Hadoop Pipes
Hadoop Pipes – Hadoop interface name MapReduce C++ language for . Display and convolution code with information exchange for standard access and from exit from the Streaming technology used different as ¬, Pipes sockets conductor as uses _ this through task observer ¬C ++ map or shorten function to work that lowers process with is connected . JNI is not used .
Come on , the temperature re the example in C++ we write and after using it Pipes how to use seeing we go out Listing 2-12 ¬ map and folding functions source for C++ the code shows .
Control questions :
1. To networks to be placed main requirements how ?
2. Network productivity what _
3. How features network to work effect does ?
4. Network the work activities to improve how methods is there
5. High speed traffic redirect how provide can _
6. Network reliability how provided ?
PRACTICAL EXERCISE UNIT- 9
Topic : HDFS main concepts
Work target : HDFS block concepts study _
Blocks
Disk drive with connected block the size of this reading or to write in operations used minimum amount of data . One disc file systems of the data disk block to size a lot has been in blocks repetition through from this uses _ File system of the block volume usually one how many kilobytes organize does , of the disk block volume while usually 512 bytes organize does _ To the rule according to this of nuances all of them file systems users for absolutely transparent , they are just to files arbitrariness in length information they read or they write However , the file system providers ( eg df _ and fsck ) file system block level works _
_ block in HDFS There is also a concept , but it is significant level bigger to volume has - default on , 64 MB. Single disc file in systems that it was like , HDFS files from each other independent respectively stored block into pieces is divided . One disc file from systems different like , one from the block smaller HDFS file that is block for separated whole place does not occupy If ¬ in the text different not specified if , this The term " block " in the book refers to HDFS blocks hint does _
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