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https://issues.apache.org/jira/browse/NUTCH-1538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13593223#comment-13593223
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lufeng commented on NUTCH-1538:
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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: https://issues.apache.org/jira/browse/NUTCH-1538
> 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
> (fetcher.store.content=true) you'll end up loading GBs of unused content
> during fetcherJob start-up.
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