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

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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. In the execution of a MapReduce job, where does the mapper place the intermediate data in each map task?

A) The mapper stores the intermediate data on the underlying filesystem of the local disk of the machine which ran the map task
B) The mapper transfers the intermediate data to the jobtracker, which then sends it to the reducers
C) The mapper transfer the intermediate data immediately to the reducers as it is generated by map task.
D) The hadoop framework holds the intermediate data in the task trackers memory until it is transferred to the reducers

2. You configure your hadoop development cluster with both mapreduce frameworks, mapreduceV1 (MRv1) and mapreduce v2 (MRv2/YARN). You plan to run only one set of mapreduce daemons at a time in this development environment (running both simultaneously results in an unsuitable cluster but configure in both moving between them is fine). Which two mapreduce (capitation) daemons do you need to configure to run on your masternodes?

A) Journalnode
B) Applicationmaster
C) Nodemanager
D) Resourcemanager
E) Containermanager
F) Jobtracker

3. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
B) The NameNode send a broadcast across the network when it first starts, and DataNodes
respond.
C) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
D) DataNodes heartbeat in the master on a regular basis.

4. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
B) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
C) The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
D) The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.

5. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?

A) The block size of files in the cluster will all be the exactly 64MB.
B) The block size of files in the duster will all at least be 64MB.
C) The block size of files in the cluster can be determined as the block is written.
D) The block size of files in the Cluster will all be multiples of 64M

Solutions: