Robert Muir created LUCENE-4127:
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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.
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