Raster data access method based on distributed multi-stage cache system

A caching system and raster data technology, applied in memory systems, transmission systems, electrical digital data processing, etc., can solve the problem of low data storage performance, improve transmission rate, efficient data access efficiency, and increase the number of concurrent processing Effect

Inactive Publication Date: 2013-06-19
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the shortcomings of low data storage performance in the prior art, the present invention provides a novel raster data access method based on a distributed multi-level cache system for small-block spatial data

Method used

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  • Raster data access method based on distributed multi-stage cache system
  • Raster data access method based on distributed multi-stage cache system
  • Raster data access method based on distributed multi-stage cache system

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Embodiment 1

[0028] A raster data access method based on a distributed multi-level cache system, the distributed system used is such as figure 1 , 2 As shown, the distributed system is physically divided into three layers, including server-side data storage system 1, server-side cache system 2, and client 3. The bottom layer is server-side data storage system 1, server-side cache system 2, and the bottom layer is The upper layer is the client layer 3 that interacts with users. The server-side data storage system 1 here is a distributed storage cluster composed of multiple data storage servers. The data storage server is a data storage server based on the HBase database. The server-side cache system 2 is a distributed cache cluster composed of multiple cache servers, and the cache servers are servers based on the Redis database. The distributed system is logically divided into four layers. The bottom layer is the physical layer of data storage, that is, the server-side data storage system ...

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Abstract

The invention relates to raster data access, in particular to access of a small piece of spatial raster data and discloses a raster data access method based on a distributed multi-stage cache system. According to the raster data access method, a server data storage system, a server cache system and a client are involved, and the client comprises a client cache and a user interface. The raster data access method comprises the following steps that: the user interface receives a raster data request sent by a user, and whether required data exist in the client cache is judged; the server client cache system judges whether data required by the raster data request exist in the server cache system; and the server data storage system returns the data required by the raster data request; and the client cache is updated, and the returned data are stored in the client cache system. The method has the advantages that the spatial raster data storage and cache performance are improved; the reliability and availability are high; and data are optimized and accessed, so that the data request can be responded efficiently.

Description

technical field [0001] The invention relates to grid data access, especially the access to small space grid data, and discloses a grid data access method based on a distributed multi-level cache system. Background technique [0002] Raster data is array data arranged in rows and columns of grid cells with different gray scales or colors. The grid structure is an array of pixels (grid units) with equal size, uniform distribution and close connection to represent the data organization of spatial object or phenomenon distribution. It is the simplest and most intuitive spatial data structure, which divides the earth's surface into a large, uniform, and closely adjacent grid array. The position of each unit (pixel) is defined by its row and column number, and the position of the entity represented is implied in the row and column position of the grid. Each data in the data organization represents the non-geometric attribute of the object or phenomenon or points to its attribute ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08G06F12/08G06F17/30G06F12/0811G06F12/0813
Inventor 陈华钧高啸柳云超胡磊郑国轴吴朝晖
Owner ZHEJIANG UNIV
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