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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-2593) disk full can cause index corruption in certain cases
Date Tue, 10 Aug 2010 22:35:21 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless resolved LUCENE-2593.
----------------------------------------

    Resolution: Fixed

> disk full can cause index corruption in certain cases
> -----------------------------------------------------
>
>                 Key: LUCENE-2593
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2593
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 2.9.4, 3.0.3, 3.1, 4.0
>
>         Attachments: LUCENE-2593.patch
>
>
> Robert uncovered this nasty bug, in adding more randomness to
> oal.index tests...
> I got a standalone test to show the issue; the corruption path is
> as follows:
>   * The merge hits an initial exception (eg disk full when merging the
>     postings).
>   * In handling this exception, IW closes all the sub-readers,
>     suppressing any further exceptions.
>   * If one of these sub-readers has pending deletions, which happens
>     if readers are pooled in IW, it will flush them.  If that flush
>     hits a 2nd exception (eg disk full), then SegmentReader
>     [incorrectly] leaves the SegmentInfo's delGen advanced by 1,
>     referencing a corrupt file, yet the SegmentReader is still
>     forcefully closed.
>   * If enough disk frees up such that a later IW.commit/close
>     succeeds, the resulting segments file will reference an invalid
>     deletions file.

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