Hadoop DP Notes
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What is data serialization ?
Serialization is the process of
converting object data into byte stream data
for transmission
over a network across different nodes in a cluster
or for
persistent
data storage
.
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What are the main components of Mapreduce Job ?
Main driver class which provides job configuration parameters. Mapper class which must extend org.apache.hadoop.mapredu...
TO_CHAR
This will be used to extract various date formats. The available date formats as follows. Syntax: to_char ( date , fo...