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What happens when the block scanner detects a corrupt data block?

Answer»

The following STEPS occur when the block scanner detects a corrupt data block:

  • First and FOREMOST, when the Block Scanner detects a CORRUPTED data block, DataNode notifies NameNode.
  • NameNode begins the process of constructing a new replica from a corrupted block replica.
  • The replication factor is compared to the replication COUNT of the right replicas. The faulty data block will not be REMOVED if a match is detected.


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