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From "Ryan Zezeski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4509) Disable Stale Check - Distributed Search (Performance)
Date Wed, 27 Feb 2013 21:31:14 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13588787#comment-13588787
] 

Ryan Zezeski commented on SOLR-4509:
------------------------------------

> ...i'll be testing this in the next few days.

Great, I would love to see these results reproduced by someone else.

> I'm not very sure enabling TCP_NODELAY (e.g. disable Nagle's algorithm) will help a lot

I agree, it probably doesn't matter but I disabled it anyways given that nagle is really meant
for things like telnet and such.  I figured it couldn't hurt to disable.


                
> 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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