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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. In a cluster configured with HDFS High Availability (HA) but NOT HDFS federation, each map task run:

A) In the same Java Virtual Machine as the DataNode.
B) In the same Java Virtual Machine as the JobTracker.
C) In its own Java Virtual Machine.
D) In the same Java Virtual Machine as the TaskTracker

2. You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do
not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

A) Two active NameNodes and one Standby NameNode
B) Two active NameNodes and two Standby NameNodes
C) One active NameNode and one Standby NameNode
D) Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.

3. 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) Capacity Scheduler
B) Completely Fair Scheduler (CFS)
C) FIFO Scheduler
D) Fair Scheduler

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 9 blocks will be return randomly to the nodes; some may receive multiple blocks some may receive none
C) Reducer don't write blocks into HDFS
D) All 9 nodes will each receive exactly one block
E) 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

5. You configure your hadoop cluster with mapreduce V1 (MRv1) along with HDFS high availability (HA) Quorum-based storage. On which nodes should you configure and run your journal node daemon(s) to guarantee a quorum?

A) On each datanode
B) Namenode, standby namenode and jobtracker
C) standby namenode, jobtracker, resourcemanager
D) Jobtracker
E) Namenode and standby namenode
F) Namenode
G) standby namenode

Solutions: