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Date: Sat, 13 Nov 2010 13:37:13 -0500 (EST)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Created: (LUCENE-2759) We should never open an IndexInput
 when an IndexOutput is still open
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We should never open an IndexInput when an IndexOutput is still open
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                 Key: LUCENE-2759
                 URL: https://issues.apache.org/jira/browse/LUCENE-2759
             Project: Lucene - Java
          Issue Type: Bug
          Components: Index
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 2.9.4, 3.0.3, 3.1, 4.0


I modified MockDirWrapper to assert this (except for
segments_N/segments.gen, where it's expected), and, it uncovered a
couple of places involving NRT readers where we open a shared doc
store file that's still open for writing.

First, if you install a merged segment warmer, we were failing to
force the merge of the doc stores in this case, thus potentially
opening the same doc stores that are also still open for writing.

Second, if you're actively adding docs in other threads when you call
IW.getReader(), the other threads could sneak in and flush new
segments sharing the doc stores.  The returned reader then opens the
doc store files that are still open for writing.


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