Robert Muir created LUCENE-4128:
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Summary: add safety to preflex segmentinfo "upgrade"
Key: LUCENE-4128
URL: https://issues.apache.org/jira/browse/LUCENE-4128
Project: Lucene - Java
Issue Type: Bug
Affects Versions: 4.0
Reporter: Robert Muir
Currently the one-time-upgrade depends on whether the upgraded .si file exists.
And the writing is done in a try/finally so its removed if ioexception happens.
but I think there could be a power-loss or something else in the middle of
this, the upgraded .si file could be bogus, then the user would have to
manually remove it (they probably wouldnt know).
i think instead we should just have a marker file on completion, that we create
after we successfully fsync the upgraded .si file. this way if something
happens we just rewrite the thing.
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