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

     [ https://issues.apache.org/jira/browse/SPARK-4147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Patrick Wendell updated SPARK-4147:
-----------------------------------
    Fix Version/s: 1.2.1
                   1.3.0

> Reduce 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, 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 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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