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From "Ning Li (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-702) Disk full during addIndexes(Directory[]) can corrupt index
Date Tue, 12 Dec 2006 20:02:22 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-702?page=comments#action_12457858 ] 
            
Ning Li commented on LUCENE-702:
--------------------------------

> This is actually intentional: I don't want to write to the same
> segments_N filename, ever, on the possibility that a reader may be
> reading it.  Admittedly, this should be quite rare (filling up disk
> and then experiencing contention, only on Windows), but still I wanted
> to keep "write once" even in this case.

In IndexWriter, the rollbackTransaction call in commitTransaction could
cause write to the same segment_N filename, right?

The "write once" semantics is not kept for segment names or .delN. This
is ok because no reader will read the old versions.

> Disk full during addIndexes(Directory[]) can corrupt index
> ----------------------------------------------------------
>
>                 Key: LUCENE-702
>                 URL: http://issues.apache.org/jira/browse/LUCENE-702
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.1
>            Reporter: Michael McCandless
>         Assigned To: Michael McCandless
>         Attachments: LUCENE-702.patch, LUCENE-702.take2.patch
>
>
> This is a spinoff of LUCENE-555
> If the disk fills up during this call then the committed segments file can reference
segments that were not written.  Then the whole index becomes unusable.
> Does anyone know of any other cases where disk full could corrupt the index?
> I think disk full should worse lose the documents that were "in flight" at the time.
 It shouldn't corrupt the index.

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