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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2014/12/03 09:14:12 UTC

[jira] [Updated] (LUCENE-6090) don't wrap Deflater in CompressionMode

     [ https://issues.apache.org/jira/browse/LUCENE-6090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-6090:
--------------------------------
    Attachment: LUCENE-6090.patch

> don't wrap Deflater in CompressionMode
> --------------------------------------
>
>                 Key: LUCENE-6090
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6090
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>         Attachments: LUCENE-6090.patch
>
>
> This outputs zlib header/footer and computes adler32 for each block. The space is nothing, but the adler32 computation on encode/decode has a cost, and we already have our own checksum.
> Since we currently compress/decompress at merge, this reduces the overall time of merging stored fields with deflate vs lz4, from 1.8x to 1.5x, reducing some of the pain.



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