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https://issues.apache.org/jira/browse/LUCENE-8590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16709017#comment-16709017
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Simon Willnauer commented on LUCENE-8590:
-----------------------------------------

[~mikemccand] [~shaie] FYI

> Optimize DocValues update datastructures
> ----------------------------------------
>
>                 Key: LUCENE-8590
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8590
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Simon Willnauer
>            Priority: Major
>             Fix For: 7.6, master (8.0)
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Today we are using a LinkedHashMap to buffer doc-values updates in
>     BufferedUpdates. This on the one hand uses an Object based datastructure
>     and on the other requires re-encoding the data into a more compact 
> representation
>     once the BufferedUpdates are frozen. This change uses a more compact 
> represenation
>     for the updates already in the BufferedUpdates in a parallel-array like 
> datastructure
>     that can be reused in FrozenBufferedDeletes. It also adds an much simpler 
> to use
>     API to consume the updates and allows for internal memory optimization 
> for common
>     case updates.



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