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https://issues.apache.org/jira/browse/MAHOUT-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13623885#comment-13623885
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Jake Mannix commented on MAHOUT-1186:
-------------------------------------
Thanks for catching this, Andy. Slipped by the unit test because we were a)
only checking size() == 0, and b) this only happens if the item added happens
to land in the last bucket of the backing array. Sneaky!
> OpenKeyTypeObjectHashMap#clear() has been broken forever.
> ---------------------------------------------------------
>
> Key: MAHOUT-1186
> URL: https://issues.apache.org/jira/browse/MAHOUT-1186
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.3, collections-1.0
> Reporter: Andy Schlaikjer
> Assignee: Jake Mannix
> Fix For: 0.8
>
> Attachments: MAHOUT-1186.diff
>
>
> Arrays.clear(array, 0, array.length - 1, FREE);
> Means that the last entry in the array is *not* FREE, and hence arrays.clear
> only *sometimes* empties the array, and hence only *sometimes* clears out all
> of the entries in the map. Other times, it leaves one element behind. :(
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