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This article is my second time reading Hadoop 0.20.2 notes, encountered many problems in the reading process, and ultimately through a variety of ways to solve most of the. 　　Hadoop the whole system is well designed, the source code is worth learning distributed students read, will be all notes one by one post, hope to facilitate reading Hadoop source code, less detours. 1 serialization core Technology The objectwritable in 0.20.2 version Hadoop supports the following types of data format serialization: Data type examples say ...

PageRank algorithm PageRank algorithm is Google once Shong "leaning against the Sky Sword", The algorithm by Larry Page and http://www.aliyun.com/zixun/aggregation/16959.html "> Sergey Brin invented at Stanford University, the paper download: The PageRank citation ranking:bringing order to the ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall today radish Fish look up information on Wikipedia, 　　   　　It is interesting to see the features of a random article on a wiki, and to summarize the way in which such random articles are implemented in WordPress. Through the random redirection function, to provide readers with an opportunity, ...

With the explosion of information, micro-blogging website Twitter was born. It is no exaggeration to describe Twitter's growth with the word "born". Twitter has grown from 0 to 66,000 since May 2006, when the number of Twitter users rose to 1.5 in December 2007. Another year, December 2008, Twitter's number of users reached 5 million. [1] The success of Twitter is a prerequisite for the ability to provide services to tens of millions of users at the same time and to deliver services faster. [2,3,4 ...

Test Tool YCSB Installation YCSB Introduction: YCSB (Yahoo! Cloud serving Benchmark) is Yahoo Open source of a common performance testing tool. Can be used to test a variety of NoSQL products. Related instructions can refer to https://github.com ...

Pig is a Yahoo donated project to Apache and is currently in the Apache incubator, but the basic functionality is already available. Today I would like to introduce you to this useful pig.pig is Sql-like language, is built on the mapreduce of an advanced query language, Some operations are compiled into the MapReduce model's map and reduce, and users can define their own capabilities. Yahoo Grid Computing department developed another clone of Google's project: Sawzall. Supported operations ...

HBase terms in this article: column-oriented: Row column Group: Column families Column: Column unit: Cell Understanding HBase (an Open-source Google bigtable practical application) The biggest difficulty is what is HBase's data structure concept? First HBase is different from the general relational database, which is a database suitable for unstructured data storage. Another difference is that HBase is based on columns rather than on rows. Goo ...

Config-model is a framework for editing and validating any configuration file or data content. Its configuration mode (data structure representation) provides a tool for user interface and authentication configuration. Optional Graphics (Perl) or curses interfaces can be used to edit configuration data and will be validated against user-supplied patterns. The configuration pattern includes an example of a fstab and a small fstab demo model. Config::model 2.018 This version tracks and makes configuration data display changes. Changes may be due to user edits ...

FP Association Rules Mining Blog categories: Hadoop mapreducehadoop last year, the company 1 Demolition 4, and then demolition 3, in the demolition 25, really 72 move changes, I see the cock silk a burst of dread, but a year later did not affect my colleagues and my work, also did not hear some negative news, Nice, it looks like the level of a big cut. Split 25 ...

"2" three sections of the site's architectural design, the traditional approach is syllogism. The so-called "traditional" is not synonymous with "outdated". Architectural design of large web sites, emphasizing practicality. Trendy design, although attractive, but the technology may be immature, high risk. So, a lot of big websites, walk is the way of the Conservative tradition. When Twitter was online in May 2006, they used ruby-on-rails tools to simplify the development of the site, and Ruby-on-rails's design thought was three paragraphs. 1. The preceding paragraph, namely ...