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https://issues.apache.org/jira/browse/SOLR-2700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099187#comment-13099187
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Yonik Seeley commented on SOLR-2700:
------------------------------------

bq. I'm not sure how this feature makes any sense, the documents are already 
being serialized to disk, eg, to the docstore by StoredFieldsWriter.

If the only use for a transaction log were realtime-get, I would agree.  But we 
have many more uses planned, so this is just a stepping stone (and a nice 
little feature along the way) to where we are going.

> 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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