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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must be formatted as either ext3 or ext4
B) They must be formatted as HDFS
C) They may be formatted in nay Linux filesystem
D) They must not be formatted - - HDFS will format the filesystem automatically

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

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

3. How many mappers required for a map reduce, job determine on a cluster running map reduce V1 (MRv1)?

A) the developer specifies the number in the job configuration
B) The number mappers is equal to no of input splits calculated by client submitting
C) the jobtracker chooses the number based on no of available nodes
D) The number of mappers is calculated by namenode based on the number of HDFS blocks in the files

4. Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?

A) No new can be added to the cluster until you specify them in the dfs.hosts file.
B) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.
C) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
D) Any machine running the DataNode daemon can immediately join the cluster.

5. In a cluster configured with HDFS High Availability (HA) but NOT HDFS federation, each map task run:

A) In its own Java Virtual Machine.
B) In the same Java Virtual Machine as the TaskTracker
C) In the same Java Virtual Machine as the JobTracker.
D) In the same Java Virtual Machine as the DataNode.

Solutions: