[HADOOP-6401] Multiple slf4j bindings cause warnings when starting DFS components

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.21.0

Environment

Mac OS X 10.6, Java 6

• Assignee: Unassigned
• Reporter: Sean R. Owen
• Created: 01/Dec/09 12:23
• Updated: 15/Dec/09 19:55
• Resolved: 01/Dec/09 17:04

Description

I'm getting warnings like this when starting jobs with bin/start-dfs.sh in Hadoop Core 0.21.0:

localhost: SLF4J: Class path contains multiple SLF4J bindings.
localhost: SLF4J: Found binding in [jar:file:/Users/srowen/Desktop/hadoop-core-0.21.0/lib/slf4j-log4j12-1.4.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
localhost: SLF4J: Found binding in [jar:file:/Users/srowen/Desktop/hadoop-core-0.21.0/lib/slf4j-simple-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
localhost: SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

Looks like one of the two jars should simply be removed. I removed the older log4j binding.

Issue Links

• relates to: HDFS-831 Multiple slf4j bindings cause warnings in HDFS.