alefischer13 commented on a change in pull request #26624:
URL: https://github.com/apache/spark/pull/26624#discussion_r566484975



##########
File path: docs/configuration.md
##########
@@ -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:
       @gatorsmile were you able to figure this out? My MDC values are not 
propagating in my logs after following this same procedure.




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