lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4127) negative offsets/deltas corrumption
Date Sun, 10 Jun 2012 12:23:42 GMT
Robert Muir created LUCENE-4127:
-----------------------------------

             Summary: negative offsets/deltas corrumption
                 Key: LUCENE-4127
                 URL: https://issues.apache.org/jira/browse/LUCENE-4127
             Project: Lucene - Java
          Issue Type: Bug
          Components: core/index
    Affects Versions: 4.0
            Reporter: Robert Muir
         Attachments: LUCENE-4127_test.patch

If offsets go negative or backwards, it can corrupt the index with DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS:
the offsets will have wrong values (different from the term vectors) or even crazy values
like -2147483645

The problem with this is that its not just theoretical: its too easy to do this with lucene's
own analyzer chains (e.g. ngramtokenizer).
 
See issues such as LUCENE-3920 and some discussion on LUCENE-3738

The question is how to fix this, e.g. should we:
# start enforcing that offsets cannot be crazy values in OffsetAttributeImpl/IndexWriter and
fix the broken analyzers
# leave offsets as a pair of opaque integers, declaring this a limitation of the current codec,
and either workaround or throw UOE from the postings writer.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message