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https://issues.apache.org/jira/browse/LUCENE-859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487644
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Yonik Seeley commented on LUCENE-859:
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> Though it might still be handy to have something with main() that spits out
> the number of deleted
> documents, as SegmentReader has in my patch.
I don't understand that comment. I don't see anything in your patch besides
the implementation of deletedDocs().
> Maybe that should be added to the existing IndexReader.main ?
That sounds fine.
> Expose the number of deleted docs in index/segment
> --------------------------------------------------
>
> Key: LUCENE-859
> URL: https://issues.apache.org/jira/browse/LUCENE-859
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Reporter: Otis Gospodnetic
> Assigned To: Otis Gospodnetic
> Priority: Minor
> Attachments: LUCENE-859
>
>
> Use case:
> We've got a lot of large, mostly search-only indices. These indices are not
> re-optimized once "deployed". Docs in them do not get updated, but they do
> get deleted. After a while, the number of deleted docs grows, but it's hard
> to tell how many documents have been deleted.
> Exposing the number of deleted docs via *Reader.deletedDocs() method let's
> you get to this number.
> I'm attaching patch that touches the following:
> M src/test/org/apache/lucene/index/TestSegmentReader.java
> M src/java/org/apache/lucene/index/MultiReader.java
> M src/java/org/apache/lucene/index/IndexReader.java
> M src/java/org/apache/lucene/index/FilterIndexReader.java
> M src/java/org/apache/lucene/index/ParallelReader.java
> M src/java/org/apache/lucene/index/SegmentReader.java
> SegmentReader also got a public static main(String[]) that takes 1
> command-line parameter, a path to the index to check, and prints out the
> number of deleted docs.
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