Instantly download CCD-333 updated real questions
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Updated: Sep 02, 2025
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Cloudera Certified Developer for Apache Hadoop Sample Questions:
1. 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 most memory
B) The node on which this InputSplit is stored
C) The node with the most free local disk space
D) The node with the lowest system load
2. Custom programmer-defined counters in MapReduce are:
A) Lightweight devices for bookkeeping within MapReduce programs.
B) Lightweight devices for synchronization within MapReduce programs. You can use counters to coordinate execution between a mapper and a reducer.
C) Lightweight devices for ensuring the correctness of a MapReduce program. Mappers Increment counters, and reducers decrement counters. If at the end of the program the counters read zero, then you are sure that the job completed correctly.
3. You need to create a GUI application to help your company's sales people add and edit customer information. Would HDFS be appropriate for this customer information file?
A) Yes, because HDFS is optimized for fast retrieval of relatively small amounts of data.
B) Yes, because HDFS is optimized for random access writes.
C) No, because HDFS is optimized for write-once, streaming access for relatively large files.
D) No, because HDFS can only be accessed by MapReduce applications.
4. Combiners Increase the efficiency of a MapReduce program because:
A) They aggregate intermediate map output horn a small number of nearby (i.e., rack-local) machines and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.
B) They aggregate intermediate map output locally on each individual machine and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.
C) They provide an optimization and reduce the total number of computations that are needed to execute an algorithm by a factor of n, where is the number of reducer.
D) They provide a mechanism for different mappers to communicate with each Other, thereby reducing synchronization overhead.
5. In a large MapReduce job with m mappers and r reducers, how many distinct copy operations will there be in the sort/shuffle phase?
A) mxr (i.e., m multiplied by r)
B) mr (i.e., m to the power of r)
C) m
D) r
E) m+r (i.e., m plus r)
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: A |
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