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

1. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Du
B) Dskchk
C) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
D) The map-only checksum utility,
E) Fsck

2. Which scheduler would you deploy to ensure that your cluster allows short jobs to finish within a reasonable time without starving long-running jobs?

A) Completely Fair Scheduler (CFS)
B) FIFO Scheduler
C) Capacity Scheduler
D) Fair Scheduler

3. You have a cluster running with the Fair in Scheduler enabled. There are currently no jobs running on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later,
you submit job B, Now job A and job B are running on the cluster at the same time.
Which of the following describes how the Fair Scheduler operates? (Choose 2)

A) When job B gets submitted, job A has to finish first, before job B can get scheduled.
B) When job A gets submitted, it consumes all the task slots.
C) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
D) When job A gets submitted, it doesn't consume all the task slots.

4. Which two features does Kerberos security add to a Hadoop cluster?

A) Authentication for user access to the cluster against a central server
B) Encryption on all remote procedure calls (RPCs)
C) Encryption for data on disk ("at rest")
D) User authentication on all remote procedure calls (RPcs)
E) Root access to the cluster for users hdfs and mapred but non-root acess clients

5. How does HDFS Federation help HDFS Scale horizontally?

A) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
B) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
C) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
D) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.

Solutions: