1. DIS PROPOSAL - Distributed Data Warehouse - R92725032 蔣孟儒 R92725042 龍秋明

2. Outline  Motivation and Goals  System Architecture diagram  Justification  Alternatives  System Requirement  Testing  Timeline  Job distribution

3.  Motivation Solve the problem of data access on multiple computers Support virtual file serving  Goals Provide distributed ftp file sharing Dynamic join and leave of service node Provide corresponding mechanism for server crash.

4. System Architecture and Diagram

5. Description Server side  FTP Server Accept client ’ s request Invoke remote file system API or directly call local file system Return files requested by client through FTP  Remote File System Use RMI to communicate with remote file system of others ’ service node. Join service pool: - Broadcast its own address to all service nodes inside service pool, all nodes, which maintain a server list, update its own server list and construct RMI connection with the new node.

6. Description Client Side  Login the system using common ftp client application  Get a global view of file service pool  Receive file transited by the system (the same as normal ftp client application)

7. Justification  File Location Transparency Provide a file system with global view using J2SE  Failure Handling When service crash, system automatically unmount remote file system and update directory  Scalability Provide service node join or exit our system dynamically

8. Alternatives

9. Alternatives (cont)  FTP server original: Let FTP Server call remote file system of sub-layer, and use sub-layer to handle data transmission other way: Use upper-layer FTP to connect  Service Nodes original: Use broadcast to let service node dynamically join the service pool efficient way: Consider to add a coordinator as a entry point ， and manage all of the service nodes

10. System Requirement and Implementation Requirement  Hardware 4 computers(3 servers and 1 client)  Software Platform: Java VM on Windows or Linux Middleware: Java RMI Implementation  J2SE(JDK1.4)  Borland JBuilder, eclipse

11. Testing  Join & leave testing  Service node failure handling

12. Implementation & Timeline ID 工作名稱開始日期結束日期期間 20032004 十一月十二月一月 1 System analysis 2003/11 /1 2003/11 /8 1W 2System design 2003/11 /9 2003/11 /16 1W 3 System development 2003/11 /17 2003/12 /29 6W 4System testing 2003/12 /30 2004/01 /20 3W

13. Job Distribution  龍秋明： Virtual file system and FTP server daemon  蔣孟儒： Remote file system and service pool management mechanism