How many instances of a jobtracker run on hadoop cluster?
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What problems have you faced when you are working on Hadoop code?
What is the difference between a Hadoop and Relational Database and Nosql?
Explain what if rack 2 and datanode fails?
What is the best hardware configuration to run Hadoop?
What are channel selectors?
What is Row Key?
How many maximum jvm can run on a slave node?
Input Split & Record Reader and what they do?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
Define streaming access?
What is your favourite tool in the hadoop ecosystem?
How will format the HDFS ?
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