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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Once a client application validates its identity and is granted access to file in a cluster. What is the reminder of read path back to the client?

A) The namenode maps the read request against the block locations in it's stored metadata the block id's are stored by their distance to the client and moved to the datanode closest to the client according to hadoop rac topology. The client application then reads the blocks from the single datanode
B) The namenode gives the client the block ID's and a list of Datanodes on which those blocks are found. And the application reads the block directly from the datanodes
C) the namenode maps the read request against the block locations in its stored metadata and reads those blocks from the datanodes. The client applications then read the block from the namenode

2. How many mappers required for a map reduce, job determine on a cluster running map reduce V1 (MRv1)?

A) The number mappers is equal to no of input splits calculated by client submitting
B) the developer specifies the number in the job configuration
C) the jobtracker chooses the number based on no of available nodes
D) The number of mappers is calculated by namenode based on the number of HDFS blocks in the files

3. Using cloudera manager on CDH4 cluster running mapreduce V1(MRv1), you delete a tasktracker role instance from a host that also a runs a datanode role instance and a region server role instance.cloudera
Manager make changes to the cluster and prompts you to the accept the changes.
What other configuration option will cloudera manager automatically prompt you to change?

A) the option to immediately rebalance the cluster
B) The option to failover to the instance by namenode
C) the option to specify an alternate slave host to place the received data node role instance
D) The option to change java maximum heap sizes for the other role instances

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 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.

5. 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 cannot delete the file, but other can
C) HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files
D) the owner and group can read the file other can't
E) the owner and group can modify the contents of the file other can't

Solutions: