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Why hadoop default replication factor of datanode is 3?

As of my knowledge Hadoop default replication factor of data node is 3 not more or less than this. can anybody explain me why Hadoop consider as 3 only?

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The base concept of hadoop replication factor is 3 is:

1: The 1st replication is always used for write operation
2: The 2nd replication factor always consider as backup for disaster recover.
3: The 3rd replication is always used for high throughput on read operation where the 1st node is busy with write operation.

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