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https://issues.apache.org/jira/browse/LUCENE-6090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14232821#comment-14232821
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Adrien Grand commented on LUCENE-6090:
--------------------------------------
+1
> 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, LUCENE-6090.patch, 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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