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In mapreduce chaining is the output of reducer again split into blocks before giving to another Mapper?

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In mapreduce chaining is the output of reducer again split into blocks before giving to another Mapper?

New Contributor

In chaining is output file again split, into blocks after reduce phase

map1 => reduce => map2 => output.

If yes then i think we have to add one extra step for safety because then multiple mappers may be running on that file.

map1=> reduce => map2 => reducer2 => output.

Am I right?