CCA-410 무료 덤프문제 온라인 액세스

A slave node in your cluster has 24GB of Ram and 12 physical processor cores on hyper threading-enabled processor. You set the value of mapped. child.java.opts to -Xmx1G, and the value of mapred.tasktracker.map.tasks.maximum to 12. What is the appropriate value to set for mapred.Tastracker.reduce.tasks.maximum?

• A.2
• B.16.
• C.24
• D.20
• E.12
• F.6

Under which scenario would it be most appropriate to consider using faster (e.g 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

• A.When the typical workloads consumes a large amount of input data, relative to the entire capacity of HDFS.
• B.When the typical workloads generates a large amount of intermediate data, on the order of the input data itself.
• C.When the typical workloads consists of processor-intensive tasks.
• D.When the typical workloads generates a large amount of output data, significantly larger than the amount of intermediate data.

You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do
not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

• A.Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
• B.Two active NameNodes and one Standby NameNode
• C.Two active NameNodes and two Standby NameNodes
• D.One active NameNode and one Standby NameNode

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

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

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 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 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.