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From "Mark Harwood (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3255) Corrupted segment file not detected and wipes index contents
Date Tue, 28 Jun 2011 16:42:16 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13056619#comment-13056619
] 

Mark Harwood commented on LUCENE-3255:
--------------------------------------

Thanks for the quick turnaround Mike/Simon.

Greg is on 2.9.x and so the suggestion I have is that he adds some checking code in the app
to remove the latest segments_n file if it looks to have anything other than -9 as a format
value given he knows that his Lucene indexes should always be of that version. Maybe that
could be a utility class that can be posted here on this issue for others who might share
this issue. I'm guessing it's a quirk of the  file system to leave that all-zeros file in
place prior to a flush of some kind?



> 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, 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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