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For a Hadoop job, how will you write a custom partitioner?
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What happens when the node running the map task fails before the map output has been sent to the reducer?
Can MapReduce program be written in any language other than Java?
what job does the conf class do?
Explain the Reducer's reduce phase?
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?
Can we submit the mapreduce job from slave node?
what happens when Hadoop spawned 50 tasks for a job and one of the task failed?
What happens when a datanode fails ?
how can you debug Hadoop code?
What is the function of mapreduce partitioner?
How data is spilt in Hadoop?
How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?
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