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最新的 HCAHD Apache-Hadoop-Developer 免費考試真題:

1. You want to Ingest log files Into HDFS, which tool would you use?

A) HCatalog
B) Flume
C) Ambari
D) Sqoop

2. 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.

3. Which of the following tool was designed to import data from a relational database into HDFS?

A) HCatalog
B) Flume
C) Ambari
D) Sqoop

4. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A) It returns a reference to a Writable object from an object pool.
B) It returns a reference to a different Writable object time.
C) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
D) It returns a reference to the same Writable object if the next value is the same as the previous value, or a new Writable object otherwise.
E) It returns a reference to the same Writable object each time, but populated with different data.

5. Which one of the following is NOT a valid Oozie action?

A) pig
B) mrunit
C) hive
D) mapreduce

問題與答案：