Sylvain Lebresne created CASSANDRA-5002:
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Summary: UUIGen should never use another host IP for its node part
Key: CASSANDRA-5002
URL: https://issues.apache.org/jira/browse/CASSANDRA-5002
Project: Cassandra
Issue Type: Bug
Reporter: Sylvain Lebresne
Assignee: Sylvain Lebresne
Priority: Minor
Fix For: 1.2.0
UUIDGen allows to specify the inet address that we use to generate the node
part of the created UUID. This is wrong however. More precisely, the node part
is what make sure UUID generated on two different hosts are different, because
we can't guarantee that the timestamp and clock parts will be different. In
other words, generating on a host a UUID with the node part of another host is
dangerous is clearly contrary to the spec.
And as it turns out, making sure we always use the local address means that the
full lsb part of the UUID becomes constant (as it should) and we can remove the
nodeCache from UUIDGen and simplify/speedup UUID generation, which is all the
more reason to fix it.
I note that we were almost always using the local address to generate UUID
anyway. The only place where we weren't is in Stream{In/Out}Session, and there
is virtually no chance that this has ever broke anything (but we should still
fix it).
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