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From "Daniel Naber (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-442) TestIndexModifier.testIndexWithThreads is not valid?
Date Mon, 24 Oct 2005 20:56:56 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-442?page=comments#action_12355652 ] 

Daniel Naber commented on LUCENE-442:
-------------------------------------

I just committed some updates, could you please check whether it's okay now?

> TestIndexModifier.testIndexWithThreads is not valid?
> ----------------------------------------------------
>
>          Key: LUCENE-442
>          URL: http://issues.apache.org/jira/browse/LUCENE-442
>      Project: Lucene - Java
>         Type: Bug
>   Components: Search
>     Versions: 1.9
>     Reporter: Hoss Man

>
> I recently started playing with the trunk of SVN, and noticed that intermitently, TestIndexModifier.testIndexWithThreads
(revision 292010) would fail.
> The basic premise of the test seems to be that 3 pairs of IndexThread instances can be
started in parallel, each pair using the same instance of IndexModifier to concurrently and
randomly add/delete/optimize a single FSDirectory index.  
> The test is considered a success if the sum of additions-deletions recorded by each pair
of threads equals the final docCount() for the IndexModifier instance used by that pair of
threads.
> Now I freely admit that I'm not 100% familiar with the code for IndexModifier, but at
a glance, the basic premise seems to be: 
>    a) If method for IndexWriter is called, open it if needed, close the IndexReader first
if needed.
>    b) if method for IndexReader is called, open it if needed, close the IndexWriter first
if needed.
> If I'm understnading that correctly, I see no reason to assume this test will pass. 

> It seems like there could be plenty of scenerios in which the number of additions-deletions
!= docCount(). The most trivial example I can think of is:
>    1) the first IndexThread instance which has a chance to run adds a document, and optimizes
before any other IndexThreads ever open the Directory.
>    2) a subsequent pair of IndexThread instances open their IndexModifier instance before
any documents are deleted.
>    3) the IndexThread instances from #2 do nothing but add documents
> ...that pair of IndexThreads is now garunteed to have recorded a differnet number of
additions then the docCount returned by their IndexModifier.
> Am I missing something, or should this test be removed?

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