How does fault tolerance work in mapreduce?
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what are the most common input formats defined in Hadoop?
What are ‘maps’ and ‘reduces’?
how can you check whether Namenode is working beside using the jps command?
What is the Reducer used for?
For a job in Hadoop, is it possible to change the number of mappers to be created?
How to set the number of mappers for a MapReduce job?
How to create a custom key and custom value in MapReduce Job?
What is RecordReader in a Map Reduce?
What is the purpose of textinputformat?
Is it possible to rename the output file?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
How is reporting controlled in hadoop?
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