[jira] [Assigned] (NUTCH-1993) Nutch does not use backup parsers

["Sebastian Nagel (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-1993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Nagel reassigned NUTCH-1993:
--------------------------------------

    Assignee: Sebastian Nagel  (was: Chris A. Mattmann)

> Nutch does not use backup parsers
> ---------------------------------
>
>                 Key: NUTCH-1993
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1993
>             Project: Nutch
>          Issue Type: Bug
>          Components: parser
>    Affects Versions: 1.13
>            Reporter: Arkadi Kosmynin
>            Assignee: Sebastian Nagel
>            Priority: Major
>             Fix For: 1.15
>
>         Attachments: NUTCH-1193.patch
>
>
> From reading the code it is clear that it is designed to allow using several parsers to parse a document in a sequence, until it is successfully parsed. In practice, this does not work because these lines 
> if (parseResult != null && !parseResult.isEmpty())
>         return parseResult;
> break the loop even if the parsing has failed because parseResult is not empty anyway, it contains a ParseData with ParseStatus.FAILED.
> A fix:
> if ( parseResult.isAnySuccess() ) 
>         return parseResult;
> Where parseResult.isAnySuccess() returns true if any of the parsing attempts were successful.
> This fix is important because it allows use of backup parsers as originally designed and thus increase index completeness.



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