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https://issues.apache.org/jira/browse/SOLR-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14255034#comment-14255034
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Mark Miller commented on SOLR-4509:
-----------------------------------
One exception that pops up in some places it did not before is
NoHttpResponseException - after we have sent the full request and so we cannot
retry. It would appear that the stale check could usually detect this broken
connection before even sending the request and then get a new valid connection
before making the request. I've seen this exception even with the stale check,
so I think there is still a race, just like connection reset, but often, it
seems it can handle this.
> Disable HttpClient stale check for performance and fewer spurious connection
> errors.
> ------------------------------------------------------------------------------------
>
> 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, Trunk
>
> 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,
> 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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