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Where is the output of Mapper written in Hadoop?

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The output of mappers are written on local disk rather than the HDFS Blocks. Because of the following reasons :

There are 2 levels of processing (Map and Reduce) involved to get the final desired outcome.
The result generated by mappers are just intermediate/temporary result which is intern result to the Reducers so writing this would be costly process and inefficient.

The final result (outcome of reducers) is stored on HDFS block.

Follow the link to learn more about Mappers in Hadoop

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