Workflows expressed in Oozie can contain:

• A. Iterntive repetition of MapReduce jobs until a desired answer or state is reached.
• B. Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with
  exception handlers but no forks.
• C. Sequences of MapReduce and Pig. These sequences can be combined with other actions including
  forks, decision points, and path joins.
• D. Sequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can
  be combined with forks and path joins.

Which describes how a client reads a file from HDFS?

• 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 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.
• D. 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.

Which best describes how TextInputFormat processes input files and line breaks?

• A. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the
  split that contains the end of the broken line.
• B. The input file is split exactly at the line breaks, so each RecordReader will read a series of complete
  lines.
• C. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of
  both splits containing the broken line.
• D. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the
  split that contains the beginning of the broken line.
• E. Input file splits may cross line breaks. A line that crosses file splits is ignored.

In a MapReduce job with 500 map tasks, how many map task attempts will there be?

• A. At least 500.
• B. At most 500.
• C. Exactly 500.
• D. It depends on the number of reduces in the job.
• E. Between 500 and 1000.

Which HDFS command uploads a local file X into an existing HDFS directory Y?

• A. hadoop scp X Y
• B. hadoop fs-put X Y
• C. hadoop fs -get X Y
• D. hadoop fs -localPut X Y