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https://issues.apache.org/jira/browse/NUTCH-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108701#comment-13108701
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Julien Nioche commented on NUTCH-1052:
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Yep, that's the idea.
The class will have to be Writable and should live at the same place as
NutchDocument i.e. org.apache.nutch.indexer
> Multiple deletes of the same URL using SolrClean
> ------------------------------------------------
>
> Key: NUTCH-1052
> URL: https://issues.apache.org/jira/browse/NUTCH-1052
> Project: Nutch
> Issue Type: Improvement
> Components: indexer
> Affects Versions: 1.3, 1.4
> Reporter: Tim Pease
> Assignee: Julien Nioche
> Fix For: 1.4, 2.0
>
> Attachments: NUTCH-1052-1.4-1.patch, NUTCH-1052-1.4-2.patch,
> NUTCH-1052-1.4-3.patch
>
>
> The SolrClean class does not keep track of purged URLs, it only checks the
> URL status for "db_gone". When run multiple times the same list of URLs will
> be deleted from Solr. For small, stable crawl databases this is not a
> problem. For larger crawls this could be an issue. SolrClean will become an
> expensive operation.
> One solution is to add a "purged" flag in the CrawlDatum metadata. SolrClean
> would then check this flag in addition to the "db_gone" status before adding
> the URL to the delete list.
> Another solution is to add a new state to the status field
> "db_gone_and_purged".
> Either way, the crawl DB will need to be updated after the Solr delete has
> successfully occurred.
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