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Hadoop's default locality-first scheduling mainly targets map tasks. Why is it NOT useful to schedule reduce...

Hadoop's default locality-first scheduling mainly targets map tasks. Why is it NOT useful to schedule reduce tasks? Explain your answers.

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Hadoop distributed file system-HDFS is the primary storage system of Hadoop. HDFS stores very large files running on a cluster of commodity hardware. It works on the principle of storage of less number of large files rather than the huge number of small files. HDFS stores data reliably even in the case of hardware failure. It also provides high throughput access to the application by accessing in parallel

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