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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-2062) Use more efficient merge algorithm
Date Thu, 27 Jan 2011 09:05:43 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stu Hood updated CASSANDRA-2062:
--------------------------------

    Attachment: 0003-Replace-Collating-with-Merge-in-CompactionIterator.txt
                0002-Quickie-instrumentation-for-comparisons.txt
                0001-Improved-iterator-for-merging-sorted-iterators.txt

> 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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