In mapreduce what is a scarce system resource? Explain?
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For a job in Hadoop, is it possible to change the number of mappers to be created?
what is JobTracker in Hadoop? What are the actions followed by Hadoop?
What is SequenceFileInputFormat?
Explain InputSplit in Hadoop MapReduce?
mapper or reducer?
what is a Task Tracker in Hadoop?
Is it necessary to write a mapreduce job in java?
What is a RecordReader in Hadoop MapReduce?
Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?
What is heartbeat in hdfs? Explain.
Explain the process of spilling in MapReduce?
What happens when a datanode fails ?
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