Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer APACHE-HADOOP-DEVELOPER Dumps in PDF

Free Hortonworks APACHE-HADOOP-DEVELOPER Real Questions (page: 7)

What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

  1. Make a directory /foo/bar
  2. Read a file /foo/bar
  3. List a directory /foo
  4. Delete a directory /foo/bar

Answer(s): B



In Hadoop 2.0, which TWO of the following processes work together to provide automatic failover of the NameNode? Choose 2 answers

  1. ZKFailoverController
  2. ZooKeeper
  3. QuorumManager
  4. JournalNode

Answer(s): B,C



Which one of the following statements is FALSE regarding the communication between DataNodes and a federation of NameNodes in Hadoop 2.0?

  1. Each DataNode receives commands from one designated master NameNode.
  2. DataNodes send periodic heartbeats to all the NameNodes.
  3. Each DataNode registers with all the NameNodes.
  4. DataNodes send periodic block reports to all the NameNodes.

Answer(s): A



What is the term for the process of moving map outputs to the reducers?

  1. Reducing
  2. Combining
  3. Partitioning
  4. Shuffling and sorting

Answer(s): D



Which one of the following statements is true regarding a MapReduce job?

  1. The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers
  2. The default Hash Partitioner sends key value pairs with the same key to the same Reducer
  3. The reduce method is invoked once for each unique value
  4. The Mapper must sort its output of (key.value) pairs in descending order based on value

Answer(s): A



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