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NEW QUESTION: 1
Which process describes the lifecycle of a Mapper?
A. The JobTracker spawns a new Mapper to process all records in a single file.
B. The JobTracker calls the TaskTracker's configure () method, then its map () method and finally its close () method.
C. The TaskTracker spawns a new Mapper to process each key-value pair.
D. The TaskTracker spawns a new Mapper to process all records in a single input split.
Answer: C
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
NEW QUESTION: 2
By default, which Ethernet port is reserved for the services port on an Avaya S8500 Server?
A. Ethernet 3
B. Ethernet 1
C. Ethernet 0
D. Ethernet 2
Answer: B
NEW QUESTION: 3
Which of the following BEST describes the physical location of the data in the database?
A. RAM
B. Table
C. Column
D. HDD
Answer: B