sarutak opened a new pull request #26798: [SPARK-30167][REPL] Log4j configuration for REPL can't override the root logger properly. URL: https://github.com/apache/spark/pull/26798 <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://spark.apache.org/contributing.html 2. Ensure you have added or run the appropriate tests for your PR: https://spark.apache.org/developer-tools.html 3. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP][SPARK-XXXX] Your PR title ...'. 4. Be sure to keep the PR description updated to reflect all changes. 5. Please write your PR title to summarize what this PR proposes. 6. If possible, provide a concise example to reproduce the issue for a faster review. --> ### What changes were proposed in this pull request? <!-- Please clarify what changes you are proposing. The purpose of this section is to outline the changes and how this PR fixes the issue. If possible, please consider writing useful notes for better and faster reviews in your PR. See the examples below. 1. If you refactor some codes with changing classes, showing the class hierarchy will help reviewers. 2. If you fix some SQL features, you can provide some references of other DBMSes. 3. If there is design documentation, please add the link. 4. If there is a discussion in the mailing list, please add the link. --> #9816 enabled REPL's log4j configuration to override root logger but #23675 seems to have broken the feature. You can see one example when you modifies the default log4j configuration like as follows. ``` # Change the log level for rootCategory to DEBUG log4j.rootCategory=DEBUG, console ... # The log level for repl.Main remains WARN log4j.logger.org.apache.spark.repl.Main=WARN ``` If you launch REPL with the configuration, INFO level logs appear even though the log level for REPL is WARN. ``` ・・・ 19/12/08 23:31:38 INFO Utils: Successfully started service 'sparkDriver' on port 33083. 19/12/08 23:31:38 INFO SparkEnv: Registering MapOutputTracker 19/12/08 23:31:38 INFO SparkEnv: Registering BlockManagerMaster 19/12/08 23:31:38 INFO BlockManagerMasterEndpoint: Using org.apache.spark.storage.DefaultTopologyMapper for getting topology information 19/12/08 23:31:38 INFO BlockManagerMasterEndpoint: BlockManagerMasterEndpoint up 19/12/08 23:31:38 INFO SparkEnv: Registering BlockManagerMasterHeartbeat ・・・ ``` Before #23675 was applied, those INFO level logs are not shown with the same log4j.properties. ### Why are the changes needed? <!-- Please clarify why the changes are needed. For instance, 1. If you propose a new API, clarify the use case for a new API. 2. If you fix a bug, you can clarify why it is a bug. --> This is a bug breaking a compatibility. ### Does this PR introduce any user-facing change? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If no, write 'No'. --> Yes. The logging behavior for REPL is fixed. ### How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible. If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future. If tests were not added, please describe why they were not added and/or why it was difficult to add. --> Manual test and newly added unit test.
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