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Q:
What do you know about Block and Block scanner in HDFS?

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A large file in HDFS is broken into multiple parts and each part is stored on a different Block. By default a Block is of 64 MB capacity in HDFS.

Block Scanner is a program that every Data node in HDFS runs periodically to verify the checksum of every block stored on the data node.

 

The purpose of a Block Scanner is to detect any data corruption errors on Data node.

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