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SequenceFile and MapFile, Checksumming, codecs and Writables
SequenceFile and MapFile are two file formats used in Hadoop to store binary key-value pairs. SequenceFile is optimized for sequential write and read access, while MapFile is optimized for random read access.
Checksumming is a technique used to ensure data integrity during transmission or storage. Hadoop supports various checksum algorithms such as CRC32, Adler32, etc.
Codecs are used to compress and decompress data in Hadoop. Hadoop provides various codecs such as Gzip, Snappy, LZO, etc. Writables are the serialization framework used by Hadoop to convert data into a binary format that can be stored or transmitted. Hadoop provides various types of Writables such as IntWritable, Text, BooleanWritable, etc.
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