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https://issues.apache.org/jira/browse/SOLR-8586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15132725#comment-15132725
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Yonik Seeley commented on SOLR-8586:
------------------------------------

Yep, I've been looping a custom version of the HDFS-nothing-safe test that 
among other things, only does adds, no deletes.  It's the same test I've been 
using all along in SOLR-8129 .  I've gotten 66 fails (most due to mismatch with 
control), but no fails due to shards being out of sync!

I plan on committing this soon.

> Implement hash over all documents to check for shard synchronization
> --------------------------------------------------------------------
>
>                 Key: SOLR-8586
>                 URL: https://issues.apache.org/jira/browse/SOLR-8586
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Yonik Seeley
>         Attachments: SOLR-8586.patch, SOLR-8586.patch, SOLR-8586.patch, 
> SOLR-8586.patch
>
>
> An order-independent hash across all of the versions in the index should 
> suffice.  The hash itself is pretty easy, but we need to figure out 
> when/where to do this check (for example, I think PeerSync is currently used 
> in multiple contexts and this check would perhaps not be appropriate for all 
> PeerSync calls?)



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