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From "lufeng (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1525) Generator to record external links even when db.ignore.external.links set to true
Date Mon, 04 Feb 2013 06:16:13 GMT


lufeng commented on NUTCH-1525:

Hi Lewis, 
Yes, The redirection of current URL will be ignored if toHost is equal to fromHost. Do you
mean we would coding like this. 

if (ignoreExternalLinks) {
        String toHost   = new URL(newUrl).getHost().toLowerCase();
        String fromHost = new URL(url).getHost().toLowerCase();
        if (toHost == null || !toHost.equals(fromHost)) {
          // external links
          // return;
          // indicate that the newUrl is an external link, not ignore
          page.putToMetadata(FetcherJob.EXTERNAL_LINKS, TableUtil.YES_VAL);

Still Put the redirection url to the Outlinks in current URL even when db.ignore.external.links
set to true. But Maybe in DbUpdate processing, the redirection url will be updated to WebDb
and fetch in next fetching.
> 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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