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https://issues.apache.org/jira/browse/LUCENE-2740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer resolved LUCENE-2740.
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Resolution: Fixed
LUCENE-2742 fixed that problem
> PerFieldCodecWrapper causes crashes if not all per field codes have been used
> -----------------------------------------------------------------------------
>
> Key: LUCENE-2740
> URL: https://issues.apache.org/jira/browse/LUCENE-2740
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-2740.patch
>
>
> If a PerFieldCodecWrapper is used an SegmentMerger tries to merge two
> segments where one segment only has a subset of the field
> PerFieldCodecWrapper defines SegmentMerger tries to open non-existing files
> since Codec#files(Directory, SegmentInfo, Set<String>) blindly copies the
> expected files into the given set. This also hits exceptions in CheckIndex
> and addIndexes().
> The reason for this is that PerFieldCodecWrapper simply iterates over the
> codecs it knows and adds all files without checking if they are present in
> the given Directory. We need to have some mechnanism that check if the
> "required" files for a codec are present and only add the files to the set if
> that field is really there.
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