What is the block size in Hadoop?
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Explain the difference between an inputsplit and a block?
After increasing the replication level, I still see that data is under replicated. What could be wrong?
If DataNode increases, then do we need to upgrade NameNode in Hadoop?
What is the role of the namenode?
What do you think about the speculative execution?
What are the side effects of not running a secondary name node?
What are the four modules that make up the Apache Hadoop framework?
What is Disk Balancer in Hadoop?
In hadoop_pid_dir, what does pid stands for?
What is Rack Awareness? What is its need in Hadoop?
How Hadoop is cost-effective?
What are the modes in which Hadoop run?
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