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From "Roman Shaposhnik (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5858) When HBase gets executed against Hadoop 2.X "SLF4j:CLASSPATH contains multiple SLF4j binding" warning is displayed
Date Mon, 23 Apr 2012 15:37:35 GMT
Roman Shaposhnik created HBASE-5858:
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             Summary: When HBase gets executed against Hadoop 2.X "SLF4j:CLASSPATH contains
multiple SLF4j binding" warning is displayed
                 Key: HBASE-5858
                 URL: https://issues.apache.org/jira/browse/HBASE-5858
             Project: HBase
          Issue Type: Bug
          Components: scripts
    Affects Versions: 0.92.1, 0.92.0
            Reporter: Roman Shaposhnik
            Assignee: Roman Shaposhnik
            Priority: Minor


Since HBase tries to find locations of the Hadoop jars from the environment in certain cases
it ends up with extra SLF4j jars coming from Hadoop classpath. When that happens "SLF4j:CLASSPATH
contains multiple SLF4j binding" warning gets displayed.

The good news here is that the warning is just that -- a warning. The bad news is that it
seems this issue will be tricky to fix properly. On one hand we would like Hadoop itself to
give us transitive closure of the set of jar files required (computing that in the HBase script
is a maintenance nightmare). On the other hand that set of jar files could contain some of
the very same jars shipped with HBase.

This problem existed for quiet some time. SLF4j is just the first component to complain.

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