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Thursday, 17 February 2011
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Hadoop I/O: Sequence, Map, Set, Array, BloomMap Files

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Some of Hadoop essential persistent data stuctures explained (SequenceFile, MapFile, etc.):

Apache Hadoop’s SequenceFile provides a persistent data structure for binary key-value pairs. In contrast with other persistent key-value data structures like B-Trees, you can’t seek to a specified key editing, adding or removing it. This file is append-only.

On the topic of persistent data structures, you might also take a look at this comparison of B+trees, LSM trees, and Fractal trees.

Original title and link: Hadoop I/O: Sequence, Map, Set, Array, BloomMap Files (NoSQL databases © myNoSQL)

via: http://www.cloudera.com/blog/2011/01/hadoop-io-sequence-map-set-array-bloommap-files/