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From "Lewis John McGibbney (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1525) Generator to record external links even when db.ignore.external.links set to true
Date Fri, 01 Feb 2013 03:39:13 GMT


Lewis John McGibbney commented on NUTCH-1525:

Hi Lufeng.
Yes I think you are right. I would like to make sure though, please comment.
The URL is already stored in the WebDB before we check for the redirect in FetcherReducer#handleRedirect()
(in 2.x)

      if (ignoreExternalLinks) {
        String toHost   = new URL(newUrl).getHost().toLowerCase();
        String fromHost = new URL(url).getHost().toLowerCase();
        if (toHost == null || !toHost.equals(fromHost)) {
          // external links
> Generator to record external links even when  db.ignore.external.links set to true
> ----------------------------------------------------------------------------------
>                 Key: NUTCH-1525
>                 URL:
>             Project: Nutch
>          Issue Type: Improvement
>          Components: generator
>            Reporter: Lewis John McGibbney
>            Priority: Minor
>             Fix For: 1.7, 2.2
> When fetching pages from specific domains we have various options e.g. use urlfilters,
set the above property to true before injecting urls into the webdb etc. However with the
former, it is recognised that complex regex can slow down processing and with the latter it
means we disregard a number of urls which could potentially become useful in the future.
> Unfortunately there is no way to record external links encountered for future processing,
although the wiki suggests that a very small patch to the generator code can allow you to
log these links to hadoop.log. although this is better, a more robusts storage mechanism would
be preferred. This may tie in with custom counters we've already specified or may require
new counters to be implemented.  

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