Online Access Free CCA-470 Exam Questions

Under which of the following scenarios 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 workload consumes a large amount of input data, relative to the entire Canada of HDFS.
• B.When the typical workload generates a large amount of intermediate data, on the order of the input data itself.
• C.When the typical workload consists of processor-intensive tasks.
• D.When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.

Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

• A.Client application B returns an error
• B.Client application B must wait until the entire file has been written, and will then read its entire contents.
• C.Client application on B can read the 300MB that has been written so far.
• D.Application B can read 256MB of the file

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

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

Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

• A.JobTracker
• B.ResourceManager
• C.ApplicationMaster
• D.TaskTracker
• E.NameNode
• F.NodeManager
• G.DataNode

You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

• A.The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
• B.The file successfully writes to /users/reports/myreports/myreport.txt.
• C.The client throws an exception.
• D.The file writes fails silently; no file is written, no error is reported.