It is a little more natural to connect to HDFS from apache tomcat. This will allow you to skip the FUSE mounts and just use the HDFS-API.
I have modified this code to run inside tomcat. http://wiki.apache.org/hadoop/HadoopDfsReadWriteExample I will not testify to how well this setup will perform under internet traffic, but it does work. GlusterFS is more like a traditional POSIX filesystem. It supports locking and appends and you can do things like put the mysql data directory on it. GLUSTERFS is geared for storing data to be accessed with low latency. Nodes (Bricks) are normally connected via GIG-E or infiniban. The GlusterFS volume is mounted directly on a unix system. Hadoop is a user space file system. The latency is higher. Nodes are connected by GIG-E. It is closely coupled with MAP/REDUCE. You can use the API or the FUSE module to mount hadoop but that is not a direct goal of hadoop. Hope that helps.
