NRTCachingDir has invalid asserts (if same file name is written twice)
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Key: LUCENE-3658
URL: https://issues.apache.org/jira/browse/LUCENE-3658
Project: Lucene - Java
Issue Type: Bug
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 3.6, 4.0
Attachments: LUCENE-3658.patch
Normally Lucene is write-once (except for segments.gen file, which
NRTCachingDir never caches), but in some tests (TestDoc, TestCrash) we can
write the same file more than once.
I don't think NRTCachingDir should have these asserts, and I think on
createOutput it should remove any old file if present.
I also found & fixed a possible concurrency issue (if more than one thread
syncs at the same time; IndexWriter doesn't ever do this today but it has in
the past).
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