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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Once a client application validates its identity and is granted access to file in a cluster. What is the reminder of read path back to the client?

A) The namenode gives the client the block ID's and a list of Datanodes on which those blocks are found. And the application reads the block directly from the datanodes
B) the namenode maps the read request against the block locations in its stored metadata and reads those blocks from the datanodes. The client applications then read the block from the namenode
C) The namenode maps the read request against the block locations in it's stored metadata the block id's are stored by their distance to the client and moved to the datanode closest to the client according to hadoop rac topology. The client application then reads the blocks from the single datanode

2. 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) 10
C) We cannot say; the number of Mappers is determined by the developer
D) 1

3. 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.

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

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

5. Identify which two daemons typically run each slave node in a Hadoop cluster running MapReduce v1 (MRv1)

A) NodeManager
B) NameNode
C) DataNode
D) Secondary NameNode
E) TaskTracker
F) JobTracker

Solutions: