hbase multiple SLF4J&n…

hbase multiple SLF4J bindings 警告

hbase shell 和命令操作中经常有个烦人的警告，说SLF4J有多个绑定：

hbase(main):003:0> list
TABLE
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/zhouhh/hbase-0.94.0/lib/slf4j-log4j12-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/zhouhh/hadoop-1.0.3/lib/slf4j-log4j12-1.4.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
t1
1 row(s) in 0.4300 seconds

查看一下classpath，果然，hadoop和hbase各有一个jar文件：

[zhouhh@Hadoop48 test]$ hbase classpath | tr ":" "\n" | grep -i slf4j
/home/zhouhh/hbase-0.94.0/lib/slf4j-api-1.5.8.jar
/home/zhouhh/hbase-0.94.0/lib/slf4j-log4j12-1.5.8.jar
/home/zhouhh/hadoop-1.0.3/libexec/../lib/slf4j-api-1.4.3.jar
/home/zhouhh/hadoop-1.0.3/libexec/../lib/slf4j-log4j12-1.4.3.jar

解决办法，将一个hbase lib下的jar移除,警告消除。(不能将hadoop lib下的jar文件移除，否则调用shell 脚本start-all.sh远程启动hadoop时会报找不到log4j包的错误。)

[zhouhh@Hadoop48 test]$ cd /home/zhouhh/hbase-0.94.0/lib/
 [zhouhh@Hadoop48 lib]$ mv slf4j-log4j12-1.5.8.jar ../.

hbase(main):001:0> list
TABLE
t1
1 row(s) in 0.4300 seconds

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