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Why is Apache Spark faster than Hadoop MapReduce?
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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.
Explain the Reducer's reduce phase?
How to specify more than one directory as input in the Hadoop MapReduce Program?
Where sorting is done in Hadoop MapReduce Job?
How does inputsplit in mapreduce determines the record boundaries correctly?
how can you check whether Namenode is working beside using the jps command?
How to configure the number of the Combiner in MapReduce?
What is a Speculative Execution in Hadoop MapReduce?
What is the difference between Job and Task in MapReduce?
what job does the conf class do?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
What does conf.setmapper class do?
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