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https://issues.apache.org/jira/browse/NUTCH-656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13823182#comment-13823182
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Hudson commented on NUTCH-656:
------------------------------
SUCCESS: Integrated in Nutch-trunk #2421 (See
[https://builds.apache.org/job/Nutch-trunk/2421/])
NUTCH-656 Generic Deduplicator (jnioche, snagel) (jnioche:
http://svn.apache.org/viewvc/nutch/trunk/?view=rev&rev=1541883)
* /nutch/trunk/CHANGES.txt
* /nutch/trunk/src/bin/crawl
* /nutch/trunk/src/bin/nutch
* /nutch/trunk/src/java/org/apache/nutch/crawl/CrawlDatum.java
* /nutch/trunk/src/java/org/apache/nutch/crawl/DeduplicationJob.java
* /nutch/trunk/src/java/org/apache/nutch/indexer/CleaningJob.java
* /nutch/trunk/src/java/org/apache/nutch/indexer/IndexerMapReduce.java
> DeleteDuplicates based on crawlDB only
> ---------------------------------------
>
> Key: NUTCH-656
> URL: https://issues.apache.org/jira/browse/NUTCH-656
> Project: Nutch
> Issue Type: Wish
> Components: indexer
> Reporter: Julien Nioche
> Assignee: Julien Nioche
> Attachments: NUTCH-656.patch, NUTCH-656.v2.patch, NUTCH-656.v3.patch
>
>
> The existing dedup functionality relies on Lucene indices and can't be used
> when the indexing is delegated to SOLR.
> I was wondering whether we could use the information from the crawlDB instead
> to detect URLs to delete then do the deletions in an indexer-neutral way. As
> far as I understand the content of the crawlDB contains all the elements we
> need for dedup, namely :
> * URL
> * signature
> * fetch time
> * score
> In map-reduce terms we would have two different jobs :
> * read crawlDB and compare on URLs : keep only most recent element - oldest
> are stored in a file and will be deleted later
> * read crawlDB and have a map function generating signatures as keys and URL
> + fetch time +score as value
> * reduce function would depend on which parameter is set (i.e. use signature
> or score) and would output as list of URLs to delete
> This assumes that we can then use the URLs to identify documents in the
> indices.
> Any thoughts on this? Am I missing something?
> Julien
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