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hadoop (4.papers)

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hadoop bigdata questions and answers

1
The command "hadoop  fs-test-z URI"gives the result 0 if
  1. if the file is zero length
  2. if the file does not exist
  3. if the path is empty
  4. All the above
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3
Among the following which command lists the blocks that make up each file in the system
  1. hdfs fchk /-files -blocks.
    
  2. hdfs fchk/-blocks -files.
  3. hdfs fsck/-files -blocks.
  4. hdfs fsck/-blocks -files.
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4
Running  start-dfs.sh results in
  1. starting namenode
  2. starting datanode
  3. starting resource manager
  4. starting namenode and datanode
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9
Zookeeper ensures that.
  1. All the name nodes are activelyb serving the client requests.
  2. A failover is triggered when any of the datanode fails.
    
  3. Only one name node is actively serving the client requests.
  4. All the above
    
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10
Among the following which is not a schedular options available with YARN?
  1. capacity schedular
  2. FIFO schedular
  3. Fair schedular
  4. Optimal schedular
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11
Which of the following command will start yarn daemons.
  1. $ start-yarn.sh
  2. $ start-dfs.sh
  3. $ cd.sh
  4. $ start.sh
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13
what will the command  rm<path> do?
  1. Removes the file identified by the path and recursively deletes any child entries.
  2. Removes the file identified by the path.
    
  3. Retrieves all the files from the identified path.
  4. All the above.
    
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14
Among the following identify the command that shows the last 1KB of file on stdout.
  1. tail{-f}
    <filename>
    
  2. tail[-f]
    <filename>
  3. tail [f]
    <file2name>
    
  4. .tail [-f]
    <file2name>
    
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15
which of the following command is used to verify the files in the input directory.
  1. $HADOOP_HOME/BIN fs-ls/ input_dir/
  2. $HADOOP_HOME/hadoop fs -ls input_dir/
  3. $HADOOP_HOME/bin/hadoop fs -ls input_dir/
  4. $HADOOP_HOME/bin fs -ls/hadoop input_dir/
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16
kill <job-id>means
  1. Kills the task.
  2. Kills the job.
  3. Both a and b.
  4. None
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18
Portnumber for jobtracker
  1. 50030
  2. 50020
  3. 50040
  4. 50070
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19
Tasktracker portnumber is
  1. 50060
  2. 50080
  3. 50040
  4. 50070
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20
Among the following identify the false statement
  1. NAS runs on a single machine.
  2. HDFS runs on clusters of different systems.
  3. NAS has data redundancy.
    
  4. HDFS has data redundancy because of the replication protocal.
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