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問題 #1

Which three processes does HDFS High Availability (HA) enable on your cluster?

A. Write data to two clusterssimultaneously
B. Shut one NameNode down for maintenance without halting the cluster
C. Manually 'fail over' between NameNodes
D. Configure unlimited hot standby NameNode.
E. Automatically 'fail over' between NameNodes if one goes down

問題 #2

How does HDFS Federation help HDFS Scale horizontally?

A. HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
B. HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
C. HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
D. HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.

問題 #3

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 #4

Hadoop provider web interface can be used for all of the following EXCEPT: (choose 1)

A. Keeping track of processor and memory utilization on each individual slave node.
B. Browsing files in HDFS.
C. Keeping track of the number of files and directories stored in HDFS.
D. Keeping track of tasks running on each individual slave node.
E. Keeping track of jobs running on the cluster.

問題 #5

Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A. In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
B. In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
C. In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
D. In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.

問題與答案：