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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-3054) SorterTemplate.quickSort stack overflows on broken comparators that produce only few disticnt values in large arrays
Date Tue, 03 May 2011 13:21:03 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3054?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler resolved LUCENE-3054.
-----------------------------------

    Resolution: Fixed

Committed trunk revision: 1099041
Merged 3.x revision: 1099045
Merged 3.1 revision: 1099046

> SorterTemplate.quickSort stack overflows on broken comparators that produce only few
disticnt values in large arrays
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3054
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3054
>             Project: Lucene - Java
>          Issue Type: Task
>    Affects Versions: 3.1
>            Reporter: Robert Muir
>            Assignee: Uwe Schindler
>            Priority: Critical
>             Fix For: 3.1.1, 3.2, 4.0
>
>         Attachments: LUCENE-3054-dynamic.patch, LUCENE-3054-stackoverflow.patch, LUCENE-3054.patch,
LUCENE-3054.patch, LUCENE-3054.patch, LUCENE-3054.patch, LUCENE-3054.patch, LUCENE-3054.patch
>
>
> Looking at Otis's sort problem on the mailing list, he said:
> {noformat}
> * looked for other places where this call is made - found it in
> MultiPhraseQuery$MultiPhraseWeight and changed that call from
> ArrayUtil.quickSort to ArrayUtil.mergeSort
> * now we no longer see SorterTemplate.quickSort in deep recursion when we do a
> thread dump
> {noformat}
> I thought this was interesting because PostingsAndFreq's comparator
> looks like it needs a tiebreaker.
> I think in our sorts we should add some asserts to try to catch some of these broken
comparators.

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