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https://issues.apache.org/jira/browse/SOLR-11920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440436#comment-16440436
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Shalin Shekhar Mangar commented on SOLR-11920:
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bq. I've pushed a fix for these failures (they were genuine code issues, not 
just test issues).

What exactly were the issues and how might they manifest in production? Since 
this went out in 7.3, can you ensure it is back-ported to branch_7_3 so that 
the fix makes it to the proposed 7.3.1?

> 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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