Hello,
HDFS Missing Blocks / Corrupt Blocks Logic: What are the specific
checks done to determine a block is bad and needs to be replicated?
Does HDFS check that the data node is up, data disk is mounted, path to
the file exists and file can be read?
Or does it also do a filesystem check on that data disk as well as
perhaps a checksum to ensure block integrity?
I've googled on this quite a bit. I don't see the exact answer I'm
looking for. I would like to know exactly what happens during file
integrity verification that then constitutes missing blocks or corrupt
blocks in the reports.
--
Thank You,
TK.
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