HADOOP-PR000007 무료 덤프문제 온라인 액세스

Which one of the following files is required in every Oozie Workflow application?

• A.job.properties
• B.Workflow.xml
• C.Config-default.xml
• D.Oozie.xml

Workflows expressed in Oozie can contain:

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

MapReduce v2 (MRv2/YARN) is designed to address which two issues?

• A.Ability to run frameworks other than MapReduce, such as MPI.
• B.Single point of failure in the NameNode.
• C.Standardize on a single MapReduce API.
• D.Resource pressure on the JobTracker.
• E.HDFS latency.
• F.Reduce complexity of the MapReduce APIs.

You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses
TextInputFormat: the mapper applies a regular expression over input values and emits key-values pairs
with the key consisting of the matching text, and the value containing the filename and byte offset.
Determine the difference between setting the number of reduces to one and settings the number of
reducers to zero.

• A.There is no difference in output between the two settings.
• B.With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With
  one reducer, instances of matching patterns are stored in multiple files on HDFS.
• C.With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of
  matching patterns are stored in a single file on HDFS.
• D.With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one
  reducer, all instances of matching patterns are gathered together in one file on HDFS.

Which HDFS command displays the contents of the file x in the user's HDFS home directory?

• A.hdfs fs -get x
• B.hadoop fs -cat x
• C.hadoop fs -Is x
• D.hadoop fs -cp x