Big Data Practice Quiz: Hadoop Quiz 2

1. With Hadoop, which Apache Commons Logging framework is used for logging?

• log4j
• jcl
• asf
• arnm

2. Which of the following options, when used with Hadoop fs -ls, recursively lists subdirectories?

• -R
• -d
• -L
• -c

3. Which of the following is NOT one of the HDFS daemons?

• NodeManager
• DataNode
• SecondaryNameNode
• NameNode

4. The hadoop daemon log output is written to the directory specified by which variable?

• $HADOOP_LOG_DIR
• $HADOOP_LOG
• $HADOOP_DIR
• $HADOOP_DIR_LOG

5. Which of the following statements is true regarding timestamps?

• None of the object stores in the Hadoop codebase support the atime access time feature.
• If an object is overwritten, the modification time will not be updated.
• The creation and initial modification times of an object will be that of the beginning of the write process, not when it ends.
• The timestamp on an object will be taken from the client and not from the object store infrastructure’s clock.

6. To start a Hadoop cluster, it is necessary to start both of which two clusters?

• HDFS and YARN
• SPARK and CLOUDERA
• YARN and SPARK
• NoSQL and HDFS

7. What is the command hadoop fs -setrep used for?

• To change the replication factor of a file
• To define caption attributes for a file
• To revert to a journaled copy of a key file
• To make an archive copy of a system file

8. One configuration variable that must be set in the environment is HADOOP_HEAPSIZE. The number that this is set to determines the heap size in what storage quantity?

• MB
• KB
• GB
• TB

9. The command hadoop fs -cat is used to copy source paths to stdout. What value does it return on error?

• -1
• 1
• 0
• -4

10. The Hadoop daemon log output directory defaults to where?

• $HADOOP_HOME/logs
• $HADOOP_LOGS
• $BIN_LOGS/home
• $USER_HOME/logs