[ http://issues.apache.org/jira/browse/NUTCH-153?page=all ]
Paul Baclace updated NUTCH-153:
-------------------------------
Attachment: TextParser.java.patch
A patch to reject files with "%!PS-Adobe" in the first 40 characters of the
file.
> 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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