When the reducers are are started in a mapreduce job?
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how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
Can we submit the mapreduce job from slave node?
What is the difference between Hadoop and RDBMS?
Explain what are the basic parameters of a mapper?
What is an input reader in reference to mapreduce?
what is a sequence file in Hadoop?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
What is Mapper in Hadoop MapReduce?
What is RecordReader in a Map Reduce?
What is OutputCommitter?
Why Hadoop MapReduce?
What is map/reduce job in hadoop?
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