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https://issues.apache.org/jira/browse/NUTCH-1708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13968762#comment-13968762
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Sebastian Nagel commented on NUTCH-1708:
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??need to get rid of the repr_url??
Not necessarily:
# if we use for field 'id' the URL a document has been accessed (with any
possible status), everything (indexing, updating, deletion) should work --
those IDs are in sync with CrawlDb and may never appear twice.
# then we are free to fill the field 'url' with a more "pretty thing": repr URL
(usually shorter), punycoded (without ugly {{xn--}}), showing letters instead
of percent-encoded sequences, etc. Since field 'url' is tokenized, decoding the
content makes more sense. In doubt, we could make it configurable which of
these "denormalization" steps are applied.
# finally, we achieve the same behaviour in 1.x and 2.x
> 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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