Explanation:When percentage of either buffer has filled, their contents will be spilled to disk in the background. 10. ______________ is percentage of memory relative to the maximum heapsize in which map outputs may be retained during the reduce.
A. mapred.job.shuffle.merge.percent
B. mapred.job.reduce.input.buffer.percen
C. mapred.inmem.merge.threshold
D. io.sort.factor
Answer:A
Explanation:When percentage of either buffer has filled, their contents will be spilled to disk in the background. 10. ______________ is percentage of memory relative to the maximum heapsize in which map outputs may be retained during the reduce.
A. mapred.job.shuffle.merge.percent B. mapred.job.reduce.input.buffer.percen C. mapred.inmem.merge.threshold D. io.sort.factor
Explanation:When the reduce begins, map outputs will be merged to disk until those that remain are under the resource limit this defines. Sanfoundry Global Education & Learning Series – Hadoop.