Explanation:The shuffle and sort phases occur simultaneously; while map-outputs are being fetched they are merged. 8. Mapper and Reducer implementations can use the ________ to report progress or just indicate that they are alive.
A. Partitioner
B. OutputCollector
C. Reporter
D. All of the mentioned
Answer:A
Explanation:The shuffle and sort phases occur simultaneously; while map-outputs are being fetched they are merged. 8. Mapper and Reducer implementations can use the ________ to report progress or just indicate that they are alive.
A. Partitioner B. OutputCollector C. Reporter D. All of the mentioned
Explanation:Reporter is a facility for MapReduce applications to report progress, set application-level status messages and update Counters. 9. __________ is a generalization of the facility provided by the MapReduce framework to collect data output by the Mapper or the Reducer