February 2019
Beginner to intermediate
544 pages
14h 36m
English
Content preview from Mastering Hadoop 3
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Schema evolution
Schema evoluation refers to changes in the schema of underlying data over some intervals of time. The schema stores the detail of each attribute and its type. Unless we are confident that the schema is guaranteed to never change, we will need to consider schema evolution, or how the schema of data changes over time. How will specific file formats handle the fields that are added, modified, or deleted?
One of the important design considerations when selecting a file format for data is how it manages schema evolution.
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