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https://issues.apache.org/jira/browse/LUCENE-8049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16266357#comment-16266357
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ASF subversion and git services commented on LUCENE-8049:
---------------------------------------------------------

Commit 4e154cf85df55c8a063e93439377478aa967d99e in lucene-solr's branch 
refs/heads/branch_7x from [~dsmiley]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=4e154cf ]

LUCENE-8049: IndexWriter.getMergingSegments() signature changed to return Set 
instead of Collection

(cherry picked from commit 64d95e6)


> IndexWriter.getMergingSegments should return a Set, not Collection
> ------------------------------------------------------------------
>
>                 Key: LUCENE-8049
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8049
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: David Smiley
>            Assignee: David Smiley
>            Priority: Minor
>         Attachments: LUCENE_8049.patch
>
>
> IndexWriter.getMergingSegments is called by the MergePolicy so that it can 
> filter out segments to merge using mergingSegments.contains(seg).  The 
> implementation is a HashSet, thankfully but the declared type of this method 
> ought to be defined as a Set as well.



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