Question

Question No. 3
In Map-Reduce programming, what are map files and why are they important
O Map files are the files that show how the data is distributed in the
Hadoop clusterMap files are the files that show how the data is distributed in the
Hadoop cluster
O Map files are sorted sequence files that also have an index. The
index allows fast data look up. Map files are sorted sequence files that also have an index. The
index allows fast data look up.
Map files are generated by Map-reduce after reduce step. They
show the task distribution during job execution Map files are generated by Map-reduce after reduce step. They
show the task distribution during job execution
O Map files are stored on the namenode and capture the metadata
for all blocks on a particular rack. This is how Hadoop is "rack
aware"Map files are stored on the namenode and capture the metadata
for all blocks on a particular rack. This is how Hadoop is "rack
aware"​

Answer 1

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