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https://issues.apache.org/jira/browse/LUCENE-7671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925030#comment-15925030
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Keith Laban commented on LUCENE-7671:
-------------------------------------
Because i've added some {{oldSingleSegmentNames}} with this commit,
{{TestBackwardsCompatibility.testUpgradeOldSingleSegmentIndexWithAdditions}}
now fails after rebasing LUCENE-7703 because of this line
https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/index/IndexWriter.java#L2657
Prior to this commit this effectively does nothing as there were no old single
segment files. This failure should be addressed outside the scope of this
ticket.
> Enhance UpgradeIndexMergePolicy with additional options
> -------------------------------------------------------
>
> Key: LUCENE-7671
> URL: https://issues.apache.org/jira/browse/LUCENE-7671
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Keith Laban
>
> Enhance UpgradeIndexMergePolicy to be a MergePolicy that can be used outside
> the scope the IndexUpgrader.
> The enhancement aims to allow the UpgradeIndexMergePolicy to:
> 1) Delegate normal force merges to the underlying merge policy
> 2) Enable a flag that will explicitly tell UpgradeIndexMergePolicy when it
> should start looking for upgrades.
> 3) Allow new segments to be considered to be merged with old segments,
> depending on underlying MergePolicy.
> 4) Be configurable for backwards compatibility such that only segments
> needing an upgrade would be considered when merging, no explicit upgrades.
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