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1. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?
A) 30
B) We cannot say; the number of Mappers is determined by the developer
C) 10
D) 1
2. Choose three reasons why should you run the HDFS balancer periodically?
A) To help HDFS deliver consistent performance under heavy loads.
B) To improve data locality for MapReduce tasks.
C) To ensure that there is consistent disk utilization across the DataNodes.
D) To ensure that there is capacity in HDFS tor additional data.
E) To ensure that all blocks in the cluster are 128MB in size.
3. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)
A) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
B) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
C) DataNodes heartbeat in the master on a regular basis.
D) The NameNode send a broadcast across the network when it first starts, and DataNodes
respond.
4. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?
A) They must be formatted as HDFS
B) They may be formatted in nay Linux filesystem
C) They must be formatted as either ext3 or ext4
D) They must not be formatted - - HDFS will format the filesystem automatically
5. 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) Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
B) One active NameNode and one Standby NameNode
C) Two active NameNodes and one Standby NameNode
D) Two active NameNodes and two Standby NameNodes
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: A,B,C | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: B |
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