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[SPARK-42157][CORE]
spark.scheduler.mode=FAIR
should provide FAIR s…
…cheduler ### What changes were proposed in this pull request? Like our documentation, `spark.sheduler.mode=FAIR` should provide a `FAIR Scheduling Within an Application`. https://spark.apache.org/docs/latest/job-scheduling.html#scheduling-within-an-application ![Screenshot 2023-01-22 at 2 59 22 PM](https://user-images.githubusercontent.com/9700541/213944956-931e3a3c-d094-4455-8990-233c7966194b.png) This bug is hidden in our CI because we have `fairscheduler.xml` always as one of test resources. - https://github.com/apache/spark/blob/master/core/src/test/resources/fairscheduler.xml ### Why are the changes needed? Currently, when `spark.scheduler.mode=FAIR` is given without scheduler allocation file, Spark creates `Fair Scheduler Pools` with `FIFO` scheduler which is wrong. We need to switch the mode to `FAIR` from `FIFO`. **BEFORE** ``` $ bin/spark-shell -c spark.scheduler.mode=FAIR Setting default log level to "WARN". To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel). 23/01/22 14:47:37 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 23/01/22 14:47:38 WARN FairSchedulableBuilder: Fair Scheduler configuration file not found so jobs will be scheduled in FIFO order. To use fair scheduling, configure pools in fairscheduler.xml or set spark.scheduler.allocation.file to a file that contains the configuration. Spark context Web UI available at http://localhost:4040 ``` ![Screenshot 2023-01-22 at 2 50 38 PM](https://user-images.githubusercontent.com/9700541/213944555-6e367a33-ca58-4daf-9ba4-b0319fbe4516.png) **AFTER** ``` $ bin/spark-shell -c spark.scheduler.mode=FAIR Setting default log level to "WARN". To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel). 23/01/22 14:48:18 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Spark context Web UI available at http://localhost:4040 ``` ![Screenshot 2023-01-22 at 2 50 14 PM](https://user-images.githubusercontent.com/9700541/213944551-660aa298-638b-450c-ad61-db9e42a624b0.png) ### Does this PR introduce _any_ user-facing change? Yes, but this is a bug fix to match with Apache Spark official documentation. ### How was this patch tested? Pass the CIs. Closes #39703 from dongjoon-hyun/SPARK-42157. Authored-by: Dongjoon Hyun <dongjoon@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> (cherry picked from commit 4d51bfa) Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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