HOME`, and adds checks for values of overlapping configuration entries from different loading approaches. ## Brief change log - *Refactor the Hadoop configurations loading in HadoopUtils* ## Verifying this change This change added tests and can be verified as follows: - *Added a test to ensure the configuration priority of different loading approaches in HadoopConfigLoadingTest* ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): no - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no - The serializers: no - The runtime per-record code paths (performance sensitive): no - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: yes - The S3 file system connector: no ## Documentation - Does this pull request introduce a new feature? no - If yes, how is the feature documented?
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