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What is map/reduce job in hadoop?
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How to overwrite an existing output file during execution of mapreduce jobs?
In Hadoop, which file controls reporting in Hadoop?
What is a distributed cache in mapreduce framework?
In MapReduce, ideally how many mappers should be configured on a slave?
how indexing in HDFS is done?
Mention what is the next step after mapper or maptask?
What is OutputCommitter?
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?
Is it possible to search for files using wildcards?
What is Reducer in MapReduce?
Explain what you understand by speculative execution
Why is output file name in Hadoop MapReduce part-r-00000?
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