[jira] Updated: (NUTCH-395) Increase fetching speed

["Sami Siren (JIRA)" <ji...@apache.org>]

     [ http://issues.apache.org/jira/browse/NUTCH-395?page=all ]

Sami Siren updated NUTCH-395:
-----------------------------

    Attachment: nutch-0.8-performance.txt

a rough patch for testing purposes

> Increase fetching speed
> -----------------------
>
>                 Key: NUTCH-395
>                 URL: http://issues.apache.org/jira/browse/NUTCH-395
>             Project: Nutch
>          Issue Type: Improvement
>          Components: fetcher
>    Affects Versions: 0.8.1
>            Reporter: Sami Siren
>         Assigned To: Sami Siren
>         Attachments: nutch-0.8-performance.txt
>
>
> There have been some discussion on nutch mailing lists about fetcher being slow, this patch tried to address that. the patch is just a quich hack and needs some cleaning up, it also currently applies to 0.8 branch and not trunk and it has also not been tested in large. What it changes?
> Metadata - the original metadata uses spellchecking, new version does not (a decorator is provided that can do it and it should perhaps be used where http headers are handled but in most of the cases the functionality is not required)
> Reading/writing various data structures - patch tries to do io more efficiently see the patch for details.
> Initial benchmark:
> A small benchmark was done to measure the performance of changes with a script that basically does the following:
> -inject a list of urls into a fresh crawldb
> -create fetchlist (10k urls pointing to local filesystem)
> -fetch
> -updatedb
> original code from 0.8-branch:
> real    10m51.907s
> user    10m9.914s
> sys     0m21.285s
> after applying the patch
> real    4m15.313s
> user    3m42.598s
> sys     0m18.485s

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