Cloudera Certified Developer for Apache Hadoop 認定 CCD-333 試験問題:
1. Your client application submits a MapReduce job to your Hadoop cluster. The Hadoop framework looks for an available slot to schedule the MapReduce operations on which of the following Hadoop computing daemons?
A) TaskTracker
B) JobTracker
C) NameNode
D) Secondary NameNode
E) DataNode
2. Which of the following statements best describes how a large (100 GB) file is stored in HDFS?
A) The file is replicated three times by default. Eachcopy of the file is stored on a separate datanodes.
B) The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default. Multiple blocks from the same file might reside on the same datanode.
C) The master copy of the file is stored on a single datanode. The replica copies are divided into fixed-size blocks, which are stored on multiple datanodes.
D) The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default.HDFS guarantees that different blocks from the same file are never on the same datanode.
E) The file is divided into variable size blocks, which are stored on multiple data nodes. Each block is replicated three times by default.
3. You are running a job that will process a single InputSplit on a cluster which has no other jobs currently running. Each node has an equal number of open Map slots. On which node will Hadoop first attempt to run the Map task?
A) The node with the lowest system load
B) The node with the most memory
C) The node with the most free local disk space
D) The node on which this InputSplit is stored
4. In a MapReduce job, the reducer receives all values associated with the same key. Which statement is most accurate about the ordering of these values?
A) The values are arbitrarily ordered, but multiple runs of the same MapReduce job will always have the same ordering.
B) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
C) The values are in sorted order.
D) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.
5. You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, Intwritable values. Which interface should your class implement?
A) Reducer <Text, Text, IntWritable, IntWritable>
B) Reducer <Text, IntWritable, Text, IntWritable>
C) Mapper <Text, IntWritable, Text, IntWritable>
D) Combiner <Text, Text, IntWritable, IntWritable>
E) Combiner <Text, IntWritable, Text, IntWritable>
質問と回答：
| 質問 # 1 正解： B | 質問 # 2 正解： D | 質問 # 3 正解： D | 質問 # 4 正解： B | 質問 # 5 正解： E |
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