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https://issues.apache.org/jira/browse/MAHOUT-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Filimon resolved MAHOUT-1180.
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Resolution: Fixed
Fix Version/s: 0.8
Committed revision 1478723.
> Multinomial<T> throws ConcurrentModificationException when iterating and
> setting probabilities
> ----------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1180
> URL: https://issues.apache.org/jira/browse/MAHOUT-1180
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Dan Filimon
> Priority: Minor
> Fix For: 0.8
>
> Attachments: MAHOUT_1180.patch, MAHOUT_1180.patch
>
>
> Here's [1] an example of the problem (from BallKMeans, lines 225-232, [2]).
> When iterating through the elements in a Multinomial and updating the
> probabilities, sometimes newWeight becomes 0 (because of using
> CosineDistances).
> When setting a weight to 0 in Multinomial, the element is removed from the
> items hash map while using the hash map for iteration.
> This causes a ConcurrentModificationException.
> [1] https://gist.github.com/dfilimon/5270234
> [2]
> https://github.com/dfilimon/mahout/blob/skm/core/src/main/java/org/apache/mahout/clustering/streaming/cluster/BallKMeans.java#L225
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