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https://issues.apache.org/jira/browse/LUCENE-3606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13162245#comment-13162245
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Uwe Schindler commented on LUCENE-3606:
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bq. TestIndexReaderReopen should maybe modified to modify the Index using
IndexWriter instead of IndexReader to test reopen functionality better. I
removed the whole modifyIndex method from this test, so it is now not going
deep enough. We should maybe revert the commit on this file and change
modifyIndex to use IndexWriter.
Done.
> Make IndexReader really read-only in Lucene 4.0
> -----------------------------------------------
>
> Key: LUCENE-3606
> URL: https://issues.apache.org/jira/browse/LUCENE-3606
> Project: Lucene - Java
> Issue Type: Task
> Components: core/index
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
>
> As we change API completely in Lucene 4.0 we are also free to remove
> read-write access and commits from IndexReader. This code is so hairy and
> buggy (as investigated by Robert and Mike today) when you work on
> SegmentReader level but forget to flush in the DirectoryReader, so its better
> to really make IndexReaders readonly.
> Currently with IndexReader you can do things like:
> - delete/undelete Documents -> Can be done by with IndexWriter, too (using
> deleteByQuery)
> - change norms -> this is a bad idea in general, but when we remove norms at
> all and replace by DocValues this is obsolete already. Changing DocValues
> should also be done using IndexWriter in trunk (once it is ready)
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