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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

2. 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 order of execution of tasks within a job may vary.
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) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
E) Tasks are scheduled in the order of their jobs' submission.
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.

3. You set mapred.tasktracker.reduce.tasks.maximum to a value of 4 on a cluster running mapreduce v1 (MRv1). How many reducers will run for any given job?

A) Maximum of 4 reducers, but the actual number of reducers that run for any given job is based on the volume of input data
B) a maximum of 4 reducer's, but the actual number of reducer's that run for any given job is based on the volume intermediate data.
C) Four reducer's will run. Once set by the cluster administrator, this parameter can't be overridden
D) The number of reducer's for any given job is set by the developer

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

5. 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) All 9 nodes will each receive exactly one block
B) The 9 blocks will be return to 3 nodes, such that each of the three get's one copy of each block
C) The 9 blocks will be return randomly to the nodes; some may receive multiple blocks some may receive none
D) 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
E) Reducer don't write blocks into HDFS

Solutions: