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Posted to dev@nutch.apache.org by "Enrico Triolo (JIRA)" <ji...@apache.org> on 2006/07/20 11:50:14 UTC
[jira] Commented: (NUTCH-322) Fetcher discards ProtocolStatus,
doesn't store redirected pages
[ http://issues.apache.org/jira/browse/NUTCH-322?page=comments#action_12422379 ]
Enrico Triolo commented on NUTCH-322:
-------------------------------------
I'm not at all sure about the fact that fetcher doesn't store redirected pages. In my experience, redirected pages are fetched, and the crawldb is updated too.
Anyway I agree with you that the ProtocolStatus should be stored inside CrawlDatum, and I furthermore propose that it should contain the original url in case of redirection.
> Fetcher discards ProtocolStatus, doesn't store redirected pages
> ---------------------------------------------------------------
>
> Key: NUTCH-322
> URL: http://issues.apache.org/jira/browse/NUTCH-322
> Project: Nutch
> Issue Type: Bug
> Components: fetcher
> Affects Versions: 0.8-dev
> Reporter: Andrzej Bialecki
> Fix For: 0.8-dev
>
>
> Fetcher doesn't store ProtocolStatus in output segments. ProtocolStatus contains important information, such as protocol-level response code, lastModified time, and possibly other messages.
> I propose that ProtocolStatus should be stored inside CrawlDatum.metaData, which is then stored into crawl_fetch (in Fetcher.FetcherThread.output()). In addition, if ProtocolStatus contains a valid lastModified time, that CrawlDatum's modified time should also be set to this value.
> Additionally, Fetcher doesn't store redirected pages. Content of such pages is silently discarded. When Fetcher translates from protocol-level status to crawldb-level status it should probably store such pages with the following translation of status codes:
> * ProtocolStatus.TEMP_MOVED -> CrawlDatum.STATUS_DB_RETRY. This code indicates a transient change, so we probably shouldn't mark the initial URL as bad.
> * ProtocolStatus.MOVED -> CrawlDatum.STATUS_DB_GONE. This code indicates a permanent change, so the initial URL is no longer valid, i.e. it will always result in redirects.
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