What is identity mapper and chain mapper?
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It can be possible that a Job has 0 reducers?
Define speculative execution?
how indexing in HDFS is done?
what is WebDAV in Hadoop?
Explain combiners.
Mention when to use Map reduce mode?
What are the various configuration parameters required to run a mapreduce job?
What is heartbeat in hdfs?
In Hadoop what is InputSplit?
How data is spilt in Hadoop?
Explain how do ‘map’ and ‘reduce’ work?
How to create custom key and custom value in MapReduce Job?