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How data is organized to HDFS?

How data is organized to HDFS?

New Contributor

I'm coming from MapR world where there's a concept of creating volumes (logical entity) which allows to store and manage data in MapRFS (HDFS equivalent in MapR). I'm trying to understand how data is organized in HDFS? Is there any similar concept like "volumes" in HDFS? Also, how data retention is maintained in HDFS?

 

Thanks in advance.