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How many Reducers run for a MapReduce job?
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When Namenode is down what happens to job tracker?
What is identity mapper and chain mapper?
How to write a custom partitioner for a Hadoop MapReduce job?
What is the need of MapReduce in Hadoop?
A number of combiners can be changed or not in MapReduce?
What does a 'MapReduce Partitioner' do?
Why MapReduce uses the key-value pair to process the data?
what does the text input format do?
what is a Task Tracker in Hadoop?
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.
how indexing in HDFS is done?
What do sorting and shuffling do?
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