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https://issues.apache.org/jira/browse/SOLR-11920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440445#comment-16440445
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Ishan Chattopadhyaya commented on SOLR-11920:
---------------------------------------------
This has not yet been released; this is slated for 7.4 release.
> Differential file copy for IndexFetcher
> ---------------------------------------
>
> Key: SOLR-11920
> URL: https://issues.apache.org/jira/browse/SOLR-11920
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Ishan Chattopadhyaya
> Assignee: Ishan Chattopadhyaya
> Priority: Major
> Attachments: SOLR-11920.patch, SOLR-11920.patch,
> thetaphi.Lucene.Solr.7.x.Linux.1675.log.txt.gz
>
>
> In the case of fullCopy=true, all files are copied over from the
> leader/master irrespective of whether or not that exact file exists with the
> replica/slave. This is wasteful, esp. in tlog replicas or pull replicas, when
> only a fraction of the total files are different.
> This stems from SOLR-11815.
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