Question: In a Hadoop cluster, when data is corrupted in one of the memory blocks in HDFS , how does the algorithm recover from the potential

In a Hadoop cluster, when data is corrupted in one of the memory blocks in HDFS, how does the algorithm recover from the potential failure?
By changing the namenode at client level
The algorithm regenerates the lost data from remining data
Ogets the lost data from another uncorrupted copy elsewhere in the system
It is lost forever

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