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https://issues.apache.org/jira/browse/LUCENE-2041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786932#action_12786932
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Israel Tsadok commented on LUCENE-2041:
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This has turned into a complete refactoring of the class, but I'd like to
comment that the original intent of this patch was a bit misguided: docFreq()
is not called during normal use of ParallelMultiSearcher. What does get called
is docFreqs() on the sub-searchers. This is done in
MultiSearcher.createWeight(), and is done sequentially.
I created issue LUCENE-2128 to suggest a solution to this.
> Complete parallelizaton of ParallelMultiSearcher
> ------------------------------------------------
>
> Key: LUCENE-2041
> URL: https://issues.apache.org/jira/browse/LUCENE-2041
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 2.9
> Reporter: Joey Surls
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 3.0
>
> Attachments: LUCENE-2041-final.patch, LUCENE-2041-refactor.patch,
> LUCENE-2041-refactor.patch, LUCENE-2041.patch, LUCENE-2041.patch,
> LUCENE-2041.patch, LUCENE-2041.patch, LUCENE-2041.patch, LUCENE_2041.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> ParallelMultiSearcher is parallel only for the method signatures of 'search'.
> Part of a query process calls the method docFreq(). There was a TODO comment
> to parallelize this. Parallelizing this method actually increases the
> performance of a query on multiple indexes, especially remotely.
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