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https://issues.apache.org/jira/browse/SOLR-4733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673716#comment-13673716
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Mark Miller commented on SOLR-4733:
-----------------------------------

Yeah, fair enough - when I see stuff around tlog and optimistic concurrency, I 
think SolrCloud. And I think some of the reasons SolrCloud does not support 
rollback involves the transaction log and optimistic concurrency and these 
types of things - so the challanges may extend to single node instances when 
using these features.

[[email protected]] ?
                
> Rollback does not work correctly with tlog and optimistic concurrency updates
> -----------------------------------------------------------------------------
>
>                 Key: SOLR-4733
>                 URL: https://issues.apache.org/jira/browse/SOLR-4733
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.3, 4.2.1
>         Environment: Ubuntu 12.04.2 LTS
>            Reporter: Mark S
>              Labels: solrj
>         Attachments: SOLR-4733.patch
>
>
> When using the updateLog, attempting to rollback atomic updates still causes 
> post-rollback atomic updates to still report a conflict with the version 
> assigned to the update posted prior to the rollback

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