Explanation:Environment Variable is set using cmdenv command. 5. Point out the wrong statement :
A. Hadoop works better with a small number of large files than a large number of small files
B. CombineFileInputFormat is designed to work well with small files
C. CombineFileInputFormat does not compromise the speed at which it can process the input in a typical MapReduce job
D. None of the mentioned
Answer:A
Explanation:Environment Variable is set using cmdenv command. 5. Point out the wrong statement :
A. Hadoop works better with a small number of large files than a large number of small files B. CombineFileInputFormat is designed to work well with small files C. CombineFileInputFormat does not compromise the speed at which it can process the input in a typical MapReduce job D. None of the mentioned
Explanation:If the file is very small (“small” means significantly smaller than an HDFS block) and there are a lot of them, then each map task will process very little input, and there will be a lot of them (one per file), each of which imposes extra bookkeeping overhead. 6. The ________ option allows you to copy jars locally to the current working directory of tasks and automatically unjar the files.