Consistency of different replicas of the same block is not checked.
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Key: HADOOP-5074
URL: https://issues.apache.org/jira/browse/HADOOP-5074
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.14.0
Reporter: Konstantin Shvachko
HDFS currently detects corrupted replicas by verifying that its contents
matches the checksum stored in the block meta-file. This is done independently
for each replica of the block on the data-node it belongs to. But we do not
check that the replicas are identical across data-nodes as long as they have
the same size.
This is not common but can happen as a result of a software bug or an operator
mismanagement. And in this case different clients will read different data from
the same file.
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