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https://issues.apache.org/jira/browse/MAHOUT-881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149130#comment-13149130
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Yonik Seeley commented on MAHOUT-881:
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One last note: *if* the number of competitive entries is ever expected to be
high (as is the case with the lucene example I gave above) then you can still
cap the number of GenericRecommendedItem objects created by making them
mutable. Then on a competitive entry and a full PQ, you modify the bottom
entry and call adjustTop() instead of creating a new entry.
> Refactor TopItems to use Lucene's PriorityQueue and remove excessive sorting
> ----------------------------------------------------------------------------
>
> Key: MAHOUT-881
> URL: https://issues.apache.org/jira/browse/MAHOUT-881
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.6
> Reporter: Grant Ingersoll
> Assignee: Grant Ingersoll
> Priority: Minor
> Attachments: MAHOUT-881.patch
>
>
> TopItems.getTop*() all do a fair number of excessive operations that can be
> replaced by switching to using Lucene's PriorityQueue implementation, which
> is more efficient and faster than Java's built in PQ implementation.
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