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HDFS Snapshot take full backup or incremental backup

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The snapshot feature we have in Cloudera, i would like to know if it take a full backup or incremental backup.

 

Because if it is taking a full backup everytime then there is a drawback to it as for an example i make changes and add a 2MB data to my 1000GB file then it will again take a backup of entire 1000GB file and not just a 2MB changes i made.

 

Would request someone to answer on above query.

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