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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?

A) 100 GB on each hard drive may not be used to store HDFS blocks
B) 25 GB on each hard drive may not be used to store HDFS Blocks
C) All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
D) a maximum of 100GB on each hard drive may be used to store HDFS blocks

2. Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?

A) Standby NameNode
B) JournalNode
C) Secondary NameNode
D) NameNode
E) BackupNode
F) CheckpointNode
G) NodeManeger

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. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor NameNode memory usage.
B) Ability to monitor the amount of free space on HDFS.
C) Ability to monitor processor utilization.
D) Ability to monitor number of files in HDFS.
E) Ability to monitor free task slots.

5. What metadata is stored on a DataNode when a block is written to it?

A) Checksums for the data in the block, as a separate file.
B) Node location of each block belonging to the same namespace.
C) Information on the file's location in HDFS.
D) None. Only the block itself is written.

Solutions: