o.a.c.dht.Range.differenceToFetch() doesn't handle all cases correctly
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Key: CASSANDRA-3084
URL: https://issues.apache.org/jira/browse/CASSANDRA-3084
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 0.8.4
Reporter: Tyler Hobbs
It's possible that differenceToFetch is making implicit assumptions about the
relationship between the two ranges, but the following cases are not handled
correctly (the old range is (A, B], the new is (C, D]:
{noformat}
--C--A-----B--D--
{noformat}
Here, the result will be (C, A] and (D, B], instead of (C, A] and (B, D].
{noformat}
--C--A-----D--B--
{noformat}
The result will be (C, D] instead of just (C, A].
{noformat}
--A--C-----D--B--
{noformat}
The result will be (B, D] when nothing needs to be transfered.
If there is some kind of implicit assumption that these cases won't arise, it
either needs to be explicit (assertions, exceptions) or the cases need to be
handled. It should be easy to cover this with unit tests.
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