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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NUTCH-153) TextParser is only supposed to parse plain text, but if given postscript, it can take hours and then fail
Date Fri, 06 Jan 2006 20:39:17 GMT
    [ http://issues.apache.org/jira/browse/NUTCH-153?page=comments#action_12362002 ] 

Doug Cutting commented on NUTCH-153:
------------------------------------

Paul,

Does http://issues.apache.org/jira/browse/NUTCH-160 address this issue too?  I.e., is at least
part of the problem that oro has some slow cases that Java's built-in regex's do not?


> TextParser is only supposed to parse plain text, but if given postscript, it can take
hours and then fail
> ---------------------------------------------------------------------------------------------------------
>
>          Key: NUTCH-153
>          URL: http://issues.apache.org/jira/browse/NUTCH-153
>      Project: Nutch
>         Type: Bug
>   Components: fetcher
>     Versions: 0.8-dev
>  Environment: all
>     Reporter: Paul Baclace
>  Attachments: TextParser.java.patch
>
> If TextParser is given postscript, it can take hours and then fail.  This can be avoided
with careful configuration, but if the server MIME type is wrong and the basename of the URL
has no "file extension", then the this parser will take a long time and fail every time.
> Analysis: The real problem is OutlinkExtractor.java as reported with bug NUTCH-150, but
the problem cannot be entirely addressed with that patch since the first call to reg expr
match() can take a long time, despite quantifier limits.  
> Suggested fix: Reject files with "%!PS-Adobe" in the first 40 characters of the file.
> Actual experience has shown that for safety and fail-safe reasons, it is worth protecting
against GIGO directly in TextParse for this case, even though the suggested fix is not a general
solution.  (A general solution would be a timeout on match().)

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