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https://issues.apache.org/jira/browse/LUCENE-1030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-1030.
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Resolution: Duplicate
Read-only IndexReaders were added in 2.4 (LUCENE-1329).
> "Read-only" IndexReaders
> ------------------------
>
> Key: LUCENE-1030
> URL: https://issues.apache.org/jira/browse/LUCENE-1030
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael Busch
> Priority: Minor
>
> IndexReaders are able to perform certain write operations on an index
> (setNorm(), deleteDocument()). This makes issues like LUCENE-743 more
> complicated and also duplicate code for acquiring locks and write
> transactions is necessary.
> Therefore we should make IndexReaders "read-only" in the future. However, we
> have to find a good solution to support setting norms and deleting documents
> by docid with the IndexWriter. See related discussions in LUCENE-743 and
> http://www.gossamer-threads.com/lists/lucene/java-dev/52017.
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