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https://issues.apache.org/jira/browse/HDFS-3136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13237114#comment-13237114
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Scott Carey commented on HDFS-3136:
-----------------------------------
It appears that in the old case, the problem is that slf4j-log4j12 was
specified wrong. It should always be specified as <optional>true</optional> or
baring that, <scope>provided</scope> is acceptable but can lead to some
multiple binding errors during unit tests (but not deployment).
It appears that it is not needed at all however -- is this because all of
Hadoop is moving away from SLF4J?
> Multiple SLF4J binding warning
> ------------------------------
>
> Key: HDFS-3136
> URL: https://issues.apache.org/jira/browse/HDFS-3136
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: build
> Affects Versions: 0.23.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Attachments: HDFS-3136.patch
>
>
> This is the HDFS portion of HADOOP-8005. HDFS no longer depends upon slf4j,
> so removing it from the assembly will eliminate the HDFS-portion of the
> multiple SLF4J warnings.
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