hadoop custom recordreader example

Merging Small Files into SequenceFile 7

In this post, we will discuss one of the famous use case of SequenceFiles, where we will merge large number of small files into SequenceFile. We will get to this requirement mainly due to the lack efficient processing of large number of small files in hadoop or mapreduce. Need For Merging Small Files: As hadoop stores all the HDFS files metadata in namenode’s main memory(which is a limited value) for […]

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I am a plsql developer. Intrested to move into bigdata.

Neetika Singh ITA