[GitHub] [spark] gatorsmile commented on a change in pull request #26624: [SPARK-8981][CORE][test-hadoop3.2][test-java11] Add MDC support in Executor

[GitBox <gi...@apache.org>]

gatorsmile commented on a change in pull request #26624:
URL: https://github.com/apache/spark/pull/26624#discussion_r441303171



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File path: docs/configuration.md
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@@ -2955,6 +2955,12 @@ Spark uses [log4j](http://logging.apache.org/log4j/) for logging. You can config
 `log4j.properties` file in the `conf` directory. One way to start is to copy the existing
 `log4j.properties.template` located there.
 
+By default, Spark adds 1 record to the MDC (Mapped Diagnostic Context): `taskName`, which shows something
+like `task 1.0 in stage 0.0`. You can add `%X{taskName}` to your patternLayout in

Review comment:
       `patternLayout ` -> `PatternLayout `. 
   
   Could you give an example to show how to use it in this document? For example, use an example to show how to specify your application names/identifiers. 
   




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