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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3255) Corrupted segment file not detected and wipes index contents
Date Wed, 29 Jun 2011 07:33:28 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057052#comment-13057052
] 

Simon Willnauer commented on LUCENE-3255:
-----------------------------------------

I wonder if we could check the latest segments_N file against a previous one and if the version
of that file is older that the previous one we drop it since we don't provide forward compatibility.
we could even spin a 2.9 bugfix release for that though.


> 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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