[jira] [Commented] (SOLR-6920) During replication use checksums to verify if files are the same

["Mark Miller (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-6920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309351#comment-14309351 ] 

Mark Miller commented on SOLR-6920:
-----------------------------------

[~varunthacker], can't we just calculate the checksum ourselves if we don't find it? So that we treat old segments right as well? This issue is critical for avoiding corrupted indexes on replication.

> 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
>         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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