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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What are the permissions of a file in HDFS with the following:rw-rw-r-x?

A) No one can modify the content of the file
B) the owner and group can modify the contents of the file other can't
C) the owner and group can read the file other can't
D) HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files
E) the owner and group cannot delete the file, but other can

2. 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 and all the slave nodes, 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 only, and configure a shared remote Hive Metastore.

3. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) Reducers don't write blocks into HDFS
B) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
C) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
D) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.

4. 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) Information on the file's location in HDFS.
C) Node location of each block belonging to the same namespace.
D) None. Only the block itself is written.

5. Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?

A) The metadata in the RAM on the NameNode is flushed to disk.
B) The metadata in RAM on the NameNode is updated.
C) The change is written to the edits file.
D) The metadata in RAM on the NameNode is flushed disk.
E) Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
F) The change is written to the NameNode disk.

Solutions: