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From "Riyaz Shaik (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (NUTCH-1614) Plugin to exclude URLs matching regex list from indexing - to enable crawl but do not index
Date Thu, 12 Jun 2014 09:10:01 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-1614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028919#comment-14028919
] 

Riyaz Shaik edited comment on NUTCH-1614 at 6/12/14 9:08 AM:
-------------------------------------------------------------

We have implemented a similar kind of feature for crawling our sites a year ago or so, I have
come across this ticket so just thought of sharing the implementation approach(It's not a
plugin approach like existing filters/normalizers).

Created a util class for our customization to handle reading different types of regex patterns
like include and exclude as nutch supports.

(on) Nutch version : 2.1
* org.apache.nutch.util.RegexUtil (source code attached)
Added the following changes to IndexerJob class
* org.apache.nutch.indexer.IndexerJob (attached the source code)
code snippet:
{code} 
package org.apache.nutch.indexer;
....
import org.apache.nutch.util.RegexUtil;
import org.apache.nutch.util.TableUtil;
public abstract class IndexerJob extends NutchTool implements Tool {

  public static final Logger LOG = LoggerFactory.getLogger(IndexerJob.class);
  public static final String INDEXING_EXCLUDE_URL_PATTERNS_FILE = "indexing.exclude.url.patterns.file";

 public void setup(Context context) throws IOException {
.....
  String regexPatternsFileName = conf.get(INDEXING_EXCLUDE_URL_PATTERNS_FILE);
      if (regexPatternsFileName != null) {
    	  LOG.info("Loading indexing exculde patterns from the nutch configurations:");
    	  RegexUtil.loadRegexPatterns(conf.getConfResourceAsReader(regexPatternsFileName));
      }
}

public void map(String key, WebPage page, Context context)
    throws IOException, InterruptedException {
      ParseStatus pstatus = page.getParseStatus();
      if (pstatus == null || !ParseStatusUtils.isSuccess(pstatus)
          || pstatus.getMinorCode() == ParseStatusCodes.SUCCESS_REDIRECT) {
        return; // filter urls not parsed
      }
      =======================================
     /*
       * To skip the matched url patterns from indexing.
       * 
       */
      String pageUrl = TableUtil.unreverseUrl(key);
      if (RegexUtil.findMatch(pageUrl)){
    	  LOG.info("Skipping the url : " + pageUrl + " from indexing; matched the indexing exclude
url patterns.");
    	  return;
      }
      ==================================
.......
.....
{code}
* Add the following property to *??nutch-site.xml??*
{code}
<property>
  <name>indexing.exclude.url.patterns.file</name>
  <value>crawl-donot-index-patterns.txt</value>
 </property>
{code}



was (Author: riyaz):
I have implemented a similar kind of feature for crawling our sites a year ago or so, I have
come across this ticket so just thought of sharing the implementation approach(It's not a
plugin approach like existing filters/normalizers).

Created a util class for our customization to handle reading different types of regex patterns
like include and exclude as nutch supports.

(on) Nutch version : 2.1
* org.apache.nutch.util.RegexUtil (source code attached)
Added the following changes to IndexerJob class
* org.apache.nutch.indexer.IndexerJob (attached the source code)
code snippet:
{code} 
package org.apache.nutch.indexer;
....
import org.apache.nutch.util.RegexUtil;
import org.apache.nutch.util.TableUtil;
public abstract class IndexerJob extends NutchTool implements Tool {

  public static final Logger LOG = LoggerFactory.getLogger(IndexerJob.class);
  public static final String INDEXING_EXCLUDE_URL_PATTERNS_FILE = "indexing.exclude.url.patterns.file";

 public void setup(Context context) throws IOException {
.....
  String regexPatternsFileName = conf.get(INDEXING_EXCLUDE_URL_PATTERNS_FILE);
      if (regexPatternsFileName != null) {
    	  LOG.info("Loading indexing exculde patterns from the nutch configurations:");
    	  RegexUtil.loadRegexPatterns(conf.getConfResourceAsReader(regexPatternsFileName));
      }
}

public void map(String key, WebPage page, Context context)
    throws IOException, InterruptedException {
      ParseStatus pstatus = page.getParseStatus();
      if (pstatus == null || !ParseStatusUtils.isSuccess(pstatus)
          || pstatus.getMinorCode() == ParseStatusCodes.SUCCESS_REDIRECT) {
        return; // filter urls not parsed
      }
      =======================================
     /*
       * To skip the matched url patterns from indexing.
       * 
       */
      String pageUrl = TableUtil.unreverseUrl(key);
      if (RegexUtil.findMatch(pageUrl)){
    	  LOG.info("Skipping the url : " + pageUrl + " from indexing; matched the indexing exclude
url patterns.");
    	  return;
      }
      ==================================
.......
.....
{code}
* Add the following property to *??nutch-site.xml??*
{code}
<property>
  <name>indexing.exclude.url.patterns.file</name>
  <value>crawl-donot-index-patterns.txt</value>
 </property>
{code}


> Plugin to exclude URLs matching regex list from indexing - to enable crawl but do not
index
> -------------------------------------------------------------------------------------------
>
>                 Key: NUTCH-1614
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1614
>             Project: Nutch
>          Issue Type: Improvement
>          Components: indexer
>    Affects Versions: 2.2.1
>            Reporter: Brian
>            Priority: Minor
>              Labels: plugin
>         Attachments: IndexerJob.java, NUTCH-1614.patch, RegexUtil.java
>
>
> Some pages we need to crawl (such as some main pages and different views of a main page)
to get all the other pages, but we don't want to index those pages themselves.  Therefore
we cannot use the url filter approach.
> This plugin uses a file containing regex strings (see included sample file).  If one
of the regex strings matches with an entire URL, that URL will be excluded form indexing.
> The file to use is specified by the following property in nutch-site.xml:
> <property>
>         <name>indexer.url.filter.exclude.regex.file</name>
>         <value>regex-indexer-exclude-urls.txt</value>
>         <description>
>             Holds the file name containing the regex strings.  Any URL matching one of
these strings will be excluded from indexing. 
>             "#" indicates a comment line and will be ignored.
>         </description>
> </property>



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