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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Closed: (NUTCH-322) Fetcher discards ProtocolStatus, doesn't store redirected pages
Date Thu, 28 Dec 2006 00:18:24 GMT
     [ http://issues.apache.org/jira/browse/NUTCH-322?page=all ]

Andrzej Bialecki  closed NUTCH-322.
-----------------------------------

    Resolution: Fixed

Fixed in trunk/, rev. 490607 . NOTE: this doesn't solve the whole issue of proper handling
of redirected pages from the point of view of scoring and LinkDB, but it does solve the original
issue described here.

> 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
>            Reporter: Andrzej Bialecki 
>         Assigned To: Andrzej Bialecki 
>             Fix For: 0.9.0
>
>
> 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change, so the initial URL is no longer valid, i.e. it will always result in redirects.

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