Todd Lipcon created HDFS-3872:
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Summary: Store block ID in block metadata header
Key: HDFS-3872
URL: https://issues.apache.org/jira/browse/HDFS-3872
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Affects Versions: 3.0.0
Reporter: Todd Lipcon
We recently had an interesting local filesystem corruption in one cluster,
which caused a block and its associated metadata file to get replaced with a
data/meta pair from an entirely different replica. Because the block and its
metadata were still self-consistent, the block scanner never noticed, and we
ended up with a system where one replica differed from the others.
One simple solution to guard against this type of corruption in the future
would be to put the block ID itself in the meta header, and have the block
scanner verify it.
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