Hi Haoyuan,

Actually hadoop-client is a dummy project, there is no single line of code for this, what it actually do is to depend and link to project "hadoop-core". http://repo1.maven.org/maven2/org/apache/hadoop/hadoop-client/1.2.1/hadoop-client-1.2.1.jar 

I think both are OK, I can change it back to hadoop-client.