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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) For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
D) 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.

2. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) All DataNodes simultaneously fail.
B) Seventy percent of DataNodes simultaneously fail.
C) Multiple racks simultaneously fail.
D) An entire rack fails.
E) Ten percent of DataNodes simultaneously fail.

3. For a MapReduce job, what's the relationship between tasks and task attempts?

A) There are always at least as many task attempts as there are tasks.
B) There are always at most as many task attempts as there are tasks.
C) There are always exactly as many task attempts as there are tasks.

4. What is the Secondary NameNode?

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

5. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
B) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
C) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
D) Tasks are scheduled in the order of their jobs' submission.
E) The order of execution of tasks within a job may vary.
F) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.

Solutions: