[jira] [Updated] (LUCENE-6183) Avoid re-compression on stored fields merge

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-6183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-6183:
--------------------------------
    Attachment: LUCENE-6183.patch

Here's a first stab. I think some of the code can be simplified further, and we should take a pass thru to see if there are any cheap checks we should make.


> 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
>
>
> 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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