最新的CCDH認證 CCD-333考試題庫

問題1

Your cluster has 10 DataNodes, each with a single 1 TB hard drive. You utilize all your disk capacity for HDFS, reserving none for MapReduce. You implement default replication settings. What is the storage capacity of your Hadoop cluster (assuming no compression)?

A. about 5 TB

B. about 10 TB

C. about 3 TB

D. about 11 TB

正確答案: C

說明：（僅 VCESoft 成員可見）

問題2

You need to import a portion of a relational database every day as files to HDFS, and generate Java classes to Interact with your imported data. Which of the following tools should you use to accomplish this?

A. Hive

B. Pig

C. Oozie

D. Hue

E. Sqoop

F. fuse-dfs

G. Flume

正確答案: E

說明：（僅 VCESoft 成員可見）

問題3

Which of the Following best describes the lifecycle of a Mapper?

A. The JobTracker calls the FastTracker's configure () method, then its map () method and finally its closer ()

B. The TaskTracker spawns a new Mapper to process all records in a single input split.

C. The JobTracker spawns a new Mapper to process all records in a single file.

D. The TaskTracker spawns a new Mapper to process each key-value pair.

正確答案: D

說明：（僅 VCESoft 成員可見）

問題4

All keys used for intermediate output from mappers must do which of the following:

A. Implement WritableComparable

B. Use a comparator for speedy sorting

C. Be a subclass of Filelnput-Format

D. Override isSplitable

E. Be compressed using a splittable compression algorithm.

正確答案: A

說明：（僅 VCESoft 成員可見）

問題5

What is the behavior of the default partitioner?

A. The default partitioner computes the hash of the key. Hash values between specific ranges are associated with different buckets, and each bucket is assigned to a specific reducer.

B. The default partitioner implements a round robin strategy, shuffling the key value pairs to each reducer in turn. This ensures an even partition of the key space.

C. The default partitioner assigns key value pairs to reducers based on an internal random number generator.

D. The default partitioner computes the hash of the value and takes the mod of that value with the number of reducers. The result determines the reducer assigned to process the key value pair.

E. The default partitioner computes the hash of the key and divides that value modulo the number of reducers. The result determines the reducer assigned to process the key-value pair.

正確答案: E

說明：（僅 VCESoft 成員可見）

問題6

To process input key-value pairs, your mapper needs to load a 512 MB data file in memory. What is the best way to accomplish this?

A. Serialize the data file, insert it in the Jobconf object, and read the data into memory in the configure method of the mapper.

B. Place the data file in theDistributedCacheand read the data into memory in the map method of the mapper.

C. Place the datafile in the DataCache and read the data into memory in the configure method ofthe mapper.

D. Place the data file in theDistributedCacheand read the data into memory in the configure method of the mapper.

正確答案: B

說明：（僅 VCESoft 成員可見）

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