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NEW QUESTION: 1
You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses TextInputFormat: the mapper applies a regular expression over input values and emits key-values pairs with the key consisting of the matching text, and the value containing the filename and byte offset. Determine the difference between setting the number of reduces to one and settings the number of reducers to zero.
A. There is no difference in output between the two settings.
B. With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With one reducer, instances of matching patterns are stored in multiple files on HDFS.
C. With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of matching patterns are stored in a single file on HDFS.
D. With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one reducer, all instances of matching patterns are gathered together in one file on HDFS.
Answer: D
Explanation:
* It is legal to set the number of reduce-tasks to zero if no reduction is desired.
In this case the outputs of the map-tasks go directly to the FileSystem, into the output path set by setOutputPath(Path). The framework does not sort the map-outputs before writing them out to the FileSystem.
* Often, you may want to process input data using a map function only. To do this, simply set mapreduce.job.reduces to zero. The MapReduce framework will not create any reducer tasks. Rather, the outputs of the mapper tasks will be the final output of the job.
Note:
Reduce
In this phase the reduce(WritableComparable, Iterator, OutputCollector, Reporter) method
is called for each <key, (list of values)> pair in the grouped inputs.
The output of the reduce task is typically written to the FileSystem via
OutputCollector.collect(WritableComparable, Writable).
Applications can use the Reporter to report progress, set application-level status messages
and update Counters, or just indicate that they are alive.
The output of the Reducer is not sorted.
NEW QUESTION: 2
Impediments are a part of any project. Which of the following is NOT true about impediments in Scrum?
A. Impediments can be both internal and external.
B. They reduce the productivity of a Scrum team.
C. Impediments faced are brought up by the Scrum Team during the Daily Standup Meeting.
D. Impediments should be documented only by the team members in the Impediment Log.
Answer: A
Explanation:
Reference:
https://study.com/academy/lesson/impediments-in-scrum-project-management.html
NEW QUESTION: 3
What are the advantages of clearly and correctly defining requirements at the start of a project? (Select two.)
A. Improves the automated test performance
B. Sets clear expectations with stakeholders
C. Cuts unnecessary expenditures
D. Eases the association between test sets and cycles
E. Is required to integrate with external tools
Answer: B,C