In NRT mode, and CFS enabled, IndexWriter incorrectly ties up disk space
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Key: LUCENE-2097
URL: https://issues.apache.org/jira/browse/LUCENE-2097
Project: Lucene - Java
Issue Type: Bug
Components: Index
Affects Versions: 3.0, 2.9.1, 2.9
Reporter: Michael McCandless
Assignee: Michael McCandless
Priority: Minor
Fix For: 3.1
Spinoff of java-user thread titled "searching while optimize"...
If IndexWriter is in NRT mode (you've called getReader() at least
once), and CFS is enabled, then internally the writer pools readers.
However, after a merge completes, it opens the reader against het
non-CFS segment files, and pools that. It then builds the CFS file,
as well, thus tying up the storage for that segment twice.
Functionally the bug is harmless (it's only a disk space issue).
Also, when the segment is merged, the disk space is released again
(though the newly merged segment will also be double-tied-up).
Simple workaround is to use non-CFS mode, or, don't use getReader.
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