How many maximum jvm can run on a slave node?
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What is your favourite tool in the hadoop ecosystem?
Explain how do ‘map’ and ‘reduce’ works?
What are the functions of NameNode?
How many instances of a jobtracker run on hadoop cluster?
What are the hadoop's three configuration files?
What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?
Explain why do we need hadoop?
Should we use RAID in Hadoop or not?
What is the jobtracker?
Can hbase run without hadoop?
What does the command mapred.job.tracker do?
Have you ever used Counters in Hadoop. Give us an example scenario?