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https://issues.apache.org/jira/browse/LUCENE-7671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15957388#comment-15957388
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Keith Laban commented on LUCENE-7671:
-------------------------------------
The test now passes using the CodeReader interface. I also renamed the class to
{{LiveUpgradeSegmentsMergePolicy}} because it upgrades on a segment by segment
basis verse the {{UpgradeIndexMergePolicy}} which tries to ugprade all
segments.
It looks like someone has been touching TestBackwardCompatibility class and
this no longer cleanly lands on master. I'll take a look at catching it up later
> 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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