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[SPARK-42880][DOCS] Update running-on-yarn.md to log4j2 syntax #40504

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[SPARK-42880][DOCS] Update running-on-yarn.md to log4j2 syntax #40504

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[SPARK-42880] Update running-on-yarn.md for log4j2
frankliee Mar 21, 2023
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frankliee Mar 22, 2023
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2 changes: 1 addition & 1 deletion docs/running-on-yarn.md
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Expand Up @@ -137,7 +137,7 @@ Note that for the first option, both executors and the application master will s
log4j configuration, which may cause issues when they run on the same node (e.g. trying to write
to the same log file).

If you need a reference to the proper location to put log files in the YARN so that YARN can properly display and aggregate them, use `spark.yarn.app.container.log.dir` in your `log4j.properties`. For example, `log4j.appender.file_appender.File=${spark.yarn.app.container.log.dir}/spark.log`. For streaming applications, configuring `RollingFileAppender` and setting file location to YARN's log directory will avoid disk overflow caused by large log files, and logs can be accessed using YARN's log utility.
If you need a reference to the proper location to put log files in the YARN so that YARN can properly display and aggregate them, use `spark.yarn.app.container.log.dir` in your `log4j2.properties`. For example, `appender.file_appender.fileName=${sys:spark.yarn.app.container.log.dir}/spark.log`. For streaming applications, configuring `RollingFileAppender` and setting file location to YARN's log directory will avoid disk overflow caused by large log files, and logs can be accessed using YARN's log utility.

To use a custom metrics.properties for the application master and executors, update the `$SPARK_CONF_DIR/metrics.properties` file. It will automatically be uploaded with other configurations, so you don't need to specify it manually with `--files`.

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