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How many maps are there in a particular job?
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Mention what is the data storage component used by hadoop?
What is the job tracker role in hadoop?
What are the network requirements for hadoop?
If the hadoop administrator needs to make a change, which configuration file does he need to change?
How can one check whether NameNode is working or not?
What is difference between secondary namenode, checkpoint namenode & backupnode?
What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?
If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?
What is the default replication factor in Hadoop and how will you change it?
What is check pointing in hadoop?
What is heartbeat in hadoop?
What is difference between reducer and combiner?
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