空间信息网格中的复制技术

Replication in Spatial Information Grid

空间信息网格项目数据量大,用户遍及各地,对数据文件的请求延时大、占大量带宽。复制可以节省带宽、减少时延、均衡负载、改善系统可靠性。采用动态复制技术可以使用户有效地获得所需的数据。本文详细地论述了动态复制策略以及空间信息网格中的复制管理机制、复制服务流程和具体实施。

Spatial information grid generates large amounts of data need to be able to share with users around the world. Request for a file, large amounts of bandwidth could be consumed to transfer the file from the server to the client. Furthermore the latency involved could be significant considering the size of the files involved. Replication is to reduce access latency and bandwidth consumption and help in load balancing and improve reliability by creating multiple copies of the same data. Static replication cannot adapt to changes in user behavior. For user's need we needs dynamic replication strategies, where replica creation, deletion and management are done automatically. Dynamic strategies have the ability to adapt to changes in user behavior. This article discusses detailedly dynamic replication strategies, replica management machanism.replica service process and implemented.