GJL opened a new pull request #7164: [FLINK-10992][tests] Revise Hadoop configuration. URL: https://github.com/apache/flink/pull/7164 ## What is the purpose of the change Revise Hadoop configuration to improve HDFS stability in tests. ## Brief change log - *Do not use /tmp directory to place log files or the HDFS data directory.* - *Reconfigure dfs.replication to 1 because file availability is irrelevant in tests.* - *Increase heap size of HDFS DataNodes and NameNode.* - *Change find-files! function to not fail if directory does not exist.* ## Verifying this change This change is already covered by existing tests, such as *Jepsen tests*. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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