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https://issues.apache.org/jira/browse/LUCENE-3255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057186#comment-13057186
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Michael McCandless commented on LUCENE-3255:
--------------------------------------------
Actually, we can do something even simpler here: in the 1.9.x days Lucene never
wrote a generation (_N) segments file. It always wrote just "segments", so, if
we see first int is a 0, and the file has a generation in it, then it's corrupt.
> Corrupted segment file not detected and wipes index contents
> ------------------------------------------------------------
>
> Key: LUCENE-3255
> URL: https://issues.apache.org/jira/browse/LUCENE-3255
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.9.4, 3.2
> Reporter: Mark Harwood
> Assignee: Michael McCandless
> Fix For: 3.4
>
> Attachments: AllZerosSegmentFile, BadSegmentsFileTest.java,
> CorruptionCheckerForPreLucene3.java, LUCENE-3255.patch,
> LUCENE-3255_testcase.patch
>
>
> Lucene will happily wipe an existing index if presented with a latest
> generation segments_n file of all zeros. File format documentation says
> segments_N files should start with a format of -9 but SegmentInfos.read
> accepts >=0 as valid for backward compatibility reasons.
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