[jira] [Commented] (MAHOUT-1225) Sets and maps incorrectly clear() their state arrays (potential endless loops)

["Robin Anil (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-1225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13672243#comment-13672243 ] 

Robin Anil commented on MAHOUT-1225:
------------------------------------

I am going to submit this for Dawid to close this. Excellent catch and even better testing.
                
> Sets and maps incorrectly clear() their state arrays (potential endless loops)
> ------------------------------------------------------------------------------
>
>                 Key: MAHOUT-1225
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1225
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>    Affects Versions: 0.7
>         Environment: Eclipse, linux Fedora 17, Java 1.7, Mahout Maths collections (Set) 0.7, hppc 0.4.3
>            Reporter: Sophie Sperner
>            Assignee: Dawid Weiss
>              Labels: hashset, java, mahout, test
>             Fix For: 0.7
>
>         Attachments: hppc-0.4.3.jar, MAHOUT-1225.patch, MAHOUT-1225.patch, MAHOUT-1225.patch, mahout-math-0.8-SNAPSHOT.jar
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> The code I attached hangs on forever, Eclipse does not print me its stack trace because it does not terminate the program. So I decided to make a small test.java file that you can easily run.
> This code has the main function that simply runs getItemList() method which successfully executes getDataset() method (here please download mushroom.dat dataset and set the full path into filePath string variable) and the hangs on (the problem happens on a fourth columnValues.add() call). After the dataset was taken into X array, the code simply goes through X column by column and searches for different items in it.
> If you uncomment IntSet columnValues = new IntOpenHashSet(); and corresponding import headers then everything will work just fine (you will also need to include hppc jar file found here http://labs.carrotsearch.com/hppc.html or below in the attachment).

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