Which is faster: Map-side join or Reduce-side join? Why?
A. Both techniques have about the the same performance expectations.
B. Reduce-side join because join operation is done on HDFS.
C. Map-side join is faster because join operation is done in memory.
D. Reduce-side join because it is executed on a the namenode which will have faster CPU and more memory.
Answer:C
Which is faster: Map-side join or Reduce-side join? Why?
A. Both techniques have about the the same performance expectations. B. Reduce-side join because join operation is done on HDFS. C. Map-side join is faster because join operation is done in memory. D. Reduce-side join because it is executed on a the namenode which will have faster CPU and more memory.