Cloudera
CCD-333 · Question #23
Combiners Increase the efficiency of a MapReduce program because:
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HBase Performance Tuning
Question
Combiners Increase the efficiency of a MapReduce program because:
Options
- AThey provide a mechanism for different mappers to communicate with each Other, thereby
- BThey provide an optimization and reduce the total number of computations that are needed to
- CThey aggregate intermediate map output locally on each individual machine and therefore
- DThey aggregate intermediate map output horn a small number of nearby (i.e., rack-local)
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Topics
#combiners#MapReduce optimization#local aggregation#intermediate output