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最新的 CCAH CCA-470 免費考試真題:

1. You are planning a Hadoop duster, and you expect to be receiving just under 1TB of data per week which will be stored on the cluster, using Hadoop's default replication. You decide that your slave nodes will be configured with 4 x 1TB disks.
Calculate how many slave nodes you need to deploy at a minimum to store one year's worth of data.

A) 100 slave nodes
B) 100 slave nodes
C) 10 slave nodes
D) 50 slave nodes

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

3. 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) Information on the file's location in HDFS.
D) Checksums for the data in the block, as a separate file.

4. Identity four pieces of cluster information that are stored on disk on the NameNode?

A) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
B) A catalog of DataNodes and the blocks that are stored on them.
C) Names of the files in HDFS.
D) The status of the heartbeats of each DataNode.
E) File permissions of the files in HDFS.
F) The directory structure of the files in HDFS.
G) An edit log of changes that have been made since the last snapshot of the NameNode.

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

問題與答案：