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https://issues.apache.org/jira/browse/NUTCH-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabriele Kahlout updated NUTCH-1001:
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Attachment: multipleSegs-fetch-parse.patch
This patch modifers Fetcher.java and ParseSegment.java so that before they
proceed with fetching/parsing they check the segment name and if it's not
parsable into a long expects it to be a segments directory (not recursively, to
keep my changes minimal) and parses/fetches the subdirectories.
I've added a -lastestOnly (better rename into -lastOnly?) cli option such that
only the last segment in a segments directory is parsed. The criteria for last
is an array index (which thinking of it now is probably arbitrary, but could be
easily extended to sort the long timestamps).
A fetch/parse returns 0 if at least one segment was successfully
parsed/fetched, and -1 otherwise.
I hope you consider my suggestion. I've tested it on my own script and it
worked (miracolously from the first time).
> bin/nutch fetch/parse handle crawl/segments directory
> -----------------------------------------------------
>
> Key: NUTCH-1001
> URL: https://issues.apache.org/jira/browse/NUTCH-1001
> Project: Nutch
> Issue Type: Improvement
> Reporter: Gabriele Kahlout
> Priority: Minor
> Attachments: multipleSegs-fetch-parse.patch
>
>
> I'm having issues porting scripts across different systems to support the
> step of extracting the latest/only segments resulting from the generate phase.
> Variants include:
> $ export SEGMENT=crawl/segments/`ls -tr crawl/segments|tail -1` #[1]
> $ s1=`ls -d crawl/segments/2* | tail -1` #[2]
> $ segment=`$HADOOP_HOME/bin/hadoop dfs -ls crawl/segments | tail -1 | grep -o
> [a-zA-Z0-9/\-]* |tail -1`
> $ segment=`$HADOOP_HOME/bin/hdfs -ls crawl/segments | tail -1 | grep -o
> [a-zA-Z0-9/\-]* |tail -1`
> And I'm not sure what windows users would have to do. Some users may also do
> with:
> bin/nutch fetch with crawl/segments/2*
> But I don't see a need in having the user extract/worry-about the latest/only
> segment, and have it a described step in every nutch tutorial. More over only
> fetch and parse expect a segment while other commands are fine with the
> directory of segments.
> Therefore, I think it's beneficial if fetch and parse also handle directories
> of segments.
> [1] http://www.lucidimagination.com/blog/2009/03/09/nutch-solr/
> [2] http://wiki.apache.org/nutch/NutchTutorial#Command_Line_Searching
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