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From "Lewis John McGibbney (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1352) Improve regex urlfilters/normalizers synchronization
Date Fri, 08 Jun 2012 14:07:23 GMT


Lewis John McGibbney commented on NUTCH-1352:

Markus feel free to commit this for trunk :)
> Improve regex urlfilters/normalizers synchronization
> ----------------------------------------------------
>                 Key: NUTCH-1352
>                 URL:
>             Project: Nutch
>          Issue Type: Improvement
>            Reporter: Ferdy Galema
>             Fix For: nutchgora, 1.6
>         Attachments: NUTCH-1352-1.6-1.patch, NUTCH-1352.patch
> I noticed that during fetching a lot of the time the fetcherthreads are blocking on a
monitor because of outlink normalizing/filtering. The cause of this: Some of the regex plugins
use single lock synchronization.
> This patch improves throughput by removing synchronization locks and replace them with
threadlocals were needed.
> It has been extensively tested in production. I will commit this later today when no

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