Github user liorchaga commented on the pull request:
https://github.com/apache/spark/pull/4998#issuecomment-80979001
log4j12-api bridge is working properly.
Our executor code is using log4j 1.2.7, and this jar is included in the
jars provided to sparkContext. The spark distribution itself is shipped with
dependency in log4j12-api (instead of log4j12). The executor logging is
delegated to log4j 2.x successfully.
As for the configuration - the syntax is not backwards compatible. Even the
configuration property is changed (log4j.configuration for 1.2 vs.
log4jConfigurationFile for 2.x).
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