Hadoop DP Notes
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What is the difference between a JDK and a JRE ?
JDK, Java Development Kit
is for development purpose and it includes execution environment also. But
JRE
is purely
java run time environment
and hence we will not be able to compile our source files using a JRE.
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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...