Explain how do ‘map’ and ‘reduce’ works?
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What do you know by storage and compute node?
when hadoop enter in safe mode?
Do we need to give a password, even if the key is added in ssh?
Mention what is the number of default partitioner in Hadoop?
How many Daemon processes run on a Hadoop system?
What does ‘jps’ command do?
Have you ever used Counters in Hadoop. Give us an example scenario?
Define tasktracker.
What happens to job tracker when namenode is down?
What is speculative execution in Hadoop?
What platform and java version are required to run hadoop?
What is a Task instance in Hadoop? Where does it run?1
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