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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] Commented: (NUTCH-574) Including inlink anchor text in index can create irrelevant search results.
Date Fri, 09 Nov 2007 20:25:50 GMT


Andrzej Bialecki  commented on NUTCH-574:

+1 on making it into a plugin (e.g. index-anchors). -1 on implementing any sort of filtering
- as Enis pointed out, the issue is complicated in itself, and additionally depends on the
user requirements. I propose the following: let's implement a basic version (which is implemented
now in the form of LinkDb.getAnchors()), and leave users the freedom to complicate away if
they wish to do so.

Re: scoring - this is again tricky, because the top-N most frequent words happen to be stopwords,
and if that's the case you need to know the language of the corpus in order to properly detect
them and remove from the top-N ... very messy.

> Including inlink anchor text in index can create irrelevant search results.
> ---------------------------------------------------------------------------
>                 Key: NUTCH-574
>                 URL:
>             Project: Nutch
>          Issue Type: Bug
>          Components: indexer
>         Environment: All, basic indexing filter
>            Reporter: Dennis Kubes
>            Assignee: Dennis Kubes
>             Fix For: 1.0.0
>         Attachments: NUTCH-574-1.patch
> Currently the basic indexing filter includes inbound anchor text for a given URL in the
index.  This sometimes allows pages to show up in search results where they may not be relevant.
 An example of this is a search for "dallas hotels" in our production index (
 Google would show up first in this example although there is no text matching either dallas
or hotels on the google home page.  What is happening here is there are inlinks into google
with the words dallas and hotels which get included in the index for and because
google would have a very high boost due to inlinks, google shows up first for these search
terms.  I propose we add an option to allow/prevent inlink anchor text from being included
in the index and set the default for this option to NOT include inbound link anchor text.

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