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https://issues.apache.org/jira/browse/LUCENE-6183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14279171#comment-14279171
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Adrien Grand commented on LUCENE-6183:
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+1
> Avoid re-compression on stored fields merge
> -------------------------------------------
>
> Key: LUCENE-6183
> URL: https://issues.apache.org/jira/browse/LUCENE-6183
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Fix For: Trunk, 5.1
>
> Attachments: LUCENE-6183.patch, LUCENE-6183.patch
>
>
> We removed this optimization before, it didnt really work right because it
> required things to be "aligned".
> But I think we can do it simpler and safer. This recompression is a big cpu
> hog in merge, and limits our options compression-wise (especially ones like
> LZ4-HC that are only slower at write-time).
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