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https://issues.apache.org/jira/browse/SOLR-670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Sekiguchi updated SOLR-670:
--------------------------------

    Attachment: SOLR-670.patch

A patch supports the rollback feature.

One question comes up. Is it worthy to have postRollback() method in 
SolrEventListener? Because SolrEventListener is an interface, if we add the 
method, it will break back-compat.

> UpdateHandler must provide a rollback feature
> ---------------------------------------------
>
>                 Key: SOLR-670
>                 URL: https://issues.apache.org/jira/browse/SOLR-670
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Noble Paul
>            Assignee: Shalin Shekhar Mangar
>             Fix For: 1.4
>
>         Attachments: SOLR-670.patch
>
>
> Lucene IndexWriter already has a rollback method. There should be a 
> counterpart for the same in _UpdateHandler_  so that users can do a rollback 
> over http 

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