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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8330) Detach IndexWriter from MergePolicy
Date Thu, 24 May 2018 20:21:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489729#comment-16489729
] 

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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