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This article was translated by Wang Xiuli Jiangnan University Graduate School of Design, authors: Sabina Idler, only to see the original learning, declined to reprint. In recent years we have carefully studied child-centered design. The main reason for the study is to create awareness for the target group of children's designers. Adult designers are not able to design games, web pages, and applications for kids without the participation of targeted age groups. Of course, the experience of adults is complicated, and we always go to add some colors and dolls, while simplifying the interaction process, but these do not make it ...

After more than eight years of practice, from Taobao's collection business to today to support all of Alipay's core business, and in the annual "Double Eleven Singles Day" continue to create a world record for the transaction database peak processing capacity.

Sub-bar: We summarize the last six months used in the user research (test) method, I remember the cable on the user research, competitive analysis of what ... Prothink: User interview, questionnaire survey, user model. Sub-bar: User interviews, questionnaires, usability testing, card classification, Story edition, data research, user model. User model has not been updated to use. We've done a lot of work on this. Lio: I think we need to explore how to use the user model. Fish Pattern Hui: Questionnaire _ Site (10 people), Questionnaire _ Network (1 ...

Refer to Hadoop_hdfs system dual-machine hot standby scheme. PDF, after the test has been added to the two-machine hot backup scheme for Hadoopnamenode 1, foreword currently hadoop-0.20.2 does not provide a backup of name node, just provides a secondary node, although it is somewhat able to guarantee a backup of name node, when the machine where name node resides ...

When we use a server to provide data services on the production line, I encounter two problems as follows: 1) One server does not perform enough to provide enough capacity to serve all network requests. 2) We are always afraid of this server downtime, resulting in service unavailable or data loss. So we had to expand our server, add more machines to share performance issues, and solve single point of failure problems. Often, we extend our data services in two ways: 1) Partitioning data: putting data in separate pieces ...

The traditional relational database has good performance and stability, at the same time, the historical test, many excellent database precipitation, such as MySQL. However, with the explosive growth of data volume and the increasing number of data types, many traditional relational database extensions have erupted. NoSQL database has emerged. However, different from the previous use of many NoSQL have their own limitations, which also led to the difficult entry. Here we share with you Shanghai Yan Technology and Technology Director Yan Lan Bowen - how to build efficient MongoDB cluster ...

This paper mainly introduces the ISAS5710 system for Data mart and ODS application, and takes ISAS5710 Medium system as an example, it focuses on how to install and configure the ISAS5710 system, how to design and deploy the database of User data mart and relevant analysis and application, To help you quickly learn the basics of using ISAS5710 Rapid Deployment Data mart applications. With the continuous improvement of user's business system and the increasingly fierce market competition, more and more enterprises are building data Warehouse, Data mart ...

"Editor's note" Recently, Anshu and Rajkumar, from Aerospike, posted an article on the high Scalability website claiming that it could obtain the million TPS at a cost of USD 1.68 per hour, which was affected by Redis Labs's Itamar Haber Using a non-benchmark program, it seems to the author that the benchmark is a trap, so what about the Redis test results? The following is the original: one day ago, I saw from Aerospike ...

This paper is an excerpt from the book "The Authoritative Guide to Hadoop", published by Tsinghua University Press, which is the author of Tom White, the School of Data Science and engineering, East China Normal University. This book begins with the origins of Hadoop, and integrates theory and practice to introduce Hadoop as an ideal tool for high-performance processing of massive datasets. The book consists of 16 chapters, 3 appendices, covering topics including: Haddoop;mapreduce;hadoop Distributed file system; Hadoop I/O, MapReduce application Open ...

Red Hat http://www.aliyun.com/zixun/aggregation/17539.html "> Company announced the acquisition of Gluster, The latter is widely concerned as a developer of Glusterfs open source file system and Gluster storage platform software stack. In this way, Red Hat has created itself as a service provider for customers looking for large data solutions like Apache Hadoop.