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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
1. Which daemon spawns child JVMs to perform MapReduce processing?
A) NameNode
B) JobTracker
C) TaskTracker
D) Secondary NameNode
E) DataNode
2. It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)
A) To help HDFS deliver consistent performance under heavy loads.
B) To ensure that all blocks in the cluster are 128MB in size.
C) To ensure that there is consistent disk utilization across the DataNodes.
D) To improve data locality for MapReduce tasks.
E) To ensure that there is capacity in HDTS for additional data.
3. Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?
A) Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
B) The metadata in the RAM on the NameNode is flushed to disk.
C) The change is written to the NameNode disk.
D) The metadata in RAM on the NameNode is updated.
E) The metadata in RAM on the NameNode is flushed disk.
F) The change is written to the edits file.
4. What metadata is stored on a DataNode when a block is written to it?
A) None. Only the block itself is written.
B) Node location of each block belonging to the same namespace.
C) Checksums for the data in the block, as a separate file.
D) Information on the file's location in HDFS.
5. What action occurs automatically on a cluster when a DataNode is marked as dead?
A) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
B) 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.
C) 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.
D) 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.
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: A,C,E | Question # 3 Answer: E,F | Question # 4 Answer: B | Question # 5 Answer: A |
By Reuben
