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From "Uwe Schindler (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3606) Make IndexReader really read-only in Lucene 4.0
Date Mon, 28 Nov 2011 17:09:40 GMT
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


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by DocValues this is obsolete already.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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