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https://issues.apache.org/jira/browse/SOLR-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15200999#comment-15200999
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Mark Miller commented on SOLR-4509:
-----------------------------------

Actually this snuck in even before SSL, it was added in 4.0.  It was quietly 
added, but internal features did not count on it or use it. SSL only used it 
for test purposes later on. Security has bear hugged it though - it's how you 
configure security now and is part of a user plugin api. Bummer given the old 
deprecated HttpClient classes involved and the extra pain to move to 
preconfiguration. We should try and minimize exposing internal client API's as 
part of our API's to users. It really locks us in.

> Disable HttpClient stale check for performance.
> -----------------------------------------------
>
>                 Key: SOLR-4509
>                 URL: https://issues.apache.org/jira/browse/SOLR-4509
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>         Environment: 5 node SmartOS cluster (all nodes living in same global 
> zone - i.e. same physical machine)
>            Reporter: Ryan Zezeski
>            Assignee: Mark Miller
>            Priority: Minor
>             Fix For: 5.0, master
>
>         Attachments: IsStaleTime.java, SOLR-4509-4_4_0.patch, 
> SOLR-4509.patch, SOLR-4509.patch, SOLR-4509.patch, SOLR-4509.patch, 
> SOLR-4509.patch, SOLR-4509.patch, SOLR-4509.patch, SOLR-4509.patch, 
> SOLR-4509.patch, baremetal-stale-nostale-med-latency.dat, 
> baremetal-stale-nostale-med-latency.svg, 
> baremetal-stale-nostale-throughput.dat, baremetal-stale-nostale-throughput.svg
>
>
> By disabling the Apache HTTP Client stale check I've witnessed a 2-4x 
> increase in throughput and reduction of over 100ms.  This patch was made in 
> the context of a project I'm leading, called Yokozuna, which relies on 
> distributed search.
> Here's the patch on Yokozuna: https://github.com/rzezeski/yokozuna/pull/26
> Here's a write-up I did on my findings: 
> http://www.zinascii.com/2013/solr-distributed-search-and-the-stale-check.html
> I'm happy to answer any questions or make changes to the patch to make it 
> acceptable.
> ReviewBoard: https://reviews.apache.org/r/28393/



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