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GIS server cluster based on reliable group communication

Author: YinChaoYang
Tutor: ChenQi
School: Zhejiang University
Course: Computer Applications
Keywords: Geographic Information Systems Server cluster Reliable group communication Load balancing Distributed Cache
CLC: P208
Type: Master's thesis
Year: 2005
Downloads: 122
Quote: 1
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Abstract


This paper first introduces the concept of distributed GIS development status and the challenges currently facing , and then discuss the expansion of the GOS in a distributed the geographical object server of the Artificial Intelligence Laboratory of Zhejiang University , which the the geographic object server cluster GSC architecture. The geographic objects discussed in detail in Chapter server cluster GSC technical problems. The geographic object server cluster GSC with a single system image features , provides a unique GIS service entrance load balancing server , and load the geographic objects the overall operation of the server group state balancing group geographic objects between servers . Distributed cache through cache part of geographic data within the GOS to avoid multiple GOS frequent data access efficiency bottleneck . Distributed lock management mechanism to achieve a synchronized data access between the GOS , write-through and write - invalid data update strategy ensures that the GOS cache consistency . GSC message transfer characteristics analysis and research based on TCP, UDP LAN messaging mechanism , we take full advantage of the Ethernet hardware-level support for IP multicast , design reliable group communication protocols based on IP multicast . The fourth chapter describes the design and implementation of geographic objects server GSC . The GSC includes three main components: geographic object server GOS group , load balancing servers WBS and GSC application development environment . GSC GOS extended the GNet geographical object server , mainly reflected in the network communication module and geographic objects management module . Load balancing server network communication service interface and service scheduling three levels, for the receiver scheduling and forwarding user requests . The GSC application development environment consists of a set of application development interface (API) and a static library . Finally, the article summarizes the technical characteristics of the GSC , pointed out the need for further research in the the geographical object server cluster related issues .

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > General issues > Mapping database and information system
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