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What is identity mapper and reducer? In which cases can we use them?
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How does fault tolerance work in mapreduce?
How is reporting controlled in hadoop?
Is YARN a replacement of Hadoop MapReduce?
what job does the conf class do?
What is Text Input Format?
How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
What are the various InputFormats in Hadoop?
Can we submit the mapreduce job from slave node?
How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?
what is storage and compute nodes?
How to optimize MapReduce Job?
What is the best way to copy files between HDFS clusters?
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