Cloudera CCA-410 : Cloudera Certified Administrator for Apache Hadoop CDH4

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Cloudera CCA-410 Exam Syllabus Topics:

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

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

A) the client writes immediately to data nodes at random
B) The client immediately to data nodes based on the clusters rack locality settings
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 clients sends the data to the name node, which then writes those blocks to the data nodes

3. You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?

A) Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.
B) Increase the IO.sort.mb as high you can, as close to 1GB as possible.
C) Decrease the io.sort.mb value below 100M
D) For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.

4. When planning a hadoop cluster, what general rule governs the hardware requirements between master nodes and slave nodes?

A) the master nodes requires less memory and fewer number disk drives than the slave nodes
B) The master nodes require more memory and greater disk capacity then the slave nodes
C) The master and slave nodes should have the same hardware configuration
D) The master nodes requires more memory and no disk drives
E) The master nodes requires more memory but less disk capacity

5. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Application B can read 256MB of the file
B) Client application B must wait until the entire file has been written, and will then read its entire contents.
C) Client application on B can read the 300MB that has been written so far.
D) Client application B returns an error

Solutions: