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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6936) Make all byte representations of types comparable by their unsigned byte representation only
Date Thu, 27 Mar 2014 17:09:24 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13949611#comment-13949611
] 

Aleksey Yeschenko commented on CASSANDRA-6936:
----------------------------------------------

bq. so that those that are fixed length, or only need a short length, or can otherwise encode
their length, can decide for themselves what size length to write.

Strictly speaking, we don't have any fixed-length types, because even a boolean column can
contain an empty value (empty BB passed via Thrift, for example). Not that it makes the larger
point invalid, just something to be aware of.

> Make all byte representations of types comparable by their unsigned byte representation
only
> --------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6936
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6936
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 3.0
>
>
> This could be a painful change, but is necessary for implementing a trie-based index,
and settling for less would be suboptimal; it also should make comparisons cheaper all-round,
and since comparison operations are pretty much the majority of C*'s business, this should
be easily felt (see CASSANDRA-6553 and CASSANDRA-6934 for an example of some minor changes
with major performance impacts). No copying/special casing/slicing should mean fewer opportunities
to introduce performance regressions as well.
> Since I have slated for 3.0 a lot of non-backwards-compatible sstable changes, hopefully
this shouldn't be too much more of a burden.



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