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https://issues.apache.org/jira/browse/SOLR-3154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637679#comment-13637679
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Mark Miller commented on SOLR-3154:
-----------------------------------

A kind of easy win was taken in SOLR-3710 where we started just sending to 
leaders first (though not necessarily the right leader) - still need to do this 
and have the cloudsolrserver hash as well though.
                
> SolrJ CloudServer should be leader and network aware when adding docs
> ---------------------------------------------------------------------
>
>                 Key: SOLR-3154
>                 URL: https://issues.apache.org/jira/browse/SOLR-3154
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>    Affects Versions: 4.0-ALPHA
>            Reporter: Grant Ingersoll
>            Assignee: Mark Miller
>            Priority: Minor
>             Fix For: 4.3
>
>         Attachments: SOLR-3154.patch
>
>
> It would be good when indexing if the SolrJ CloudServer was leader aware so 
> that we could avoid doing an extra hop for the data.  It would also be good 
> if one could easily set things up based on data locality principles.  This 
> might mean that CloudServer is aware of where on the network it is and would 
> pick leaders that are as close as possible (i.e. local, perhaps.)  This would 
> come in to play when working with tools like Hadoop or other grid computing 
> frameworks.

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