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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3255) Corrupted segment file not detected and wipes index contents
Date Tue, 28 Jun 2011 17:07:18 GMT


Michael McCandless commented on LUCENE-3255:

That sounds like a good fix for 2.9.x.

+1 for posting a utility here.

bq. 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?

Actually I think various filesystems could conceivably do this (write all 0s to a file), eg
on OS/hardware crash, if the file was written by not yet sync'd.

> Corrupted segment file not detected and wipes index contents
> ------------------------------------------------------------
>                 Key: LUCENE-3255
>                 URL:
>             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,,,
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 accepts >=0 as valid for backward compatibility reasons.

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