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https://issues.apache.org/jira/browse/CASSANDRA-7107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13984221#comment-13984221
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Benedict commented on CASSANDRA-7107:
-------------------------------------
Whilst the main point of this is to tidy up, I also find a roughly 15-20%
performance bump for the following stress command:
bq. cassandra-stress read n=10000000 -key populate=1..100 -col slice
n=fixed\(1000\) size=fixed\(1\) -rate threads=50 -mode thrift
I've pushed the changes
[here|https://github.com/belliottsmith/cassandra/tree/7107]
> General minor tidying of CollationController path
> -------------------------------------------------
>
> Key: CASSANDRA-7107
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7107
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Benedict
> Assignee: Benedict
> Priority: Minor
> Fix For: 2.1.0
>
>
> There is a lot of unnecessary boiler plate when grabbing an iterator from an
> in-memory column family. This patch:
> * Removes FakeCellName
> * Avoids wrapping a non-OnDiskAtomIterator as an OnDiskAtomIterator except
> when the wrapping is useful
> * Removes ColumnSlice.NavigableSetIterator and creates a simpler more direct
> equivalent in ABTC
> * Does not construct a SliceIterator in either ABSC or ABTC if only one slice
> is requested (just returns that slice as an Iterator)
> * Does not construct multiple list indirections in ABSC when constructing a
> slice
> * Shares forward/reverse iterators in ABSC between slices and full-iteration
> * Avoids O(N) comparisons during collation of results into an ABSC, by using
> the knowledge that all columns are provided in insertion order from a merge
> iterator
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