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how can you debug Hadoop code?
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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.
mapper or reducer?
what is NameNode in Hadoop?
What is the need of key-value pair to process the data in MapReduce?
List the configuration parameters that have to be specified when running a MapReduce job.
What is a scarce system resource?
Explain the differences between a combiner and reducer
What is the inputsplit in map reduce software?
What happens when a DataNode fails during the write process?
What is LazyOutputFormat in MapReduce?
What is the difference between RDBMS with Hadoop MapReduce?
how can you check whether Namenode is working beside using the jps command?
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