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https://issues.apache.org/jira/browse/SOLR-1044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678601#action_12678601
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Walter Underwood commented on SOLR-1044:
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During the Oscars, the HTTP cache in front of our Solr farm had a 90% hit rate. 
I think a 10X reduction in server load is a testimony to the superiority of the 
HTTP approach.


> Use Hadoop RPC for inter Solr communication
> -------------------------------------------
>
>                 Key: SOLR-1044
>                 URL: https://issues.apache.org/jira/browse/SOLR-1044
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Noble Paul
>
> Solr uses http for distributed search . We can make it a whole lot faster if 
> we use an RPC mechanism which is more lightweight/efficient. 
> Hadoop RPC looks like a good candidate for this.  
> The implementation should just have one protocol. It should follow the Solr's 
> idiom of making remote calls . A uri + params +[optional stream(s)] . The 
> response can be a stream of bytes.
> To make this work we must make the SolrServer implementation pluggable in 
> distributed search. Users should be able to choose between the current 
> CommonshttpSolrServer, or a HadoopRpcSolrServer . 

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