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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A) DataNode
B) Node Manager
C) Resource Manager
D) Secondary NameNode
E) NameNode
F) Application Manager

2. Your cluster Mapreduce V1 (MVR1). What determines where blocks are return into HDFS client application?

A) The client queries the name node, which returns information on which data nodes to use. Then client writes to those data nodes.
B) The clients sends the data to the name node, which then writes those blocks to the data nodes
C) The client immediately to data nodes based on the clusters rack locality settings
D) the client writes immediately to data nodes at random

3. Choose three reasons why should you run the HDFS balancer periodically?

A) To help HDFS deliver consistent performance under heavy loads.
B) To ensure that there is capacity in HDFS tor additional data.
C) To improve data locality for MapReduce tasks.
D) To ensure that all blocks in the cluster are 128MB in size.
E) To ensure that there is consistent disk utilization across the DataNodes.

4. You has a cluster running with the Fail Scheduler enabled. There are currently no jobs running on the cluster 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 al the same time. How will the Fair' Scheduler handle these two Jobs?

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

5. You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

A) Run hadoop fs -du/and locate the DFS Remaining value.
B) Connect to http://mynamemode:50070/ and locate the DFS Remaining value.
C) Run hadoop dfsadmin -report and locate the DFS Remaining value.
D) Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.

Solutions: