Name some companies that use Hadoop?
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What is speculative execution in Hadoop?
How many JVMs run on a slave node?
Can we do online transactions(oltp) using hadoop?
Mention what is the number of default partitioner in Hadoop?
How the HDFS Blocks are replicated?
On what basis Namenode will decide which datanode to write on?
How Mapper is instantiated in a running job?
How can we change the split size if our commodity hardware has less storage space?
Explain the shuffle?
Which are the two types of 'writes' in HDFS?
What are the most commonly defined input formats in Hadoop?
Explain the hadoop-core configuration?
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