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What jobtracker is in hadoop? What are the activities followed by hadoop?
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What happen on the namenode when a client tries to read a data file?
What are the common types of NOSQL data bases ?
Why slaves limited to 4000 in hadoop version 1?
How do you overwrite replication factor?
Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?
How to do ‘map’ and ‘reduce’ works?
If the hadoop administrator needs to make a change, which configuration file does he need to change?
What is 'jps'?
What is the relationship between Jobs and Tasks in Hadoop?
Mention what is distributed cache in hadoop?
What happen when namenode enters in safemode in hadoop?
How namenode handles data node failures?
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