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https://issues.apache.org/jira/browse/MAHOUT-1225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665248#comment-13665248
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Sophie Sperner commented on MAHOUT-1225:
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Dear, I go to http://repo1.maven.org/maven2/org/apache/mahout/mahout-math/0.7/ 
and download mahout-math-0.7.jar . Does it contain lots of bugs? What is the 
newest version? If you point me to github then I do not know how to make a jar 
file out of source. Could you please tell how to get most recent and stable 
code? I apologise if said bad words about old version.
                
> 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, mushroom.dat
>
>   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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