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https://issues.apache.org/jira/browse/SOLR-3622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414939#comment-13414939
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Yonik Seeley commented on SOLR-3622:
------------------------------------

bq. Should the rollback feature be removed in favor of something more 
cloud-friendly?

No.  Some people do want it (same with the prepare).  The uses are pretty 
special though, when you bave complete control of all updates going to Solr and 
you know exactly when commits happen, etc.

In general, one should use something like deleteByQuery to remove a bunch of 
added updates (however that only works if the documents added are new and did 
not overwrite any older ones).  Real transaction isolation is not a target 
feature for Solr.
                
> DIH should not do rollbacks.
> ----------------------------
>
>                 Key: SOLR-3622
>                 URL: https://issues.apache.org/jira/browse/SOLR-3622
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.0, 5.0
>
>
> This is not playing nice.

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