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最新的 CCDH CCD-410 免費考試真題:

1. For each intermediate key, each reducer task can emit:

A) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
B) One final key-value pair per value associated with the key; no restrictions on the type.
C) One final key-value pair per key; no restrictions on the type.
D) As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
E) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.

2. A client application creates an HDFS file named foo.txt with a replication factor of 3. Identify which best describes the file access rules in HDFS if the file has a single block that is stored on data nodes A, B and C?

A) The file will be marked as corrupted if data node B fails during the creation of the file.
B) Each data node stores a copy of the file in the local file system with the same name as the HDFS file.
C) The file can be accessed if at least one of the data nodes storing the file is available.
D) Each data node locks the local file to prohibit concurrent readers and writers of the file.

3. Given a directory of files with the following structure: line number, tab character, string:
Example:
1abialkjfjkaoasdfjksdlkjhqweroij
2kadfjhuwqounahagtnbvaswslmnbfgy
3kjfteiomndscxeqalkzhtopedkfsikj
You want to send each line as one record to your Mapper. Which InputFormat should you use to complete the line: conf.setInputFormat (____.class) ; ?

A) KeyValueFileInputFormat
B) SequenceFileAsTextInputFormat
C) BDBInputFormat
D) SequenceFileInputFormat

4. You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

A) Decrease the block size on your remaining files.
B) Increase the amount of memory for the NameNode.
C) Increase the block size on your remaining files.
D) Decrease the block size on all current files in HDFS.
E) Increase the block size on all current files in HDFS.
F) Increase the number of disks (or size) for the NameNode.

5. Analyze each scenario below and indentify which best describes the behavior of the default partitioner?

A) The default partitioner assigns key-values pairs to reduces based on an internal random number generator.
B) 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.
C) The default partitioner implements a round-robin strategy, shuffling the key-value pairs to each reducer in turn. This ensures an event partition of the key space.
D) The default partitioner computes the hash of the key and divides that valule modulo 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 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.

問題與答案：