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how can you debug Hadoop code?
Explain the process of spilling in MapReduce?
What are the various InputFormats in Hadoop?
What is the relation between MapReduce and Hive?
If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
what is Speculative Execution?
What is identity mapper and chain mapper?
what is JobTracker in Hadoop? What are the actions followed by Hadoop?
How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?
How to write a custom partitioner for a Hadoop MapReduce job?
What is mapper in map reduce?
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