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Hadoop >> mail # user >> is implementing WritableComparable and setting Job.setSortComparatorClass(...) redundant?


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is implementing WritableComparable and setting Job.setSortComparatorClass(...) redundant?
quick question:

i have a key that already implements WritableComparable. this will be the
intermediary key passed from the map to the reducer.

is it necessary to extend RawComparator and set it on
Job.setSortComparatorClass(Class<? extends RawComparator> cls) ?