What happens when a DataNode fails during the write process?
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What is the best way to copy files between HDFS clusters?
What is the fundamental difference between a MapReduce InputSplit and HDFS block?
What is sqoop in Hadoop ?
Explain the Reducer's Sort phase?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
In mapreduce what is a scarce system resource? Explain?
what are the most common input formats defined in Hadoop?
What is a mapreduce algorithm?
What is mapper in map reduce?
What is identity mapper and chain mapper?
What is the difference between Hadoop and RDBMS?
Explain JobConf in MapReduce.