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From "Roman Shaposhnik (JIRA)" <>
Subject [jira] [Created] (BIGTOP-583) "Class path contains multiple SLF4J bindings" warnings
Date Mon, 14 May 2012 16:53:53 GMT
Roman Shaposhnik created BIGTOP-583:

             Summary: "Class path contains multiple SLF4J bindings" warnings
                 Key: BIGTOP-583
             Project: Bigtop
          Issue Type: Bug
          Components: General
    Affects Versions: 0.4.0
            Reporter: Roman Shaposhnik
            Assignee: Roman Shaposhnik
             Fix For: 0.4.0

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.


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