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https://issues.apache.org/jira/browse/SOLR-6920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309393#comment-14309393
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Varun Thacker commented on SOLR-6920:
-------------------------------------

bq. I guess it would be fairly expensive for large files. For critical small 
files (the ones that always seem to come as the problem), perhaps we can do the 
checksum ourselves, or more likely, just always down .si and segments_n files 
regardless.

Nice idea! So .si/segments_n/.liv should be downloaded again regardless. 



> During replication use checksums to verify if files are the same
> ----------------------------------------------------------------
>
>                 Key: SOLR-6920
>                 URL: https://issues.apache.org/jira/browse/SOLR-6920
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java)
>            Reporter: Varun Thacker
>            Priority: Critical
>         Attachments: SOLR-6920.patch, SOLR-6920.patch, SOLR-6920.patch
>
>
> Currently we check if an index file on the master and slave is the same by 
> checking if it's name and file length match. 
> With LUCENE-2446 we now have a checksums for each index file in the segment. 
> We should leverage this to verify if two files are the same.
> Places like SnapPuller.isIndexStale and SnapPuller.downloadIndexFiles should 
> check against the checksum also.



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