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https://issues.apache.org/jira/browse/SOLR-2700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13147743#comment-13147743
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Yonik Seeley commented on SOLR-2700:
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bq. I meant this: http://wiki.apache.org/solr/UpdateXmlMessages#A.22rollback.22

Right - that's what I mean too (since all that really does is call Lucene's 
IW.rollback).
It's a low-level operation I'm not particularly fond of - to most clients, when 
a commit happened should be relatively arbitrary (esp when going into the world 
of NRT).
                
> transaction logging
> -------------------
>
>                 Key: SOLR-2700
>                 URL: https://issues.apache.org/jira/browse/SOLR-2700
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Yonik Seeley
>         Attachments: SOLR-2700.patch, SOLR-2700.patch, SOLR-2700.patch, 
> SOLR-2700.patch, SOLR-2700.patch, SOLR-2700.patch, SOLR-2700.patch
>
>
> A transaction log is needed for durability of updates, for a more performant 
> realtime-get, and for replaying updates to recovering peers.

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