Explain the hadoop configuration files at present?
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what is the default replication factor in HDFS?
Explain the shuffle?
What is a Secondary Namenode? Is it a substitute to the Namenode?
How we can take Hadoop out of Safe Mode?
What is a heartbeat in HDFS?
Is hadoop open source?
How to configure hadoop to reuse JVM for mappers?
What is compute and Storage nodes?
What is oozie in hadoop?
On what basis Namenode will decide which datanode to write on?
What is yarn in hadoop?
On what basis name node distribute blocks across the data nodes?
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