Add sanity check during image/edit loading that blocks aren't doubly referenced
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Key: HDFS-2873
URL: https://issues.apache.org/jira/browse/HDFS-2873
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: Todd Lipcon
We recently had an incident where an invalid image was accidentally fed into a
NN. This image had property that multiple inodes referred to the same set of
blocks -- as if there were hard links, but without any reference counting
mechanisms. The NN happily loaded this, but of course it later caused problems
when one of the inodes was deleted. We should be able to add a sanity check
when replaying OP_ADD that, if the blocks already exist in the system, they are
referenced by the same inode in that OP_ADD.
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