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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What does CDH packaging do on install to facilitate Kerberos security setup?

A) Creates a set of pre-configured Kerberos keytab files and their permissions.
B) Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
C) Creates users for hdfs and mapreduce to facilitate role assignment.
D) Creates and configures you kdc with default cluster values.
E) Creates directories for temp, hdfs, and mapreduce with correct permissions.

2. What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must restart all six DataNode daemons to apply the changes to the cluster.
B) You don't need to restart any daemon, as they will pick up changes automatically.
C) You must restart the NameNode daemon to apply the changes to the cluster
D) You must modify the configuration files on each of the six DataNode machines.
E) You must modify the configuration files on only one of the DataNode machine
F) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.

3. You set the value of dfs.block.size to 64MB in hdfs-site.xml on a client machine, but you set the same property to 128MB on your clusters name node. What happens when the client writes a file to HDFS?

A) An execution will be thrown when the client attempts to write the file, because the values are different.
B) A block size of 128MB will be used
C) The file will be written successfully with a block size of 64MB but client attempting to read the file will fail because the namenode believes the blocks to be 128MB in size
D) A block size of 64MB will be used

4. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) The DataNode JVM on one host is not active.
B) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
C) The HDFS cluster is in the safe mode.
D) One physical host crashed.

5. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) Each block will be replicated three times
B) Each block will be replicated nine times
C) Two of the initial blocks will be 128MB
D) The third Initial block will be 44 MB
E) The third block will be 64MB
F) The file will consume 1152MB of space in the cluster
G) All three blocks will be 128MB
H) The file will be split into three blocks when initially written into the cluster

Solutions: