Remove write access from SegmentReader and possibly move to separate class or
IndexWriter/BufferedDeletes/...
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Key: LUCENE-3631
URL: https://issues.apache.org/jira/browse/LUCENE-3631
Project: Lucene - Java
Issue Type: Task
Components: core/index
Affects Versions: 4.0
Reporter: Uwe Schindler
After LUCENE-3606 is finished, there are some TODOs:
SegmentReader still contains (package-private) all delete logic including crazy
copyOnWrite for validDocs Bits. It would be good, if SegmentReader itsself
could be read-only like all other IndexReaders.
There are two possibilities to do this:
# the simple one: Subclass SegmentReader and make a RWSegmentReader that is
only used by IndexWriter/BufferedDeletes/... DirectoryReader will only use the
read-only SegmentReader. This would move all TODOs to a separate class. It's
reopen/clone method would always create a RO-SegmentReader (for NRT).
# Remove all write and commit stuff from SegmentReader completely and move it
to IndexWriter's readerPool (it must be in readerPool as deletions need a
not-changing view on an index snapshot).
Unfortunately the code is so complicated and I have no real experience in those
internals of IndexWriter so I did not want to do it with LUCENE-3606, I just
separated the code in SegmentReader and marked with TODO. Maybe Mike McCandless
can help :-)
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