How can you improve the performance of a Hadoop job by optimizing the use of Combiners?
A. Increase the number of Combiners
B. Decrease the number of Combiners
C. Use Combiners only for map tasks
D. Use Combiners for both map and reduce tasks
Answer: Option B
This Question Belongs to Hadoop >> Best Practices And Optimization Of Hadoop
What is a common optimization technique to improve Hadoop MapReduce performance?
A. Increase block size
B. Decrease block size
C. Maintain the default block size
D. Use fewer mappers
Which compression codec is commonly used for optimizing storage in Hadoop?
A. Gzip
B. Snappy
C. Bzip2
D. LZO
What is the purpose of Hadoop speculative execution?
A. To handle speculative workloads
B. To minimize resource usage
C. To mitigate the impact of slow-running tasks
D. To speed up task completion
How can data skew in a Hadoop job be addressed for optimization?
A. Increase the number of reducers
B. Decrease the number of reducers
C. Use a combiner function
D. Use a custom partitioner
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