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https://issues.apache.org/jira/browse/SOLR-1044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679466#action_12679466
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Mike Klaas commented on SOLR-1044:
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{quote} I haven't yet seen a HTTP server serving more than around 1200 req/sec 
(apache HTTPD). A call based server can serve 4k-5k  messages  easily. (I am 
yet to test hadoop RPC) . The proliferation of a large no: of frameworks around 
that is a testimony to the superiority of that approach. {/quote}

up to 50,000 req/sec, with keepalive: 
http://www.litespeedtech.com/web-server-performance-comparison-litespeed-2.0-vs.html

> 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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