What is a “Distributed Cache” in Apache Hadoop?
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How to keep HDFS cluster balanced?
What is a spill factor with respect to the ram?
what should be the ideal replication factor in hadoop?
What are combiners and its purpose?
What is rack-aware replica placement policy?
What are the limitations of importing RDBMS tables into Hcatalog directly?
What are watches?
How Mapper is instantiated in a running job?
Explain the difference between gen1 and gen2 hadoop with regards to the namenode?
How client application interacts with the NameNode?
What is 'Key value pair' in HDFS?
Why do we use HDFS for applications having large data sets and not when there are lot of small files?
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