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最新的 CCAH CCA-470 免費考試真題:

1. 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.

2. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) All DataNodes simultaneously fail.
B) An entire rack fails.
C) Multiple racks simultaneously fail.
D) Ten percent of DataNodes simultaneously fail.
E) Seventy percent of DataNodes simultaneously fail.

3. Which of the following scenarios makes HDFS unavailable?

A) TaskTracker failure
B) DataNode failure
C) JobTracker failure
D) NameNode failure
E) Secondary NameNode failure

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.

5. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes must all contain 4 x 2TB hard drives
B) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
C) The new nodes cannot contain more than 8TB of disk space
D) The new nodes can contain any amount of disk space

問題與答案：

問題 #1 答案： A

問題 #2 答案： D

問題 #3 答案： B

問題 #4 答案： D

問題 #5 答案： D