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https://issues.apache.org/jira/browse/LUCENE-3870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-3870:
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Attachment: LUCENE-3870.patch
nice catch mike! Here is a patch fixing PagedBytes.Reader#fillSliceWithPrefix
this is a general trap and should be fixed in this method IMO
> VarDerefBytesImpl doc values prefix length may fall across two pages
> --------------------------------------------------------------------
>
> Key: LUCENE-3870
> URL: https://issues.apache.org/jira/browse/LUCENE-3870
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Michael McCandless
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3870.patch, LUCENE-3870.patch
>
>
> The VarDerefBytesImpl doc values encodes the unique byte[] with prefix (1 or
> 2 bytes) first, followed by bytes, so that it can use
> PagedBytes.fillSliceWithPrefix.
> It does this itself rather than using PagedBytes.copyUsingLengthPrefix...
> The problem is, it can write an invalid 2 byte prefix spanning two blocks
> (ie, last byte of block N and first byte of block N+1), which
> fillSliceWithPrefix won't decode correctly.
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