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https://issues.apache.org/jira/browse/LUCENE-8330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489729#comment-16489729
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David Smiley commented on LUCENE-8330:
--------------------------------------
BTW LUCENE-8331 shows how the MergePolicy can be tested or simulated without
actual indexing today without changes to any APIs either. Though it's a little
hacky so I think the changes proposed here in LUCENE-8330 are a welcome
addition!
> Detach IndexWriter from MergePolicy
> -----------------------------------
>
> Key: LUCENE-8330
> URL: https://issues.apache.org/jira/browse/LUCENE-8330
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.4, master (8.0)
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: LUCENE-8330.patch, LUCENE-8330.patch, LUCENE-8330.patch,
> LUCENE-8330.patch
>
>
> This change introduces a new MergePolicy.MergeContext interface
> that is easy to mock and cuts over all instances of IW to MergeContext.
> Since IW now implements MergeContext the cut over is straight forward.
> This reduces the exposed API available in MP dramatically and allows
> efficient testing without relying on IW to improve the coverage and
> testability of our MP implementations.
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