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https://issues.apache.org/jira/browse/LUCENE-2840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979284#action_12979284
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Doron Cohen commented on LUCENE-2840:
-------------------------------------
Is it a possible that with this, searching a large optimized index (single
segment) might be slower than searching an un-optimzed index of the same size,
since the latter enjoys concurrency? If so, is it too wild for more than one
thread to handle that single segment?
> Multi-Threading in IndexSearcher (after removal of MultiSearcher and
> ParallelMultiSearcher)
> -------------------------------------------------------------------------------------------
>
> Key: LUCENE-2840
> URL: https://issues.apache.org/jira/browse/LUCENE-2840
> Project: Lucene - Java
> Issue Type: Sub-task
> Components: Search
> Reporter: Uwe Schindler
> Priority: Minor
> Fix For: 4.0
>
>
> Spin-off from parent issue:
> {quote}
> We should discuss about how many threads should be spawned. If you have an
> index with many segments, even small ones, I think only the larger segments
> should be separate threads, all others should be handled sequentially. So
> maybe add a maxThreads cound, then sort the IndexReaders by maxDoc and then
> only spawn maxThreads-1 threads for the bigger readers and then one
> additional thread for the rest?
> {quote}
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