IW.commit() writes but fails to fsync the N.fnx file
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Key: LUCENE-3100
URL: https://issues.apache.org/jira/browse/LUCENE-3100
Project: Lucene - Java
Issue Type: Bug
Reporter: Michael McCandless
Fix For: 4.0
In making a unit test for NRTCachingDir (LUCENE-3092) I hit this surprising bug!
Because the new N.fnx file is written at the "last minute" along with the
segments file, it's not included in the sis.files() that IW uses to figure out
which files to sync.
This bug means one could call IW.commit(), successfully, return, and then the
machine could crash and when it comes back up your index could be corrupted.
We should hopefully first fix TestCrash so that it hits this bug (maybe it
needs more/better randomization?), then fix the bug....
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