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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2014/08/29 19:15:54 UTC

[jira] [Closed] (LUCENE-5046) Explore preset dictionaries for CompressingStoredFieldsFormat

     [ https://issues.apache.org/jira/browse/LUCENE-5046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand closed LUCENE-5046.
--------------------------------

    Resolution: Duplicate

I close this issue in favor of LUCENE-5914 that uses shared dictionaries in order to make decompression faster.

> Explore preset dictionaries for CompressingStoredFieldsFormat
> -------------------------------------------------------------
>
>                 Key: LUCENE-5046
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5046
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Trivial
>
> I discussed this possible improvement with Stefan Pohl and Andrzej Białecki at Berlin Buzzwords: By having preset dictionaries (which could be user-provided and/or computed on a per-block basis), decompression could be faster since we would never have to decompress several documents from a block in order to access a single document.
> One drawback is that it would require putting some boundaries in the compressed stream, so it would maybe decrease a little the compression ratio. But then if decompression is faster, we could also afford larger blocks, so I think this is worth exploring.



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