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https://issues.apache.org/jira/browse/LUCENE-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-5201:
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Attachment: LUCENE-5201.patch
This bugs needed two conditions to appear:
- the input needs to be highly compressible so that there are collisions in
the chain table used for finding references backwards in the stream,
- the start offset needs to be > 0.
CompressingStoredFieldFormat only calls LZ4.compress(HC) with positive start
offsets since LUCENE-5188 so this shouldn't have impact on people who were
using CompressionMode.FAST_DECOMPRESSION (which seems to be confirmed by the
fact that we never saw any test failure related to this until today, only a few
minutes after I committed LUCENE-5188).
I was able to write a test case that reproduces the bug and changed the
existing tests so that they don't only test compression with a start offset of
0.
> Compression issue on highly compressible inputs with LZ4.compressHC
> -------------------------------------------------------------------
>
> Key: LUCENE-5201
> URL: https://issues.apache.org/jira/browse/LUCENE-5201
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5201.patch
>
>
> LZ4.compressHC sometimes fails at compressing highly compressible inputs when
> the start offset is > 0.
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