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https://issues.apache.org/jira/browse/MAHOUT-1560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Schelter resolved MAHOUT-1560.
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Resolution: Fixed
Fix Version/s: 1.0
Assignee: Sebastian Schelter
committed, thank you for the contribution
> Last batch is not filled correctly in MultithreadedBatchItemSimilarities
> ------------------------------------------------------------------------
>
> Key: MAHOUT-1560
> URL: https://issues.apache.org/jira/browse/MAHOUT-1560
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.9
> Reporter: Jarosław Bojar
> Assignee: Sebastian Schelter
> Priority: Minor
> Fix For: 1.0
>
> Attachments: Corrected_last_batch_size_calculation.patch,
> MultithreadedBatchItemSimilaritiesTest.patch
>
>
> In {{MultithreadedBatchItemSimilarities}} method {{queueItemIDsInBatches}}
> handles last batch incorrectly. Last batch length is calculated incorrectly.
> As a result last batch is either truncated or too long with superfluous
> positions filled with item indexes from previous batch (or zeros if it is
> also the first batch as in attached test).
> Attached test fails for very short model (with only 4 items) with
> NoSuchItemException.
> Attached patch corrects this issue.
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