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NEW QUESTION: 1
Refer to the exhibit.

What can a network administrator determine from the output in the exhibit?
A. The switch is using the config file in the primary slot for its startup-config.
B. The switch will boot the primary software on its next boot.
C. The switch booted the primary software on its previous boot.
D. The switch has no software stored in the secondary slot.
Answer: C

NEW QUESTION: 2

A. Option D
B. Option B
C. Option A
D. Option C
E. Option E
Answer: D,E

NEW QUESTION: 3
Which process describes the lifecycle of a Mapper?
A. The TaskTracker spawns a new Mapper to process each key-value pair.
B. The JobTracker spawns a new Mapper to process all records in a single file.
C. The TaskTracker spawns a new Mapper to process all records in a single input split.
D. The JobTracker calls the TaskTracker's configure () method, then its map () method and finally its close () method.
Answer: A
Explanation:
For each map instance that runs, the TaskTracker creates a new instance of your mapper.
Note:
*The Mapper is responsible for processing Key/Value pairs obtained from the InputFormat. The
mapper may perform a number of Extraction and Transformation functions on the Key/Value pair
before ultimately outputting none, one or many Key/Value pairs of the same, or different Key/Value
type.
*With the new Hadoop API, mappers extend the org.apache.hadoop.mapreduce.Mapper class.
This class defines an 'Identity' map function by default - every input Key/Value pair obtained from
the InputFormat is written out.
Examining the run() method, we can see the lifecycle of the mapper:
/**
*Expert users can override this method for more complete control over the
*execution of the Mapper.
*@param context
*@throws IOException
*/
public void run(Context context) throws IOException, InterruptedException {
setup(context);
while (context.nextKeyValue()) {
map(context.getCurrentKey(), context.getCurrentValue(), context);
}
cleanup(context);
}
setup(Context) - Perform any setup for the mapper. The default implementation is a no-op method.
map(Key, Value, Context) - Perform a map operation in the given Key / Value pair. The default
implementation calls Context.write(Key, Value)
cleanup(Context) - Perform any cleanup for the mapper. The default implementation is a no-op
method.
Reference: Hadoop/MapReduce/Mapper