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

1. 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) Increase the IO.sort.mb as high you can, as close to 1GB as possible.
B) Decrease the io.sort.mb value below 100M
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) For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.

2. You configure Hadoop cluster with both MapReduce frameworks, MapReduce v1 (MRv1) and MapReduce v2 (MRv2/YARN). Which two MapReduce (computational) daemons do you need to configure to run on your master nodes?

A) ApplicationMaster
B) JobTracker
C) ResourceManager
D) JournalNode
E) NodeManager

3. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must not be formatted - - HDFS will format the filesystem automatically
B) They must be formatted as either ext3 or ext4
C) They must be formatted as HDFS
D) They may be formatted in nay Linux filesystem

4. Someone in your data center unplugs a slave node by accident. Users of the cluster notice via the Hadoop Web UI that the cluster size has shrunken and express concerns about data loss and HDFS performance. The replication factor of all the files in the cluster is unchanged from the default of 3. What can you tell the users?

A) The HDFS filesystem is corrupt until the administrator re adds the DataNode to the cluster. The warnings associated with the event should be reported.
B) The NameNode will identify the outage and re-replicate the data when the clients receive connection failures to the DataNode, so the end users can disregard such warnings.
C) After identifying the outage, the NameNode will naturally re-replicate the data and there will be no data loss. The administrator can re-add the DataNode at any time. The client can disregard warnings concerned with this event. Data will be under-replicated but will become properly replicated over time.
D) The NameNode will re replicate the data after the administrator issues a special command. The data is not lost but is underreplicated until the administrator issues this command.

5. What is the Secondary NameNode?

A) A process purely intended to perform backups of the NameNode.
B) An alternate data channel for clients to reach HDFS, should the NameNode become too busy.
C) A data channel between the primary name node and the tertiary NameNode.
D) A standby NameNode, for high availability.
E) A process that performs a checkpoint operation on the files produced by the NameNode.

Solutions: