Java Union

1. Languages used in COUCHDB: Erlang features: DB consistency, easy to use license: Apache protocol: http/rest bidirectional data replication, continuous or temporary processing, processing with conflict checking, therefore, The use of Master-master replication (see note 2) mvcc– write without blocking read operation Pre-save version crash-only (reliable) design requires data compression view: Embedded mapping/Reduce formatted view: List display support for server ...

"IT168 Technology" as one of the most representative of large data technology, Hadoop for those who are prepared to explore business impact data is very attractive to IT departments. Hadoop's distributed approach is better suited to dealing with massive unstructured data, but Hadoop and its associated MapReduce programming models are not a panacea, mapreduce and hadoop problems always affect the big ...

January 15, the Institute of Software of the Chinese Academy of Sciences and Shanghai Lian Tong Network Communication Technology Co., Ltd. jointly released the COS operating system. Cos of the advent of a stone stirred the waves, the industry and netizens have raised a lot of questions. Shanghai Lian Tong Company to accept the network of communication channel reporter interview, for questioning to explain. Question one: In the demo video, the COS system part of the interface and Android system "highly similar", how to explain this? Shanghai Lian Tong: cos of the UI will appear in a variety of forms. In fact, COS provides a standard reference design. In the actual use of cos ...

Roundtable Forum: The Nuggets of mobile games and news and technology January 11, 2013, 2013 Global Mobile Games Annual Conference and Channel List Awards ceremony held in Beijing Jing Instrument Hotel. This conference revolves around "move, game, channel, rank" This series of keywords launches the discussion, and with "channel how to make money for the game enterprise?" 　　"As an important issue, we invite industry experts and professionals to discuss further." The forum is chaired by Shanghua Vice president of the Alliance, Houle game President Huang Jian, China Hand Travel Entertainment Group COO Liu Xiachou, Guangyu online Vice President Chen, the CEO King of the World ...

Spark is a cluster computing platform that originated at the University of California, Berkeley Amplab. It is based on memory calculation, from many iterations of batch processing, eclectic data warehouse, flow processing and graph calculation and other computational paradigm, is a rare all-round player. Spark has formally applied to join the Apache incubator, from the "Spark" of the laboratory "" EDM into a large data technology platform for the emergence of the new sharp. This article mainly narrates the design thought of Spark. Spark, as its name shows, is an uncommon "flash" of large data. The specific characteristics are summarized as "light, fast ...

Now almost any application, such as a website, a web app and a mobile app, needs a picture display function, which is very important for the picture function from the bottom up. Must have a forward-looking planning picture server, picture upload and download speed is of crucial importance, of course, this is not to say that it is to engage in a very NB architecture, at least with some scalability and stability. Although all kinds of architecture design, I am here to talk about some of my personal ideas. For the picture server IO is undoubtedly the most serious resource consumption, for web applications need to picture service ...

Spark conversion (transform) and Action (action) list. The following func, most of the time, to make logic clearer, we recommend using anonymous functions! (lambda) "" "Ps:java and Python APIs are the same, names and parameters are unchanged." Transform meaning Map (func) Each INPUT element is exported after a Func function conversion and output an element filter (func) returns the value returned after the Func function evaluates to The input element of true is composed of ...

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 ...

Last year, Premier Wen Jiabao made it clear in the government's work report that "speeding up the development and application of the Internet of things" once again reflects the Government's high emphasis on the developments of Internet of things. With the promotion of national policy, telecom operators are actively involved in the Internet of things, and the internet of Things is an important profit point in the future. 1 IoT architecture and design features of existing EPC middleware the Internet of Things is through radio frequency identification (RFID), infrared sensors, global positioning system, laser scanners and other information sensing equipment, according to the agreed agreement, any items connected to the Internet, exchange of information and communication to achieve intelligent ...

November 18, the Tourism Institute of Beijing United University and IBM jointly created the "big Tourism Data Synergy Innovation Center" was formally founded in Beijing. The center aims at promoting the development of the four categories of academic research, supporting the public Information service of tourism, promoting the upgrading of traditional tourism industry and cultivating the talents of tourism informatization in the field of tourism informatization in China. As the first large-scale tourism data cooperative innovation platform, the center application of IBM's world-leading large-scale data processing and analysis technology, integration of multiple tourism information and resources, facing both domestic and foreign and the industry open to a large information platform to effectively respond to the National Tourism Administration "wisdom Brigade ...