February 2019
Beginner to intermediate
544 pages
14h 36m
English
Content preview from Mastering Hadoop 3
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Types of data compression in Hadoop
The Hadoop framework supports many compression formats for both input and output data. A compression format or a coder-decoder (codec) is a set of compiled, ready-to-use Java libraries that a developer can invoke programmatically to perform data compression and decompression in a MapReduce job. Each of these codecs implements an algorithm for compression and decompression and also has different characteristics.
Among the different data compression formats, some are splittable, which can further enhance performance when reading and processing large compressed files. So, when a single large file is stored in HDFS, it is split into many data blocks and distributed across many nodes. If the file has been ...
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