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https://issues.apache.org/jira/browse/SOLR-11920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440401#comment-16440401
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Ishan Chattopadhyaya commented on SOLR-11920:
---------------------------------------------

I've pushed a fix for these failures (they were genuine code issues, not just 
test issues). I'll keep an eye out for further failures related to this and 
closed once I see none. Thanks [~steve_rowe].

> 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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