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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?

A) It is set by the Hadoop framework and is based on the number of InputSplits of the job.
B) It is set by the JobTracker based on the amount of intermediate data.
C) It is set by the developer.
D) It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.

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

3. What four functions do scheduling algorithms perform on hadoop cluster?

A) Reduce the total amount of computation necessary to complete a job.
B) Run jobs at periodic times of the day
C) Ensure data locality by ordering map tasks so that they run on data local maps slots
D) allow short jobs to complete even when large, long jobs (consuming a lot of resources are running)
E) support the implementation of service-level agreements for multiple cluster users
F) Reduce the job latencies in environment with multiple jobs of different sizes
G) Allow multiple users to share clusters in a predictable policy-guided manner

4. Your company stores user profile records in an OLTP database. You want to join these records with webserver logs. You have already ingested into the hadoop file system. What is the best way to obtain and ingest these user records?

A) Ingest with Pig's Load Command
B) Ingest with flume agents
C) Ingest using hives LOAD DATA command
D) Ingest using the HDFS put command
E) Ingest with SQL import
F) Ingest with hadoop streaming

5. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) DataNodes heartbeat in the master on a regular basis.
B) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
C) The NameNode send a broadcast across the network when it first starts, and DataNodes
respond.
D) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.

Solutions: