Hadoop DP Notes
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What are constant variable in Java ?
The variables declared as
static
and
final
are constant variables. So only one copy of the variable exists for all instances of the class and the value can’t be changed also.
Example:
static final int PI = 2.14;
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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...