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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship between tasks and task templates?

A) There are always exactly as many task attempts as there are tasks.
B) There are always at least as many task attempts as there are tasks.
C) There are always at most as many tasks attempts as there are tasks.
D) The developer sets the number of task attempts on job submission.

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

3. When requesting a file, how does HDFS retrieves the blocks associated with that file?

A) The namenode reads the block ID's from memory
B) the namenode requires the datanode for the block ID's
C) the client polls the datanodes for the block ID's
D) the namenode reads the block ID's from disk

4. Your cluster has 9 slave nodes. The cluster block size is set to 128 MB and it's replication factor set to three.
How will the hadoop framework distribute block writes from a reducer into HDFS from a reducer outputting a 300MB file?

A) The 9 blocks will be return to 3 nodes, such that each of the three get's one copy of each block
B) The node on which the reducer is running will receive one copy of the each block. The other replicas will be placed on other nodes in the cluster
C) All 9 nodes will each receive exactly one block
D) Reducer don't write blocks into HDFS
E) The 9 blocks will be return randomly to the nodes; some may receive multiple blocks some may receive none

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

A) 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.
B) 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.
C) 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.
D) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.

Solutions: