[jira] [Created] (NUTCH-1732) IndexerMapReduce to delete explicitly not indexable documents

["Sebastian Nagel (JIRA)" <ji...@apache.org>]

Sebastian Nagel created NUTCH-1732:
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             Summary: IndexerMapReduce to delete explicitly not indexable documents
                 Key: NUTCH-1732
                 URL: https://issues.apache.org/jira/browse/NUTCH-1732
             Project: Nutch
          Issue Type: Bug
          Components: indexer
    Affects Versions: 1.8
            Reporter: Sebastian Nagel
             Fix For: 1.9


In a continuous crawl a previously successfully indexed document (identified by a URL) can become "not indexable" for a couple of reasons and must then explicitly deleted from the index. Some cases are handled in IndexerMapReduce (duplicates, gone documents or redirects, cf. NUTCH-1139) but others are not:
* failed to parse (but previously successfully parsed): e.g., the document became larger and is now truncated
* rejected by indexing filter (but previously accepted)

In both cases (maybe there are more) the document should be explicitly deleted (if {{-deleteGone}} is set). Note that this cannot be done in CleaningJob because data from segments is required. 

We should also update/add a description for {{-deleteGone}}: it does not only trigger deletion of gone documents but also of redirects and duplicates (and unparseable and skipped docs).



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