Clarify how ordering in hdfs is finished?
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Can you explain combiner?
What is active and passive NameNode in Hadoop?
What is streaming access?
Which modes can Hadoop be run in? List a few features for each mode?
What are the limitations of Hadoop?
Give me the examples of Columnar database ?
What is High Availability feature in Hadoop2?
How NameNode tackle Datanode failures in Hadoop?
What is the role of the secondary namenode?
What are the actions followed by hadoop?
Define data cleansing?
How many job tracker processes can run on a single Hadoop cluster?
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