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From "Alex Petrov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6936) Make all byte representations of types comparable by their unsigned byte representation only
Date Tue, 10 Oct 2017 08:40:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198353#comment-16198353
] 

Alex Petrov commented on CASSANDRA-6936:
----------------------------------------

Nick Dimiduk also worked on byte-ordered types in HBase: [HBASE-8201|https://issues.apache.org/jira/browse/HBASE-8201]
and [OrderedBytes|https://github.com/apache/hbase/blob/master/hbase-common/src/main/java/org/apache/hadoop/hbase/util/OrderedBytes.java].

> 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
>            Reporter: Benedict
>            Assignee: Branimir Lambov
>              Labels: compaction, performance
>             Fix For: 4.x
>
>
> 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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