Cloudera CCAH CCA-410

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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. When requesting a file, how does HDFS retrieves the blocks associated with that file?

A) the namenode reads the block ID's from disk
B) the namenode requires the datanode for the block ID's
C) The namenode reads the block ID's from memory
D) the client polls the datanodes for the block ID's

2. 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) Two active NameNodes and one Standby NameNode
B) One active NameNode and one Standby NameNode
C) Two active NameNodes and two Standby NameNodes
D) Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.

3. What does each block of a file contain where it is return into HDFS?

A) Each block has a header and footer containing metadata
B) Each block writes a separate meta file containing information on the file name of which the block is a part
C) Each block as a header containing metadata
D) Each block contains only data from the file

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

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

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

A) The clients sends the data to the name node, which then writes those blocks to the data nodes
B) The client queries the name node, which returns information on which data nodes to use. Then client writes to those 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

Solutions: