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https://issues.apache.org/jira/browse/CASSANDRA-2062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stu Hood updated CASSANDRA-2062:
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Description: For {{M}} iterators containing {{N}} total items,
commons.collections.CollatingIterator performs a {{O(M*N)}} merge, and calls
hasNext multiple times per returned value. We can do better. (was: For {{M}}
iterators containing {{N}} total items, commons.collections.CollatingIterator
performs a {{M*O(N)}} merge, and calls hasNext multiple times per returned
value. We can do better.)
> Use more efficient merge algorithm
> ----------------------------------
>
> Key: CASSANDRA-2062
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2062
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Stu Hood
> Priority: Minor
> Fix For: 0.7.2
>
> Attachments: 0001-Improved-iterator-for-merging-sorted-iterators.txt,
> 0002-Quickie-instrumentation-for-comparisons.txt,
> 0003-Replace-Collating-with-Merge-in-CompactionIterator.txt
>
>
> For {{M}} iterators containing {{N}} total items,
> commons.collections.CollatingIterator performs a {{O(M*N)}} merge, and calls
> hasNext multiple times per returned value. We can do better.
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