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T Jake Luciani commented on CASSANDRA-1034: ------------------------------------------- @Sylvain This is all really confusing and I agree the core of the ticket is to make key->token 1:1 The core of the problem initially was explained in CASSANDRA-1733 bq. A Range object (which Hadoop splits generate) is start-exclusive. A Bounds object (which normal user scan queries generate) is start-inclusive. So by making Token the only way to deal with keys it feels like a more consistent api. Since Key can be null it needs to be Token that becomes the primary internal class. In your impl we now have DK, Token, RingPosition which too me is more confusing than having one Token class. > Remove assumption that Key to Token is one-to-one > ------------------------------------------------- > > Key: CASSANDRA-1034 > URL: https://issues.apache.org/jira/browse/CASSANDRA-1034 > Project: Cassandra > Issue Type: Bug > Reporter: Stu Hood > Assignee: Pavel Yaskevich > Priority: Minor > Fix For: 1.1 > > Attachments: > 0001-Make-range-accept-both-Token-and-DecoratedKey.patch, > 0002-LengthPartitioner.patch, 1034-1-Generify-AbstractBounds-v3.patch, > 1034-2-Remove-assumption-that-token-and-keys-are-one-to-one-v3.patch, > 1034_v1.txt, CASSANDRA-1034.patch > > > get_range_slices assumes that Tokens do not collide and converts a KeyRange > to an AbstractBounds. For RandomPartitioner, this assumption isn't safe, and > would lead to a very weird heisenberg. > Converting AbstractBounds to use a DecoratedKey would solve this, because the > byte[] key portion of the DecoratedKey can act as a tiebreaker. > Alternatively, we could make DecoratedKey extend Token, and then use > DecoratedKeys in places where collisions are unacceptable. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira