CCD-410 무료 덤프문제 온라인 액세스

You need to perform statistical analysis in your MapReduce job and would like to call methods in the Apache Commons Math library, which is distributed as a 1.3 megabyte Java archive (JAR) file. Which is the best way to make this library available to your MapReducer job at runtime?

• A.When submitting the job on the command line, specify the -libjars option followed by the JAR file path.
• B.Have your system administrator copy the JAR to all nodes in the cluster and set its location in the HADOOP_CLASSPATH environment variable before you submit your job.
• C.Have your system administrator place the JAR file on a Web server accessible to all cluster nodes and then set the HTTP_JAR_URL environment variable to its location.
• D.Package your code and the Apache Commands Math library into a zip file named JobJar.zip

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

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

You want to run Hadoop jobs on your development workstation for testing before you submit them to your production cluster. Which mode of operation in Hadoop allows you to most closely simulate a production cluster while using a single machine?

• A.Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.
• B.Run the hadoop command with the -jt local and the -fs file:///options.
• C.Run all the nodes in your production cluster as virtual machines on your development workstation.
• D.Run simldooop, the Apache open-source software for simulating Hadoop clusters.

Identify the tool best suited to import a portion of a relational database every day as files into HDFS, and generate Java classes to interact with that imported data?

• A.Sqoop
• B.Pig
• C.fuse-dfs
• D.Hive
• E.Oozie
• F.Flume
• G.Hue

You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

• A.Decrease the block size on all current files in HDFS.
• B.Increase the block size on all current files in HDFS.
• C.Decrease the block size on your remaining files.
• D.Increase the number of disks (or size) for the NameNode.
• E.Increase the block size on your remaining files.
• F.Increase the amount of memory for the NameNode.