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1. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes must all contain 4 x 2TB hard drives
B) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
C) The new nodes cannot contain more than 8TB of disk space
D) The new nodes can contain any amount of disk space

2. A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A) The application reads the blocks directly from the DataNodes.
B) The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.
C) The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.

3. Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A) Nn01 is fenced, and nn02 becomes the active NameNode
B) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
C) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
D) Nn01 is fenced, and nn01 becomes the active NameNode

4. 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) Decrease the io.sort.mb value below 100M
C) Increase the IO.sort.mb as high you can, as close to 1GB as possible.
D) For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.

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

A) 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.
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 NameNode forces re-replication of all the blocks which were stored on the dead DataNode.

問題與答案：