FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception
hadoop 版本0.20.203.0hbase版本0.90.4
配置HBase，到了最后一步，jps下，发现主节点上HMaster没有启动，在HBase log里有下面异常：
。。。
FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception. Starting shutdown.
java.lang.NoClassDefFoundError: org/apache/commons/configuration/Configuration
。。。
Caused by: java.lang.ClassNotFoundException: org.apache.commons.configuration.Configuration
在网上，有老外如此回答：
Yep, commons-configuration-1.6.jar is shipped in recent hadoop-0.20.203
and not in previous hadoop-0.20.2.
Vamshi, I bet on hadoop throwing a remote exception, with hbase being
unable to read it cause it does not have the commons-configuration jar
(that's what can happen when remote throws exception with non-jdk classes).
Adding the jar in hbase will allow you to better read the cause, but you
will need after to fix your hadoop config.
意思是HBase 的 lib文件夹中缺少commons-configuration。
从hadoop_home/lib下面cp一个commons-configuration-1.6.jar到hbase_home/lib下， 然后就开心了。
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