|本期目录/Table of Contents|

[1]刘黎志,张 威.消除规范关系连接冗余的二次排序算法研究[J].武汉工程大学学报,2017,39(05):508-513.[doi:10. 3969/j. issn. 1674?2869. 2017. 05. 018]
 LIU Lizhi,ZHANG Wei.Secondary Sort-Based Algorithm for Eliminating Normative Join Redundancy[J].Journal of Wuhan Institute of Technology,2017,39(05):508-513.[doi:10. 3969/j. issn. 1674?2869. 2017. 05. 018]
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《武汉工程大学学报》[ISSN:1674-2869/CN:42-1779/TQ]

卷:
39
期数:
2017年05期
页码:
508-513
栏目:
机电与信息工程
出版日期:
2017-12-19

文章信息/Info

Title:
Secondary Sort-Based Algorithm for Eliminating Normative Join Redundancy
文章编号:
20170518
作者:
刘黎志12张 威12
1. 智能机器人湖北省重点实验室(武汉工程大学),湖北 武汉 430205; 2. 武汉工程大学计算机科学与工程学院,湖北 武汉 430205
Author(s):
LIU Lizhi12 ZHANG Wei12
1. Hubei Key Laboratory of Intelligent Robot (Wuhan Institute of Technology), Wuhan 430205, China; 2. School of Computer Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China
关键词:
MapReduce连接冗余二次排序HBase
Keywords:
MapReduce join redundancy secondary sort Hbase
分类号:
TP311
DOI:
10. 3969/j. issn. 1674?2869. 2017. 05. 018
文献标志码:
A
摘要:
使用MapReduce框架对规范的一对多关系实体进行连接操作时,一方实体的各个属性会在连接的结果中产生大量冗余. 通过对二次排序算法进行优化,重新定义Map阶段的分区过程、Shuffle阶段的排序及分组过程,使得Map阶段的输出为包含一方实体属性值和多方实体排序值的组合键及包含多方实体属性值的集合. Reduce阶段将组合键进行分解,提取一方实体的主码作为HBase表的行健,并将组合键中一方实体的各个属性值及多方实体属性值集合分别写入HBase表中对应的列,从而既实现了连接的语义,又消除了冗余. 实验证明,优化后的算法可以消除一方实体属性值在连接结果中的冗余,提高了对连接结果的查询效率.
Abstract:
The join results of two entities with normative one-to-many relationship by MapReduce may contain some redundancy of one side entity. A combination key with one side entity properties and multi-side sorted values and a list of multi-side entity properties can be got as the input of reduce stage, by optimizing secondary sort-based algorithm and redefining the partition function of map stage, sort and group function of shuffle stage. After splitting the combination key at reduce stage, the key of one side entity was extracted as rowkey of the HBase table to store the join results, and the other properties of the one side entity and the list containing multi- side entity properties were put in the corresponding columns of the HBase table, so the join semantics was realized and the redundancy was eliminated. The examination proves that the optimized algorithm can eliminate the redundancy of one side entity properties and promote the data query efficiency of the join results.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-12-01 作者简介:刘黎志, 硕士, 副教授. E-mail:llz73@163.com
更新日期/Last Update: 2017-10-26