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From "lufeng (JIRA)" <>
Subject [jira] [Issue Comment Deleted] (NUTCH-1538) tuning of loaded fields during fetcherJob start-up
Date Tue, 05 Mar 2013 08:26:12 GMT


lufeng updated NUTCH-1538:

    Comment: was deleted

(was: Hi Roland,

Maybe we can add a QueryFieldFilter to remove some field that never used in fetch if fetcher.parse
proerpty is true.)
> tuning of loaded fields during fetcherJob start-up
> --------------------------------------------------
>                 Key: NUTCH-1538
>                 URL:
>             Project: Nutch
>          Issue Type: Improvement
>          Components: fetcher
>    Affects Versions: 2.1
>         Environment: nutch 2.1 / cassandra 1.2.1 / gora-cassandra 0.2 / gora-core 0.2.1

> running fetch with parse=true
>            Reporter: Roland
> Main problem is, nutch is loading nearly every row & column from DB during startup
of a fetcherJob when fetcher.parse=true.
> A parserJob needs e.g. the CONTENT field from db, to parse.
> The fetcherJob adds all fields of the parserJob to it's needed fields, if running with
fetcher.parse=true. [FetcherJob.getFields()]
> If the nutch configuration saves all fetched data to DB (
you'll end up loading GBs of unused content during fetcherJob start-up.

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