What is a “Distributed Cache” in Apache Hadoop?
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What is safe mode in Hadoop?
Main Components of Hadoop?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
what should be the ideal replication factor in hadoop?
What is Rack awareness?
What is HDFS Block size? How is it different from traditional file system block size?
What are channel selectors?
Is hadoop based on google mapreduce?
How to configure hadoop to reuse JVM for mappers?
Is hadoop a memory?
Define fault tolerance?
Is hadoop obsolete?
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