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


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:
>             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:
> Here's a write-up I did on my findings:
> I'm happy to answer any questions or make changes to the patch to make it acceptable.

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