A. Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted
values.

B. The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce
job.

C. The values are in sorted order.

D. The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the
same ordering.

A. Sqoop

B. Hadoop Streaming

C. mapred

D. Oozie

E. Flume

A. The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode
that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then
from the NameNode to the client.

B. The client queries the NameNode for the block location(s). The NameNode returns the block location(s)
to the client. The client reads the data directory off the DataNode(s).

C. The client contacts the NameNode for the block location(s). The NameNode then queries the
DataNodes for block locations. The DataNodes respond to the NameNode, and the NameNode redirects
the client to the DataNode that holds the requested data block(s). The client then reads the data directly
off the DataNode.

D. The client queries all DataNodes in parallel. The DataNode that contains the requested data responds
directly to the client. The client reads the data directly off the DataNode.

A. The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers

B. The default Hash Partitioner sends key value pairs with the same key to the same Reducer

C. The reduce method is invoked once for each unique value

D. The Mapper must sort its output of (key.value) pairs in descending order based on value

A. mapreduce

B. pig

C. mrunit

D. hive

A. The SORT BY command causes only one reducer to be used

B. Each reducer generates a file sorted by age

C. The output of each reducer is only the age column

D. The output is guaranteed to be a single file with all the data sorted by age

A. ApplicationMasterService

B. TaskTracker

C. ApplicationMaster

D. ResourceManager

E. JobTracker

F. NodeManager