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https://issues.apache.org/jira/browse/LUCENE-3736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202489#comment-13202489
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Michael McCandless commented on LUCENE-3736:
--------------------------------------------
I think the changes here are awesome too -- ParallelReader has been
badly unloved for a long time, so I'm very happy we are improving it
here.
But I don't think we need to have chained APIs to achieve that good
progress. Chained APIS are dangerous. We added chained APIs in
IndexWriterConfig and I think that was a mistake... it gave us lots of
not-so-readable code. We shouldn't encourage that and we shouldn't
add more.
> ParallelReader is now atomic, rename to ParallelAtomicReader and also add a
> ParallelCompositeReader (that requires LogDocMergePolicy to have identical
> subreader structure)
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3736
> URL: https://issues.apache.org/jira/browse/LUCENE-3736
> Project: Lucene - Java
> Issue Type: Sub-task
> Components: core/index
> Reporter: Uwe Schindler
> Fix For: 4.0
>
> Attachments: LUCENE-3733.patch, LUCENE-3736.patch, LUCENE-3736.patch,
> LUCENE-3736.patch
>
>
> The plan is:
> - Move all subreaders to ctor (builder-like API. First build reader-set, then
> call build)
> - Rename ParallelReader to ParallelAtomicReader
> - Add a ParallelCompositeReader with same builder API, but taking any
> CompositeReader-set and checks them that they are aligned (docStarts
> identical). The subreaders are ParallelAtomicReaders.
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