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:

Question 1

Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?

A. The change is written to the NameNode disk.
B. Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
C. The metadata in RAM on the NameNode is updated.
D. The metadata in RAM on the NameNode is flushed disk.
E. The change is written to the edits file.
F. The metadata in the RAM on the NameNode is flushed to disk.

Question 2

You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?

A. Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
B. Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.
C. Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.
D. Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information

Question 3

What action occurs automatically on a cluster when a DataNode is marked as dead?

A. The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
B. The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
C. The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.
D. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.

Question 4

You are running two Hadoop clusters(cluster1 and cluster2), they run identical versions of hadoop.
You want to copy the data inside /home/foo/cluster1 to cluster2 into the directory /home/bar/
What is the correct distcp syntax to copy one directory tree from one cluster to the other cluster?

A. $ Hadoop distCp cluster1:/home/foo cluster2:/home/bar/
B. $ distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
C. $ distCp cluster1:/home/foo cluster2:/home/bar/
D. $ hadoop distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/

Question 5

What is the rule governing the formatting of the underlying filesystem in the hadoop cluster?

A. They must all use the same filesystem as the namenode
B. They must all be left as unformatted, rawdisk;hadoop uses raw unformatted disk for HDFS
C. They can use different file system
D. they must all be left as formatted raw disk, hadoop format them automatically
E. They must all use the same file system but this does not need to be the same filesystem as the filesystem used by the namenode

Solutions: