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HDFS Proxy is a proxy server through which a hadoop client (through HSFTP) or a standard
HTTPS client (wget, curl, etc) can talk to a hadoop server and more importantly pull data
from the sever. It put an access control layer in front of hadoop namenode server and extends
its functionalities to allow hadoop cross-version data transfer.

HDFSPROXY can be configured/started via either Jetty or Tomcat with different supporting features.

A) With Jetty-based Installation, supporting features include:
> Single Hadoop source cluster data transfer
> Single Hadoop version data transfer
> Authenticate users via user SSL certificates with ProxyFilter installed
> Enforce access control based on configuration files.

B) With Tomcat-based Installation, supporting features include:
> Multiple Hadoop source cluster data transfer
> Multiple Hadoop version data transfer
> Authenticate users via user SSL certificates with ProxyFilter installed
> Authentication and authorization via LDAP with LdapIpDirFilter installed
> Access control based on configuration files if ProxyFilter is installed.
> Access control based on LDAP entries if LdapIpDirFilter is installed.
> Standard HTTPS Get Support for file transfer

The detailed configuration/set-up guide is in the Forrest 
documentation, which can be found at $HADOOP_HDFS_HOME/docs. In order to build the 
documentation on your own from source please use the following command in 
the downloaded source folder:

ant docs -Dforrest.home=path to forrest -Djava5.home= path to jdk5. 

The documentation so built would be under $HADOOP_HDFS_HOME/build/docs