[jira] [Commented] (NUTCH-1708) use same id when indexing and deleting redirects

["Markus Jelsma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUTCH-1708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13968270#comment-13968270 ] 

Markus Jelsma commented on NUTCH-1708:
--------------------------------------

Yes, that seems reasonable, but we still need to get rid of the repr_url. To me it makes little sense to have  such strange behaviour in index-basic.

> use same id when indexing and deleting redirects
> ------------------------------------------------
>
>                 Key: NUTCH-1708
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1708
>             Project: Nutch
>          Issue Type: Bug
>          Components: indexer
>    Affects Versions: 1.7
>            Reporter: Sebastian Nagel
>
> Redirect targets are indexed using "representative URL"
> * in Fetcher repr URL is determined by URLUtil.chooseRepr() and stored in CrawlDatum (CrawlDb). Repr URL is either source or target URL of the redirect pair.
> * NutchField "url" is filled by basic indexing filter with repr URL
> * id field used as unique key is filled from url per solrindex-mapping.xml
> Deletion of redirects is done in IndexerMapReduce.reduce() by key which is the URL of the redirect source. If the source URL is chosen as repr URL a redirect target may get erroneously deleted.
> Test crawl with seed {{http://wiki.apache.org/nutch}} which redirects to {{http://wiki.apache.org/nutch/}}. DummyIndexWriter (NUTCH-1707) indicates that same URL is deleted and added:
> {code}
> delete  http://wiki.apache.org/nutch
> add     http://wiki.apache.org/nutch
> {code}



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