Cloudera CCA-410 : Cloudera Certified Administrator for Apache Hadoop CDH4

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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?

A) Any machine running the DataNode daemon can immediately join the cluster.
B) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
C) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.
D) No new can be added to the cluster until you specify them in the dfs.hosts file.

2. Which three file actions can execute as you write a file into HDFS?

A) You can delete the file
B) You can index the file
C) You can rename the file
D) You can update the files contents
E) You can move the file

3. What metadata is stored on a DataNode when a block is written to it?

A) Checksums for the data in the block, as a separate file.
B) None. Only the block itself is written.
C) Node location of each block belonging to the same namespace.
D) Information on the file's location in HDFS.

4. Your developers request that you enable them to use Hive on your Hadoop cluster. What do install and/or configure?

A) Install the Hive interpreter on the client machines only, and configure a shared remote Hive Metastore.
B) Install the Hive interpreter on the master node running the JobTracker, and configure a shared remote Hive Metastore.
C) Install the Hive interpreter on the client machines and all nodes on the cluster
D) Install the Hive Interpreter on the client machines and all the slave nodes, and configure a shared remote Hive Metastore.

5. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) Because there are seven racks the block is written to a node on each rack
B) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack
C) One copy of the block is written to a node in each of three racks
D) All three of the block are written to nodes on the same rack

Solutions: