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https://issues.apache.org/jira/browse/LUCENE-859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487640
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Otis Gospodnetic 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.
What do you think about committing just that? Maybe that should be added to
the existing IndexReader.main ?
Or maybe it's time to start an app/class in contrib/index that takes various
command line parameters and prints out information about the index? If so,
I'll move that to a new JIRA issue.
> 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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