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最新的 CCAH CCA-470 免費考試真題:

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

2. 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.

3. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

A) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
B) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
C) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.
D) You cannot configure a client to access both directories in the current implementation of HDFS Federation.

4. 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.

5. You have a cluster running with the Fair in Scheduler enabled. There are currently no jobs running on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later,
you submit job B, Now job A and job B are running on the cluster at the same time.
Which of the following describes how the Fair Scheduler operates? (Choose 2)

A) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
B) When job A gets submitted, it doesn't consume all the task slots.
C) When job A gets submitted, it consumes all the task slots.
D) When job B gets submitted, job A has to finish first, before job B can get scheduled.

問題與答案：