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https://issues.apache.org/jira/browse/NUTCH-1352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269619#comment-13269619
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Ferdy Galema commented on NUTCH-1352:
-------------------------------------
Thanks.
> Improve regex urlfilters/normalizers synchronization
> ----------------------------------------------------
>
> Key: NUTCH-1352
> URL: https://issues.apache.org/jira/browse/NUTCH-1352
> 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 objection.
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