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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 ...

Hadoop MapReduce is a programming model for data processing that is simple but powerful enough to be designed for parallel processing of big data.

With the proliferation of data volume, Mysql+memcache has not met the needs of large-scale Internet applications, many organizations have chosen Redis as its architectural complement, however, redis the use of the threshold is not low, such as not supporting SQL, here for everyone to share the Redis use of the full raiders. Redis, one of the most closely watched NoSQL databases, has been used by many well-known internet companies, such as Sina Weibo, Pinterest and Viacom. However, being born with no support for SQL makes him look difficult ...

In our daily life, we are inseparable from the application of position recognition class. Apps like Foursquare and Facebook help us share our current location (or the sights we're visiting) with our family and friends. Apps like Google Local help us find out what services or businesses we need around our current location. So, if we need to find a café that's closest to us, we can get a quick suggestion via Google Local and start right away. This not only greatly facilitates the daily life, ...

There is a concept of an abstract file system in Hadoop that has several different subclass implementations, one of which is the HDFS represented by the Distributedfilesystem class. In the 1.x version of Hadoop, HDFS has a namenode single point of failure, and it is designed for streaming data access to large files and is not suitable for random reads and writes to a large number of small files. This article will explore the use of other storage systems, such as OpenStack Swift object storage, as Ha ...

Want to be the most cow programmer? The following points will help you achieve this goal. Tip 1 to approach instead of memory a programmer friend of mine often tells me how helpful it is to remember that more than 200 C + + functions are available. "I never have to look up the definition of a function, so I can program 50% faster than other programmers." "he said proudly. But what is the result? Didn't he know that the compiler's code completion could save a lot of time finding functions and input functions, and that when C # was released, his efforts on the memory function were in vain. Of course, in programming to function ...

"Gujian Tan" as China's few successful in the market, the original stand-alone, its propaganda did not take the "sell meat" explicit publicity, but let as from the poster out of the official Coser will follow the signing of the sale.　　Today to accept more than the interview is not "Gujian tan" is the recent issue of the drama "Eternal Sword" in the Purple and the sword spirit of the role of red Jade-shun and Omi. Shun and Omi are all red family members of this group, but also a large number of otaku curtilage women a son. As for COS, apply their words is "play happy on the good", as to become professional C ...