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From "Tobias Pfeiffer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-4147) Remove log4j dependency
Date Thu, 30 Oct 2014 01:55:33 GMT
Tobias Pfeiffer created SPARK-4147:
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             Summary: Remove log4j dependency
                 Key: SPARK-4147
                 URL: https://issues.apache.org/jira/browse/SPARK-4147
             Project: Spark
          Issue Type: Wish
          Components: Spark Core
    Affects Versions: 1.1.0
            Reporter: Tobias Pfeiffer


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 https://github.com/apache/spark/blob/v1.1.0/core/src/main/scala/org/apache/spark/Logging.scala#L121
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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