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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. 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) 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.
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) Reducers don't write blocks into HDFS

2. 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 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 informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.

3. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) The file will consume 1152MB of space in the cluster
B) The file will be split into three blocks when initially written into the cluster
C) The third block will be 64MB
D) Each block will be replicated nine times
E) Each block will be replicated three times
F) All three blocks will be 128MB
G) The third Initial block will be 44 MB
H) Two of the initial blocks will be 128MB

4. In the context of configuring a Hadoop cluster for HDFS High Availability (HA), 'fencing' refers to:

A) Isolating the standby NameNode from write access to the fsimage and edits files.
B) Isolating a failed NameNode from write access to the fsimage and edits files so that is cannot resume write operations if it recovers.
C) Isolating both HA NameNodes to prevent a client application from killing the NameNode daemons.
D) Isolating the cluster's master daemon to limit write access only to authorized clients.

5. You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?

A) For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
B) Increase the IO.sort.mb as high you can, as close to 1GB as possible.
C) Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.
D) Decrease the io.sort.mb value below 100M

Solutions: