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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2015/02/25 10:44:04 UTC

[jira] [Commented] (LUCENE-6293) TimSort bug

    [ https://issues.apache.org/jira/browse/LUCENE-6293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14336300#comment-14336300 ] 

Adrien Grand commented on LUCENE-6293:
--------------------------------------

Given the description of the problem, I think we suffer from it too. However when I tried the test code with Lucene's ArrayUtil.timSort instead of Java's Arrays.sort I could not reproduce the problem. I suspect this is due to some differences in implementation details... I'll try to dig more.

> TimSort bug
> -----------
>
>                 Key: LUCENE-6293
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6293
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>
> Robert pointed me to http://envisage-project.eu/proving-android-java-and-python-sorting-algorithm-is-broken-and-how-to-fix-it/ yesterday which explains how most implementations of TimSort are broken. We should check our TimSorter.



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