[jira] [Updated] (NUTCH-2075) Generate will not choose URL marker distance NULL

["Alexandre Demeyer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-2075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexandre Demeyer updated NUTCH-2075:
-------------------------------------
    Description: 
It appears that there is a bug about certain links where nutch erases all markers and not only the inject, generate, fetch, parse, update markers but also the distance marker.

For that reason, Nutch Generator doesn't check the validity of the marker distance (check if it's null) and keep wrong links (without the distance marker) in the GeneratorMapper.

I think it's in relation with the problem mention here : [NUTCH-1930|https://issues.apache.org/jira/browse/NUTCH-1930].

This doesn't solved the problem which is all markers are erased (without any reasons apparently ..). But it can allow to stop the crawl...

In order to find a solution about stopping crawl with problematics URL, I proposed this solution which is simply to avoid the URL when the distance marker is NULL.

(Sorry if i put here the code)
{code:title=crawl/GeneratorMapper.java (initial code)|borderStyle=solid}
// filter on distance
    if (maxDistance > -1) {
      CharSequence distanceUtf8 = page.getMarkers().get(DbUpdaterJob.DISTANCE);
      if (distanceUtf8 != null) {
        int distance = Integer.parseInt(distanceUtf8.toString());
        if (distance > maxDistance) {
          return;
        }
      }
    }

{code}

{code:title=crawl/GeneratorMapper.java (patch code)|borderStyle=solid}
// filter on distance
    if (maxDistance > -1) {
      CharSequence distanceUtf8 = page.getMarkers().get(DbUpdaterJob.DISTANCE);
      if (distanceUtf8 != null) {
        int distance = Integer.parseInt(distanceUtf8.toString());
        if (distance > maxDistance) {
          return;
        }
      }
      else
      {
        return;
      }
    }

{code}

Example of links where the problem appears (put an http.content.limit highter than the content-length PDF) :
http://www.annales.org/archives/x/marchal2.pdf

  was:
It appears that there is a bug about certain links where nutch erases all markers and not only the inject, generate, fetch, parse, update markers but also the distance marker.

For that reason, Nutch Generator doesn't check the validity of the marker distance (check if it's null) and keep wrong links (without the distance marker) in the GeneratorMapper.

I think it's in relation with the problem mention here : [NUTCH-1930|https://issues.apache.org/jira/browse/NUTCH-1930].

This doesn't solved the problem which is all markers are erased (without any reasons apparently ..).

In order to find a solution about stopping crawl with problematics URL, I proposed this solution which is simply to avoid the URL when the distance marker is NULL.

Example of links where the problem appears (put an http.content.limit highter than the content-length PDF) :
http://www.annales.org/archives/x/marchal2.pdf


> Generate will not choose URL marker distance NULL
> -------------------------------------------------
>
>                 Key: NUTCH-2075
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2075
>             Project: Nutch
>          Issue Type: Bug
>          Components: generator
>    Affects Versions: 2.3
>         Environment: Using HBase as back-end Storage
>            Reporter: Alexandre Demeyer
>            Priority: Minor
>              Labels: newbie, patch, performance
>
> It appears that there is a bug about certain links where nutch erases all markers and not only the inject, generate, fetch, parse, update markers but also the distance marker.
> For that reason, Nutch Generator doesn't check the validity of the marker distance (check if it's null) and keep wrong links (without the distance marker) in the GeneratorMapper.
> I think it's in relation with the problem mention here : [NUTCH-1930|https://issues.apache.org/jira/browse/NUTCH-1930].
> This doesn't solved the problem which is all markers are erased (without any reasons apparently ..). But it can allow to stop the crawl...
> In order to find a solution about stopping crawl with problematics URL, I proposed this solution which is simply to avoid the URL when the distance marker is NULL.
> (Sorry if i put here the code)
> {code:title=crawl/GeneratorMapper.java (initial code)|borderStyle=solid}
> // filter on distance
>     if (maxDistance > -1) {
>       CharSequence distanceUtf8 = page.getMarkers().get(DbUpdaterJob.DISTANCE);
>       if (distanceUtf8 != null) {
>         int distance = Integer.parseInt(distanceUtf8.toString());
>         if (distance > maxDistance) {
>           return;
>         }
>       }
>     }
> {code}
> {code:title=crawl/GeneratorMapper.java (patch code)|borderStyle=solid}
> // filter on distance
>     if (maxDistance > -1) {
>       CharSequence distanceUtf8 = page.getMarkers().get(DbUpdaterJob.DISTANCE);
>       if (distanceUtf8 != null) {
>         int distance = Integer.parseInt(distanceUtf8.toString());
>         if (distance > maxDistance) {
>           return;
>         }
>       }
>       else
>       {
>         return;
>       }
>     }
> {code}
> Example of links where the problem appears (put an http.content.limit highter than the content-length PDF) :
> http://www.annales.org/archives/x/marchal2.pdf



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