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From "Patrick Wendell (JIRA)" <>
Subject [jira] [Resolved] (SPARK-4147) Reduce log4j dependency
Date Mon, 26 Jan 2015 22:24:35 GMT


Patrick Wendell resolved SPARK-4147.
    Resolution: Fixed

> Reduce log4j dependency
> -----------------------
>                 Key: SPARK-4147
>                 URL:
>             Project: Spark
>          Issue Type: Wish
>          Components: Spark Core
>    Affects Versions: 1.1.0, 1.2.0
>            Reporter: Tobias Pfeiffer
>            Assignee: Sean Owen
>             Fix For: 1.3.0, 1.2.1
> spark-core has a hard dependency on log4j, which shouldn't be necessary since slf4j is
used. I tried to exclude slf4j-log4j12 and log4j dependencies in my sbt file.
> Excluding org.slf4j.slf4j-log4j12 works fine if logback is on the classpath. However,
removing the log4j dependency fails because in
a static method of org.apache.log4j.LogManager is accessed *even if* log4j is not in use.
> I guess removing all dependencies on log4j may be a bigger task, but it would be a great
help if the access to LogManager would be done only if log4j use was detected before. (This
is a 2-line change.)

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