Nancy Snyder wrote:
> Previously I was using nutch-0.7.2 and was able to use SegmentReader
> to read a specific segment
> and then use the next method to read values from the open readers
> (FetcherOutput, Content, ParseText, and ParseData).
>
> segmentReader = new SegmentReader(nfs, allSegmentFiles[i],
> true, true, true, true);
> while(segmentReader.next(fo, co, pt, pd)) {
> ...
> }
>
> From using the fo (FetcherOutput), I could get the fetch date
> (fo.getFetchDate()).
> From using the pd (ParseData), I could get the title (fd.getTitle()).
> From using the pt (ParseText), I could get the parsed text
> (ft.getText()).
>
> Now I trying to upgrade to nutch 0.8.x and I have downloaded nutch-0.8.1.
> I am looking at the API and do not see how to read the data from the
> crawled segments.
> SegmentReader has changed and no longer has next. I see a get(Path
> segment, UTF8 key, Writer writer, Map results)
> but don't have an code example.
>
> I want to loop thru the records (or documents) in a segment and get
> the data (url, title, parsed text).
>
> Can anyone, show me how to do this?
SegmentReader is itself an example how to use this API , although most
operations are not performed directly - instead the data is submitted to
a map-reduce job. Although the method that you mention (get) does
illustrate how to do it without running a map-reduce job.
Please see also http://issues.apache.org/jira/browse/HADOOP-175 for
utilities that allow to read directly data from each segment part,
without running a map-reduce job.
--
Best regards,
Andrzej Bialecki <><
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