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From Bruno Mahé (JIRA) <>
Subject [jira] [Commented] (BIGTOP-583) "Class path contains multiple SLF4J bindings" warnings
Date Wed, 23 May 2012 23:15:40 GMT


Bruno Mahé commented on BIGTOP-583:

> "Class path contains multiple SLF4J bindings" warnings
> ------------------------------------------------------
>                 Key: BIGTOP-583
>                 URL:
>             Project: Bigtop
>          Issue Type: Bug
>          Components: General
>    Affects Versions: 0.4.0
>            Reporter: Roman Shaposhnik
>            Assignee: Roman Shaposhnik
>             Fix For: 0.4.0
>         Attachments: BIGTOP-583.patch.txt
> The following components depend on hadoop-common (package hadoop) and thus get slf4j
JARs twice on their classpath (once as a second-level dependency of hadoop-common and second
time from their own lib):
>   # hadoop-hdfs
>   # hadoop-mapreduce
>   # hadoop-yarn
>   # hbase
>   # hive
>   # mahout
>   # flume
> This leads to the harmless, but very annoying "Class path contains multiple SLF4J bindings"
warning message to pop up.
> Now, this is not a new problem for us -- unfortunately we tend to have multiple instances
of the same JARs in the Bigtop's classpath quite a bit. As such one way of "fixing" it would
be just making slf4j shut up. The other alternative is to remove slf4j jar files from all
the packages mentioned above. This is pretty good, expect for an off chance that *somehow*
the component could be used in a standalone mode
> where it can't really find hadoop. Not sure how important such a use case would be.
> Thoughts?

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