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https://issues.apache.org/jira/browse/SOLR-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13588657#comment-13588657
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Ryan Zezeski commented on SOLR-4509:
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> Would the 100ms latency you have described here show up in QTime values or be
> purely client-side?
So my latency measurements include end-to-end from client->yokozuna->solr
coordinator->shards->solr coordinator->yokozuna->client. I didn't track the
QTimes, but in benchmarks I ran months ago I saw the same results whether I
went through Yokozuna or hit Solr directly with the distributed search. I
could probably re-run to report QTime changes.
> I ask because the median (not average)...
I'm also reporting median latency, not mean. In my first link you can also
find graphs with 95th, 99th, 99.9 percentiles.
> ...an assumption of a server timeout of 50 milliseconds
The assumption is 50s, but yes, it is an assumption. A better patch would make
the idle timeout configurable as well as the period.
> If these are not actual worries, then I can be quiet.
No, these are great points. This patch, as it sits now, is for a specific
context. I did what I needed to do to improve my specific situation.
Honestly, I would like to see another person run this patch and verify at least
some amount of speed-up. Otherwise, it might best stay downstream.
> Disable Stale Check - Distributed Search (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
> Priority: Minor
> Attachments: SOLR-4509.patch
>
>
> 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.
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